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Watlow 945 Series, User Manual

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Appendix

36

WATLOW Series 945 User's Manual

0-5V/4-20mA Input

  

NOTE:

Before calibration on
an installed control,
make sure all data
and parameters are
documented.  See
Setup and Operation
Tables, Pages 18
and 20.

  

IMPORTANT:

When the MANUAL
LED is ON the unit is
automatically
calibrating.  Your
sequence is
VERY important.
Always move to the
next prompt before
changing the
calibration
equipment.

0 - 5 Volt Input Field Calibration Procedure

Equipment Required:

•

Precision voltage source 0-5 volt  minimum range with 0.001 volt resolution.

Setup And Calibration

1.

Connect the AC line voltage L1, L2, and ground to the proper terminals on the 945.

2.

Connect the voltage/current source to Terminal #1 and #3 on the Series 945 terminal
strip.  Use regular 20 - 24 gauge wire.

3.

Apply power to the unit and allow it to warm up for 15 minutes. After warm-up put the
unit in the CAL menu.  See Page 32.  Press the MODE key until OU is displayed.

4.

Press AUTO/MAN twice to enter the MANUAL mode.  The unit is calibrating when the
MANUAL LED is ON.  Make sure the unit is in the MANUAL mode only when you are
in the correct parameters.  See Figure 41.

5.

At the OU parameter, set the voltage/current source to 0.000volts.  Allow at least 10
seconds to stabilize.  Press the MODE key.

6.

At the 5U parameter, set the voltage/current source to 5.000 volts.  Allow at least 10
seconds to stabilize. The unit leaves the CAL mode if 1 minute passes between key
activations.  Press AUTO/MAN twice to exit the MANUAL mode.  To conclude the  0-5
Volt calibration, advance the MODE key to the next prompt or exit the CAL menu.

4-20mA Input Field Calibration Procedure

Equipment Required:

•

Precision current source 0-20mA minimum range with 0.01 mA resolution.

Setup And Calibration

1.

Connect the AC line voltage L1, L2, and ground to the proper terminals on the Series

945.  Jumper for correct line voltage.  See Chapter 2.

2.

Connect the voltage/current source to Terminal #1 and #3.  Jumper Terminal #2 to #3
on the Series 945 terminal strip.  Use regular 20 - 24 gauge wire.

3.

Apply power to the unit and allow it to warm up for 15 minutes. After warm-up put the
unit in the CAL menu.  See Page 32.  Press the MODE key until 4A is displayed.

4.

Press the AUTO/MAN key twice to enter the MANUAL mode.  The unit is calibrating
when the MANUAL LED is ON.  Make sure the unit is in the MANUAL mode only when
you are in the correct parameters.  See Figure 41.

5.

At the 4A parameter, set the mA source to 4.00mA.  Allow at least 10 seconds to
stabilize.  Press the MODE key.

6.

At the 20A parameter, set the voltage/current source to 20.00mA.  Allow at least 10
seconds to stabilize. The unit leaves the CAL mode if 1 minute passes between key
activations.  Press AUTO/MAN twice to exit the MANUAL mode.  To conclude,
advance the MODE key to the next prompt or exit the CAL menu.

Summary of Contents for 945 Series

Page 1: ...1 Bundy Blvd P O Box 5580 Winona Minnesota USA 55987 5580 Phone 507 454 5300 Fax 507 452 4507 0600 0017 0000 Rev A August 1994 Supersedes without change W945 MA40 9432 10 00 Made in the U S A Recycled...

Page 2: ...edback Your comments or suggestions on this manual are wel come please send them to Technical Writer Watlow Controls 1241 Bundy Blvd P O Box 5580 Winona MN 55987 5580 or phone 507 454 5300 The Watlow...

Page 3: ...sensory feedback while the Manual mode has open loop control with user defined output power level The 945 accepts a variety of thermo couples as shown above along with RTD or process input The primar...

Page 4: ...nit Tighten the brackets securely against your panel 4 Insert the control chassis into its case and press the bezel to seat it Turn the front panel screw 90 clockwise CW to lock the control in place I...

Page 5: ...ower Wiring WARNING To avoid potential electric shock use National Electric Code NEC safety practices when wiring and connect ing this unit to a power source and to electrical sensors or peripheral de...

Page 6: ...n with T C and RTD sensor types when using the remote set point input 0 5VDC Process or Remote Set Point Input Input impedance 100K 945A 2 _ _ _ _ 000 945A 3 _ _ _ _ 000 RTD 2 or 3 Wire 945A 2 _ _ _ _...

Page 7: ..._ _ 000 Figure 12 Switched DC Open Collector Figure 13 6 Amp Mechanical Relay NOTE Minimum load resistance is 500 Available current is 22mA maximum Typical voltage drop across a 1K load is 12 to 19 v...

Page 8: ...State Relay With Contact Suppression NOTE This output is supplied with an arc suppression snubber across the output terminals High impedance loads may remain energized even though the output device i...

Page 9: ...state impedance 31M max 945A _ _ K _ _ 000 945A _ _ _ 1 _ 000 Alarm Output Mechanical Relay 6 Amp Single Form A or B For more information on alarms and alarm jumper selection see Chapter 5 Figure 20...

Page 10: ...ring Process 0 5VDC non isolated 25 24 External Load Load impedance 10K min 945A _ _ _ 3 _ 000 945A _ _ _ 4 _ 000 945A _ _ _ 5 _ 000 Figure 25 Retransmit Option 5 Wiring 0 5VDC Retransmit Output Mecha...

