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Guardian SCC 25, Manual

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Guardian SCC 25 Manual Download Page 37

                                                                                                                                       Page 37

GUARDIAN SCC-40

Issue (Auto VI) & V3.6t 07/12/00

 

CONTROL

COMPRESSOR CONTROL OPERATION

POWER UP

After a power up the controller checks the integrity of the parameters it maintains
in EEROM memory. If this check fails the controller will go to the OFF MANUAL
mode. Otherwise these parameters are used and the controller reverts to its
previous mode.
All timers are reset so that the compressor cannot restart until the time after stop
timer has elapsed (2 mins). This will give the operator sufficient time to change
modes etc. The controller checks for any fault conditions and if any are present
it displays the tripped status, otherwise 

‘WAITING’

 status is displayed

READY/WAITING

After a power reset the waiting status is displayed until the time after stop timer
has elapsed, and the temperature of the oil is greater than the inhibit start  setpoint
as set in 

Filter Temp Low Alarm, 

after which the ready status is displayed.

If an external start/stop refrigeration signal is used then the waiting status is
displayed whilst the stop signal is present.
The controller will allow up to 20 starts per hour. It achieves this by maintaining
a time between starts timer.This timer is reset each time the  compressor is
started. If this timer has not elapsed, after the compressor  has stopped, then the
waiting state will be displayed for the remaining time.
Once the Ready state is indicated the controllers next actions are dependant on
the mode selected:-

  i) MANUAL mode

 - Provided COMPRESSOR is selected the controller will

respond to START being pressed.

 

ii) LOCAL AUTOMATIC

 - The controller looks for the suction pressure to be above

the control band or the external refrigeration signal to go to start.

iii)  REMOTE AUTOMATIC

 - In a pack system of upto six  compressors  the

compressor with the least runtime hours and which is also in the ready state is
considered  to be the Master. Once the control temperature/suction pressure goes
above the control setpoint then the Master compressor will start.

Summary of Contents for SCC 25

Page 1: ...heater and liquid injection control Optional Automatic volumetric slide control Multiple compressor system control Local panel operation and set up Communications for remote monitoring and set up Auto VI Control Operation and Set up Manual GUARDIAN SCC 40 35 30 25 Screw Compressor Controllers provide suction pressure setpoint control and alarm monitoring for one screw compressor Alternatively the ...

Page 2: ...ILABLE UNIT MODELS 13 SCC 40 Input Output Signals 14 SCC 40 Termination Wiring 15 SCC 35 Input Output Signals 16 SCC 35 Termination Wiring 17 SCC 30 Input Output Signals 18 SCC 30 Termination Wiring 19 SCC 25 Input Output Signals 20 SCC 25 Termination Wiring 21 OPERATION 22 SCC40 PANEL LAYOUT 22 LED LAMPS 23 SYSTEM STATUS DISPLAYS 24 SAFETY TRIP INDICATIONS 27 DISPLAY PUSHBUTTON OPERATION 28 view ...

Page 3: ...tion 51 Procedure 52 Auto VI Commissioning Parameters 53 Auto VI Drawing 55 Auto VI Wallbox Wiring 56 TIMER SETPOINTS 57 SETUP 59 Compressor Settings 59 Unit Settings 59 System Settings 60 Port Settings 61 Analog 61 Test 62 Done 62 TWO SPEED MOTOR CONTROL SELECTION 63 TRANSDUCER SETUP CALIBRATION 64 COMMUNICATIONS 67 MAIN SET UP COMMISSIONING PARAMETERS 68 Setup Commissioning Parameters 71 PRESSUR...

Page 4: ...ng functions a All GUARDIAN controllers need to be set up with a unit model selection and other basic settings for setpoints timers and addresses b The shorthand used in the following chapters for concisely expressing button pressing and selection sequences to do all this set up needs to be understood c Mains power input voltage and hardware switch and link option selections if any are required mu...

Page 5: ... CONFIGURATION CHECKS Prior to switching on the GUARDIAN controller check that the hardware unit is the correct type for the incoming mains voltage When satisfied that the correct type of controller is available then the following checks should be made prior to controller installation or replacement a Ensure mains supply is wired correctly to the appropriate TERMINAL WIRING drawing for the model s...

Page 6: ...5 accept Press view to select SETPOINT then press the next button twice to enter the passcode settings Press raise repeatedly until passcode 15 is selected and then press accept Select Unit Model Enter Passcode as button sequence above view SYSTEM SUCTION OIL type SAFETY TRIPS sE tUP DISCHARGE FILTER yEs accept DISCHARGE FILTER DISCHARGE FILTER Unit accept SC30 raise DISCHARGE FILTER SC40 accept P...

Page 7: ... raise Sn65 accept DISCHARGE FILTER next Cn01 accept DISCHARGE FILTER next A 01 raise DISCHARGE FILTER A195 accept next DISCHARGE FILTER donE accept RS485 Communications When the correct system number case compressor number and highway address have been entered as above then the controller can communicate with the GUARDIAN Consultant Terminal PC for central alarm monitoring and temperature display...

Page 8: ...gh Low trips which stop the compressor Trips are indicated by the flashing red TRIPPED lamp and an alternating TRIP message on the appropriate temperature pressure display All measurement values are frozen after detection of a trip condition This facility provides information on the compressor state pressures and temperatures when the trip occurred until after the RESET pushbutton has been pressed...

Page 9: ...play Pushbuttons All pushbuttons are embossed tactile membrane switches start stop raise lower used to control compressors when in manual mode RESET used after a trip to reset the compressor Mode view type used in conjunction with appropriate LED displays to select control display or settings change facilities accept next used in conjunction with raise lower and appropriate LED displays during set...

Page 10: ... in all three modes In MANUAL mode the each compressor may be individually started and stopped and the pack capacity raised and lowered by operator pushbutton control from the local panel In LOCAL automatic mode the compressor is started and stopped under control of the suction pressure setpoint REMOTE automatic mode allows up to six RCC 40 units to be connected via a two wire communication link R...

Page 11: ...e for mounting at the rear of the compressor pack control panel with the display unit mounted on the door and has overall dimensions 300 x 230 x 90mm The unit is fitted with two part screw clamp terminals for the connection of the appropriate input output signals See input output section The GUARDIAN SCC40 control panel comprises a membrane pushbutton and display panel mounted on the front of the ...

Page 12: ...Page 12 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 Consultant Format SCC40 Std ...

Page 13: ...output relays 4 12V dc inputs 5 Mains inputs 8 Trips 2 Analogue outputs 1 Real time clock SCC 35 3 pressures 3 temperatures 7 output relays 4 12V dc inputs 5 Mains inputs 8 Trips 2 Analogue outputs 1 Real time clock SCC 30 3 pressures 2 temperatures 7 output relays 4 12V dc inputs 8 Trips SCC 25 2 pressures 2 temperatures 7 output relays 8 Trips SCC controllers powered at 110V ac are available on ...

Page 14: ...ifferential pressure Filter After Pump Filter differential pressure Filter Before Pump A4 A3 A2 A4 1 to 24 bar g A23 Compressor hours run 0 to 65000 hrs Digital inputs Trip 1 Discharge temperature high dt H Trip 2 L P cutout L P Trip 3 H P cutout H P Trip 4 Oil level LEuL Trip 5 Oil diff flow switch FLO Trip 6 motor circuit breaker nncb Trip 7 Emergency stop StoP Trip 8 Safety motor thermistor SFt...

Page 15: ...6t 07 12 00 SCC 40 Termination Wiring SCC 40 Screw compressor controller N B The Compressor Run Signal TB3 Terminal 11 must be supplied to the Controller from the Delta Contactor of a Star Delta System or the Top of Ramp of a Soft Start System ...

Page 16: ...gital inputs Trip 1 Discharge temperature high dt H Trip 2 L P cutout L P Trip 3 H P cutout H P Trip 4 Oil level LEuL Trip 5 Oil diff flow switch FLO Trip 6 motor circuit breaker nncb Trip 7 Emergency stop StoP Trip 8 Safety motor thermistor SFtY 12 24V dc inputs Input A Slide at 50 max demand unload Input B Optional keyswitch Input C Slide at minimum 0 Input D Slide at maximum 100 Mains inputs In...

Page 17: ...6t 07 12 00 SCC 35 Termination Wiring SCC 35 Screw compressor controller N B The Compressor Run Signal TB3 Terminal 11 must be supplied to the Controller from the Delta Contactor of a Star Delta System or the Top of Ramp of a Soft Start System ...

Page 18: ...A22 Filter Diff Discharge Pressure To Oil Pressure A2 A3 A23 Compressor hours run 0 to 65000 hrs Digital inputs Trip 1 Discharge temperature high dt H Trip 2 L P cutout L P Trip 3 H P cutout H P Trip 4 Oil level LEuL Trip 5 Oil diff flow switch FLO Trip 6 motor circuit breaker nncb Trip 7 Emergency stop StoP Trip 8 Safety motor thermistor SFtY 12 24V dc inputs Input A Slide at 50 max demand unload...

Page 19: ...Page 19 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 SCC 30 Termination Wiring SCC30 Screw compressor controller ...

Page 20: ...24 bar g A21 Not used A22 Not used A23 Compressor hours run 0 to 65000 hrs Digital inputs Trip 1 Discharge temperature high dt H Trip 2 L P cutout L P Trip 3 H P cutout H P Trip 4 Oil level LEuL Trip 5 Oil diff flow switch FLO Trip 6 motor circuit breaker nncb Trip 7 Emergency stop StoP Trip 8 Safety motor thermistor SFtY 12 24V dc inputs Input A Not used Input B Not used Input C Not used Input D ...

Page 21: ...Page 21 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 SCC 25 Termination Wiring SCC25 Screw compressor controller ...

Page 22: ...ton and display panel mounted on the front of the control unit The membrane front panel shown below has a black background with white lettering and green buttons with dimensions 300 x 200mm and houses Number Capacity Motor load windows Status LEDS Suction Discharge Oil Filter windows mode lower stop raise start reset accept next view type ...

Page 23: ...e other alarms which require action LOADING The solenoid loading valve is being pulsed opened to increase the slide capacity UNLOADING The solenoid unloading valve is being pulsed opened to decrease the slide capacity AT MINIMUM The slide is below minimum value 25 or the external minimum setting limit switch is closed AT MAXIMUM The slide is above maximum value 95 or the external maximum setting l...

Page 24: ...cted Press view until SYSTEM is selected The data is displayed in the in the SUCTION DISCHARGE OIL and FILTER windows by pressing next Only displayed if keyswitch ON or passcode 3 Enter System Setup Mode SUCTION OIL SE tUp DISCHARGE FILTER YES Press accept to enter system set up mode Terminate passcode operation SUCTION OIL pASS code DISCHARGE FILTER End Press accept to remove passcode ...

Page 25: ...aring DISCHARGE FILTER stAn dbY Remote mode stopped but ready DISCHARGE FILTER LOC AL Compressor in local mode DISCHARGE FILTER Inhi bit Local mode but inhibited DISCHARGE FILTER nnAN UAL Compressor in manual DISCHARGE FILTER OFF Compressor OFF Relay ouput status SUCTION OIL Out pUtS DISCHARGE FILTER PCEL HrLt Is displayed if relay is OFF p Pump motor ON C Compressor motor ON E Economiser ON L Liq...

Page 26: ...0 E Oil pump running F Compressor running g Refrigeration inhibit H Spare I External reset pushbutton Trip inputs SUCTION OIL tri pS DISCHARGE FILTER 1234 5678 Is displayed if trip input is OFF I Discharge temperature high 2 L P cutout 3 H P cutout 4 Oil level 5 Oil flow switch 6 Motor circuit breaker 7 Emergency stop 8 Safety motor thermistor Analog output voltages SUCTION OIL AO1 AO2 DISCHARGE F...

Page 27: ... T2 L P cutout L P Trip SUCTION T3 H P cutout H P Trip DISCHARGE T4 oil flow switch FLO Trip FILTER T5 oil level LEu Trip OIL T6 motor circuit breaker nncb Trip SUCTION T7 emergency stop stoP Trip DISCHARGE T8 safety trip other sfty Trip OIL STARTING and RUNNING Timeout Trips When detected the following timeout trips alternate the trip messages below with TRIP in the windows specified and flash th...

Page 28: ...e SUCTION DISCHARGE and OIL windows now display the latest measured values of suction discharge and oil temperatures respectively view LATEST VALUE type TEMPERATURE SUCTION OIL 10 DISCHARGE FILTER 70 To display the high alarm settings for pressures the view pushbutton is pressed repeatedly until the HIGH ALARM LED lamp is lit and then the type pushbutton is pressed repeatedly until the PRESSURE LE...

Page 29: ...after any trip fail TIMERS setpoints for stage up and stage down oil diff are displayed in minutes view SETPOINT type TIMERS SUCTION OIL 3 5u 2 3P u stage up 3 5 mins P prelube delay 2 3 mins DISCHARGE FILTER 2 0d 0 0o d stage down 2 0 mins o pump off delay 1 5 mins If no buttons have been pressed for 5 minutes the SUCTION DISCHARGE OIL and FILTER windows revert to the default display of latest pr...

Page 30: ...e and lower buttons provided the compressor is running Mode AUTOMATIC In LOCAL automatic mode the compressor is started and stopped under control of the suction pressure setpoint and an optional external refrigeration allow inhibit signal Operation in this mode is independent of any other compressors in the system REMOTE automatic mode allows up to six SCC 40 units to be connected via a two wire c...

Page 31: ...ing starts and checks the compressor starts the time_between_starts timer and then automatically raises the slide to 25 capacity When the compressor is running at above 25 capacity the STARTING LED lamp is replaced by the RUNNING LED lamp Lower lower may be used in MANUAL mode with the CAPACITY LED lamp selected the compressor RUNNING LED lamp on Whilst lower is being pressed the slide unloading s...

Page 32: ...displayed using view and type selections Changes are made by using the raise and lower pushbuttons to alter the displayed setting which then must be followed by pressing the accept pushbutton Accept accept pushbutton enters new values of setpoints timers alarm or trip settings raise If the raise pushbutton is held on for more than 2 seconds then the value increases automatically at a higher rate L...

Page 33: ...he TRIPPED LED flashes for all trips and the latest values are frozen at the time of the trip for subsequent fault diagnosis When accept is pressed the type LED stops flashing and other display selections may be viewed if required The alarm value continues to alternate with Hi or Lo whilst an alarm is present The tripped value continues to alternate with triP until RESET is pressed view selection ...

Page 34: ... automatically doubled and pulses are sent every five seconds to achieve suction setpoint more rapidly When the setpoint is within 0 3 of the setpoint then the loading valves are pulsed at the variable CAPACITY LOAD DELAY period to give time for plant to respond before sending the next pulse which prevents hunting When the slide capacity is below 75 loading pulses are doubled to counteract the eff...

Page 35: ...Back off unloading occurs due to over current or high discharge pressure After back off the economiser time delay ETxx minutes must elapse before the economiser can be switched on again FILTER TEMPERATURE SETPOINT OIL HEATER OFF Oil heater off setpoint is the oil sump temperature above which the oil heater is switched OFF The oil heater is switched ON when the temperature falls below this setpoint...

Page 36: ... stand alone unit or may be integrated into an overall pack control strategy via the communications link with upto 5 other units The control and monitoring operations are based on the inputs and outputs described previously The controller has three modes of operation i MANUAL Operator required to start stop and control capacity ii LOCAL AUTOMATIC Compressor start stops and controls capacity on suc...

Page 37: ...which the ready status is displayed If an external start stop refrigeration signal is used then the waiting status is displayed whilst the stop signal is present The controller will allow up to 20 starts per hour It achieves this by maintaining a time between starts timer This timer is reset each time the compressor is started If this timer has not elapsed after the compressor has stopped then the...

Page 38: ...tart will proceed as above 3 When the slide does not return to minimum within dt the pump continues to run until the slide is at minimum or the pump pre lube delay is exceeded 4 If the slide is at minimum then the pump is stopped and a motor re start delay time is enforced before a normal starting procedure is attempted This allows excess oil in the compressor to drain away 5 If the slide has not ...

Page 39: ... from starting regardless of suction pressure The status request command also contains the status information of all other compressors This status information consists of i Runtime hours ii Slide position iii Compressor mode requires REMOTE automatic for control iv Compressor State Ready Waiting At minimum At maximum Master Load sharing Over current High Discharge When the suction pressure is abov...

Page 40: ... controllers and then stops transmitting so that the compressor with the next highest priority will take over ii The refrigeration demand decreases In this situation the load sharing compressor will not allow its slide to go below 50 The Master compressor will compensate by continuing to reduce its capacity When the total load of the 2 compressors is 100 for the stage down period then the load sha...

Page 41: ...as required ii Manual to Automatic LOCAL The controller will use suction pressure regulation to automatically adjust the slide to match demand If a start stop refrigeration input is used then if stop is present the compressor will unload to minimum and then stop iii Manual to Automatic REMOTE If this is the only compressor running in REMOTE mode then it will go into suction pressure regulation mod...

Page 42: ... pulse is given during the loading delay until the slide has moved from At Minimum Loading unloading pulses are automatically doubled in width if the suction pressure is more than 0 5 bar from the control setpoint This improves response after changing speeds MANUAL MODE 2 SPEED In manual mode the compressor stops automatically when at maximum is reached in low speed and below Capacity LOW ALARM li...

Page 43: ...nd the motor speed is not decreased any further If the suction pressure is outside 0 5bar of setpoint then the load delay timer is overridden Each time start stop speed 50 has been present for greater than the load delay 3 minutes then the slide capacity is unloaded by a further10 decrement until slide at minimum is present STOPPING If the compressor is at start stop speed with slide at minimum fo...

Page 44: ... low stage controller removes its Stop slave output whenever the low stage pump is started The RESET TRIP RELAY 1 second pulse is issued by the low stage immediately after pump running signal is detected This signal is connected to high stage start slave input which initiates a startup sequence as though the high stage compressor had been started in local suction pressure control Only when both co...

Page 45: ... then the STOP_MASTER signal is given to the low stage and the high stage motor relay output is immediately removed which de energises the motor contactor The low stage shuts down in a normal stopping sequence The high stage indicates the trip condition and lights its Tripped lamp HIGH STAGE STOP REQUEST When a high stage Manual Stop request is given then the high stage compressor goes into its st...

Page 46: ...ched on when the motor is stopped and the appropriate oil sump temperature is below the low alarm limit 25 C provided neither a low oil level or any other safety trip is present The oil heaters are switched off when the motor is running EVAPORATOR VALVE The Low stage LS U controller provides an analogue output signal 0 to 10vdc which is proportional to the Low stage slide position 0 to 100 This si...

Page 47: ...energised compressor 2 input outputs connected to SCC controller compressor 2 automatically starts and runs some time later compressor 2 trips flashing trip lamp delay after stop timer started when delay complete automatically reset trip VI 1 relay de energised compressor 1 input outputs connected to SCC controller compressor 1 automatically starts and runs etc If more than 6 trips occur in a 24 h...

Page 48: ...is set to VI minimum Above the Initial VI setting the VI slide is adjusted for the corresponding pressure ratio Part Load operation When the Capacity slide meets the VI slide the compressor is in Full Load mode and the At Maximum indication is set In Full Load mode and the suction pressure is at or above the setpoint if the VI is decreasing the Capacity slide is moved first as this is able to push...

Page 49: ...uP Select Slide up pulses VI slide to maximum in about 2 minutes b Select Ssdn Select Slide down pulses VI slide to minimum in about 2 minutes 8 Start compressor When the slide capacity is above Initial VI setting inxx the auto VI slide is controlled dependent on the difference between suction and discharge pressure The greater the difference the higher the VI ratio 2 6 to 5 0 9 The VI ratio curre...

Page 50: ...data sheets See attached data sheet for Guardian defaults mm U U000 U255 Initial VI Setting Capacity slide percentage at which auto variable VI is applied See attached data sheet for Guardian defaults in in45 in99 Period Auto VI is applied Adjustable in 0 1 minute steps ie 6 seconds Dependant on application Recommend starting at 0 5 30 seconds and observe system response If too erratic increase ti...

Page 51: ...Page 51 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 Auto VI Drawing ...

Page 52: ...Page 52 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 Auto VI Wallbox Wiring ...

Page 53: ... N B To exit none setting Discharge Timer Setpoint Lower Accept Pre Lubrication p OIL 0 0 to 5 0min Oil pump run before compressor starts At minimum signal must be present at the end of this timer or a S UP trip is displayed before the motor is started On a siphon system this timer is restarted with the motor and inhibits LOW oil differential pressure alarms and trips whilst it is still active Pum...

Page 54: ...r determines the delay before allowing the Economiser to switch on again after a load reduction back off Loading pulse Width Loading pulse At maximum LP LPSt LPPu 0 to 50 0 to 50 of the 5 second raise lower period The value is change using System Setup mode This width is automatically doubled if the suction pressure is more then 0 5 bar above setpoint Loading pulses stopped No further Pulses Loadi...

Page 55: ...motor LS U Low side unit dual compressor 1 motor Vibr P5 is 4 20mA vibration 0 100 with trips tcon Control on equivalent temperature CHIL Control on water chiller temperature T5 rt5c Control on glycol chiller temperature T5 rP5c Control on Remote Pressure P5 Multi compressor control priority YYYY YYYY runH Priority run on hours LEAD Priority always highest LAg Priority always lowest StbY Only run ...

Page 56: ... P St P ST Pump Start Compressor no P no P No Pump Compressor FiLt FiLt Special Contact Guardian Oil Differential alarm trip delay dtnn nn 0 to 9 9 minutes Bypass delay if bY_P btnn nn 0 to 99 seconds If 2Fan bFnn nn 0 5 to 9 9 Bar Additional cut in above setpoint of Fan1 in Discharge Pressure Setpoint NOT USED Lbnn Economiser back off retry time Etnn nn 0 to 99 minutes Motor start speed if Invert...

Page 57: ...a 9600 Baud rate and Port Settings is not used SUCTION OIL SE tUp Press next to sequence through Setup selections DISCHARGE FILTER Press raise or lower to change settings Port Press accept to accept settings Baud rate YYYY YYYY 9600 Baud rate settings for RS485 highway 4800 communications 2400 1200 Analog SUCTION OIL SE tUp Press next to sequence through Setup selections DISCHARGE FILTER Press rai...

Page 58: ...ccept to toggle relay states Relay R1 1OFF 1 on Relay R2 2OFF 2 on Relay R3 3OFF 3 on etc Relay R9 9OFF 9 on Alarm relay AOFF A on LED 1 OFF ON etc LED 8 OFF ON Tripped relay tOFF t on Analog output calibartion Ao 0 Ao10 Ao05 Done SUCTION OIL SE tUp DISCHARGE FILTER done Exit settings change and return to default compressor display press accept ...

Page 59: ...ew SYSTEM SUCTION OIL type SAFETY TRIPS sE tUP DISCHARGE FILTER yEs accept DISCHARGE FILTER Unit next DISCHARGE FILTER DISCHARGE FILTER SYSt accept Lpnn next DISCHARGE FILTER DISCHARGE FILTER UPnn next nosP next DISCHARGE FILTER r22 next DISCHARGE FILTER noUi raise or lower DISCHARGE FILTER 2 sp accept RESET Two speed motor operation has been selected Two speed operation may be removed by selectin...

Page 60: ...next DISCHARGE FILTER C nn nn is slide voltage range 0 10V dc C scale C 05 0 5V dc C 41 is a slide giving only 4 1 volts due to line losses instead of 5 0 volts C100 is 4 20mA slide input selection Also for 4 20mA Fit Link LKV2 adjacent TB7 next DISCHARGE FILTER tnnn nnn is the current transformer rating T size eg for a CT of 300 5 then nnn 300 next DISCHARGE FILTER rnnn nnn is the maximum rated m...

Page 61: ...rated at site Before attempting Pressure Calibration please contact Guardian Electronics Ltd Pressure transducers are set for a range of 1 to 24 Barg 0 25 Bara 4mA 1 Barg 17 44mA 20 Barg CAUTION Do not press the accept button if during calibration the display reads 1 3Barg as this is an out of range setting and will result in a permanent loss of calibration Select view SYSTEM type PRESSURE With th...

Page 62: ...pacity is then deduced from the state of the slide position microswitches for 0 50 100 IF a 4 20mA slide transmitter is used then the slide input should have Link LKV2 adjacent TB7 fitted with the shorting links supplied setup selection is SEtuP AnAL C_term C100 for 4 20mA MOTOR LOAD SETUP IF a 300 5 current transformer is used then SEtuP AnAL tnnn t300 press raise or lower until current transform...

Page 63: ...oller has a unique unit number address UU u which is used to select the appropriate unit for interrogation or modification UU is system no 1 80 u is compressor number 1 6 i e compressor 3 system 56 has address 56 3 Some communication commands may use wildcard stub number 99 and wildcard case number 9 to access all stubs on the highway or all cases in a stub GUARDIAN controllers are inactive until ...

Page 64: ... SAFETY TRIPS SUCTION OIL sE tUP DISCHARGE FILTER yEs accept Unit units Actual setting Default setting Min Max Model type SC40 SC35 SC30 SC25 SC SC SC Remote control mode runH LEAd LAg StbY runH StbY Control type Std HS U LS U Uibr tcon CHIL rt5c rP5c Std rP5c System pack number Sn Sn01 Sn80 Compressor number Cn Cn01 Cn06 Monitor Address A A 01 A255 rtc Real Time Clock Hrs rh rh00 rh24 Real Time C...

Page 65: ...Oil P3 to Suction P1 no P No Pump Compressor Oil Differential Oil P3 to Suction P1 FiLt Special Contact Guardian PunP FiLt Oil differential trip delay secs dt dt00 dt99 IF bY P Bypass delay time On 4secs before comp starts On at compressor STOP output VI 2 RL9 secs bt bt05 bt99 IF 2Fan Fan 2 additional cut in above setpoint bar bF bF0 5 bF9 9 NOT USED Lb Lb1 0 Lb9 9 Economiser retry after back off...

Page 66: ...ue Set up Pressure transducer type P 00 0 100mV P 04 4 20mA P P 00 P255 Slide scale 0 none 5 standard C100 is 4 20mA slide input selection Also for 4 20mA Fit Link LKV2 adjacent TB7 C C 00 C100 Load transformer current rating ratio txxx 5 Amp t t000 t990 Motor maximum current rating rxxx Amp r t000 t990 ...

Page 67: ...ring Compressors Minimum slide at which a load sharing compressor is allowed before it auto stops after stage down time Load Sharing OFF When set to 0 0 80 SUCTION PRESSURE HIGH ALARM hi alarm suction pressure bar 0 0b 20 0b DISCHARGE PRESSURE HIGH ALARM hi alarm disc pressure unload bar 0 0b 23 0b CAPACITY PRESSURE HIGH ALARM Maximum slide capacity above which the compressor inhibits loading puls...

Page 68: ...s unit Actual Setting Default Setting Min Max SUCTION EQUIV SETPOINT IF tcon Suction equivalent temp setpoint C 50 50 FILTER EQUIV SETPOINT IF CHIL Water chiller temp setpoint C 1 0 24 0 rt5c Remote Temperature 5 Control FILTER EQUIV SETPOINT IF rt5c Glycol Temperature Control Setpoint C 37 30 FILTER EQUIV LOW ALARM IF rt5c Glycol temperature Low Alarm C 47 50 FILTER EQUIV HIGH ALARM IF rt5c Glyco...

Page 69: ...erheat Suction actual temp T1 suction equivalent temp P1 C 05c 100c FILTER DIFF HIGH ALARM High Alarm Filter Differential IF PUMP FStd Selected Filter Inlet Press4 Manifold oil pressure Press3 IF PUMP Fdis Selected Filter inlet Press2 Discharge Oil Pump inlet Press4 If No P FStd SCC30 35 Filter inlet Press P2 Oil Press P3 After FIXED 2min timer bar 0 20 0 SUCTION DIFF LOW TRIP Low trip suction sup...

Page 70: ... down delay time minimum load or 50 if in slide balance mode before stopping Set at 10 0 none NO STOP AT MINIMUM MANUAL STOP ONLY N B To exit none setting Discharge Timer Setpoint Lower Accept d mins 0 1d 10 0d none OIL TIMERS SETPOINT pump pre lube delay pump run time before compressor starts p mins 0 2P 5 0P FILTER TIMERS SETPOINT pump delay after compressor stops until at minimum received o min...

Page 71: ...con on Stop load view SETPOINTS type SUCTION DISCHARGE OIL FILTER CAPACITY LOAD PRESSURE Control Fans TEMPERATURE LIQ INJ on EQUIV TEMP Control Chiller DIFFERENTIAL stop pump HOURS RUN TIMERS mins stage up stage down pre lub pump off pre load after stop SAFETY TRIPS view LOW ALARM type SUCTION DISCHARGE OIL FILTER CAPACITY LOAD PRESSURE stop yes TEMPERATURE pump inh min load EQUIV TEMP yes DIFFERE...

Page 72: ...es yes HOURS RUN TIMERS mins SAFETY TRIPS view HIGH TRIP type SUCTION DISCHARGE OIL FILTER CAPACITY LOAD PRESSURE yes yes TEMPERATURE yes yes EQUIV TEMP yes DIFFERENTIAL yes yes HOURS RUN TIMERS mins SAFETY TRIPS view SYSTEM type SUCTION DISCHARGE OIL FILTER CAPACITY LOAD PRESSURE cal A1 cal A2 cal A3 cal A4 cal A9 cal A10 TEMPERATURE EQUIV TEMP DIFFERENTIAL HOURS RUN TIMERS mins SAFETY TRIPS SYST...

Page 73: ...Page 73 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 SCC 40 Enclosure wiring for trips negative ...

Page 74: ...Page 74 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 SCC 40 Enclosure wiring for trips positive ...

Page 75: ...Page 75 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 Local Communications Internal Communications between Compressors ...

Page 76: ...Page 76 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 Standard Wallbox Internal wiring ...

Page 77: ...Page 77 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 Standard SCC 40 Drawing ...

Page 78: ...Page 78 GUARDIAN SCC 40 Issue Auto VI V3 6t 07 12 00 FITTING NEW EPROM NOTE POSITION BEFORE REMOVAL ACTUAL LOCATION MAY BE REVERSED CORRECT POSITIONING OF EPROM ALIGN INDICATED INDENTS ...

Page 79: ...MANUAL 30 MODES CHANGES 41 42 44 MOTOR LOAD SETUP 62 next 32 OPERATION 22 OVERVIEW 8 Port Settings 57 POWER UP 37 PRESSURE TRANSDUCER SETUP 61 Pushbuttons 9 raise 32 Raise 31 RCC40 PANEL LAYOUT 22 Relay ouput status 25 REMOTE AUTOMATIC 36 RESET 30 RS485 Communications 7 RUNNING 37 38 SAFETY TRIP INDICATIONS 27 SCC 25 Input Output Signals 20 SCC 25 Termination Wiring 21 SCC 30 Input Output Signals ...

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