Page 11: ...7 T C 8 Not Used 9 T C 10 L1 240V 11 L1 120V 12 L2 13 Earth Ground 14 N O 15 Com 16 Com 17 N O 18 N C Terminal Function Output 1 Output 2 945A 2DD0 A000 945A 2DD0 A000 Rear View 9 7 12 13 11 16 17 L1...

Page 12: ...ra tion A blinking Auto Manual LED indicates that pressing the AUTO MAN key toggles between Auto and Manual After5secondswithoutpress ing the AUTO MAN key the LED stops blinking and re turns to its pr...

Page 13: ...P switch inside the control on the A007 1954 circuit board middle board The location of the board and switches appear below The switches are clearly numbered When Switch 1 is ON the Setup parameters c...

Page 14: ...Variables to transmit Ot4 Output 4 tbS Time base Setup Parameters When you are at the top of the menu the Series 945 displays the user level of operation in the upper display and the LOC parameter in...

Page 15: ...nge low to rH Default Low limit of sensor type Range High Selects the high end of the set point range See the model number and specification information on the inside back cover and Table 1 on Page 16...

Page 16: ...ault Pr Latching 2 Selects whether Alarm 2 is latching or non latching Latching alarms must be cleared before the alarm output will reset Non latching automatically resets the alarm output when the co...

Page 17: ...HYS1 1 F 99 F 1 C 55 C 1U 99U 3 F 0 1 F 9 9 F 0 1 C 5 5 C 0 1U 9 9U Ot2 ht CL or no CL Unit has secondary output HYS2 1 F 99 F 1 C 55 C 1U 99U 3 F Unit has secondary output 0 1 F 9 9 F 0 1 C 5 5 C 0 1...

Page 18: ...al remote Operation Parameters Set Point 1 or Remote Set Point 1 Sets the operating set point for the control outputs Appears if L r L see Page 20 If L r R this parameter represents the remote set poi...

Page 19: ...me value as Ot1 Range 1 to 60 seconds Default 5 Dead Band The area between Output 1 and 2 where no heating or cooling takes place in a heat cool proportional control Only appears if your unit is set u...

Page 20: ...E1 0 00 min Pb2 0 Ot2 Ot1 Ot2 ht or CL Ct1 1 to 60 seconds 5 seconds Pb1 0 Output1 420 Ct2 1 to 60 seconds 5 seconds Pb2 0 Ot2 Ot1 Ot2 ht or CL db 0 99 F 0 55 C 0 99U 0 Ht CL or CL Ht 0 0 9 9 F 0 0 5...

Page 21: ...the Output 1 heat proportional band is set to 0 and the control goes into an ON OFF mode of control at 90 of the established set point The displayed set point remains unchanged The cool output remain...

Page 22: ...tune the Series 945 to your thermal system The tuning settings here are for a broad spectrum of applications your system may have somewhat different requirements NOTE This is a slow procedure taking f...

Page 23: ...st automatic power level If LOC 2 or 3 or the conditions of bumpless transfer have not been met the 945 switches into manual operation at 0 power outputs disabled When transferring from auto to manual...

Page 24: ...closes when an alarm occurs A007 1828 AL1 AL2 N O Contacts Form A N C Contacts Form B Control Chassis Top View Options Board A007 1954 Changing the Position of an Alarm Jumper 1 Remove power from the...

Page 25: ...r HI in the lower display indicates an alarm The lower display alternately shows information from the current parameter and the LO or HI alarm message at one second intervals The alarm output is de en...

Page 26: ...ctioned Enter a valid input The A D value is below the range limits but within the A D conversion limits Make sure the In parameter matches your sensor Er 3 Ambient error Check the specification for t...

Page 27: ...els on a power basis If output values were not stable the control outputs go to 0 power OFF If operator access is LOC 2 or 3 The control remains in AUTO operation and the outputs go OFF AUTO MAN and M...

Page 28: ...arate from input signal lines sensor lines Cross other wiring at 90 angles whenever crossing is unavoidable Look at the system layout identify and locate electrical noise sources such as solenoids rel...

Page 29: ...ie all ground terminals together with one lead usually green wire tied to ground at one point Don t connect ground to the control case if the control is in a grounded enclosure preventing ground loops...

Page 30: ...k for ground loops disconnect the ground wire at the ground termination Measure the resistance from the wire to the point where it was connected The ohmmeter should read a high ohm value If you have a...

Page 31: ...filters or filters with metal cases to metal at ground potential This prevents ground loops and maintains filter effectiveness 1 1 Line Load 2 2 1 1 NOTE Keep filters 12 305 mm or less from the contro...

Page 32: ...the control to go through its auto calibration The calibration menu can only be entered from the LOC parameter in the Setup menu Press the UP DOWN keys simultaneously for 3 seconds 1 second The CAL pa...

Page 33: ...lished and maintained for 5 to 10 seconds the MODE key may then be used to display the next parameter After the final input is established press the MODE key twice to return the unit to the configurat...

Page 34: ...ct the JIS RTD low resistance per model number Connect the JIS RTD high resistance per model number Set the voltage source to 0 000 volts Set the voltage source to 5 000 volts Set the current source t...

Page 35: ...llow 10 seconds to stabilize The unit leaves CAL if 1 minute passes between key activations Press AUTO MAN twice to exit the MANUAL mode To conclude advance to the next prompt or exit the CAL menu Tab...

Page 36: ...source to 5 000 volts Allow at least 10 seconds to stabilize The unit leaves the CAL mode if 1 minute passes between key activations Press AUTO MAN twice to exit the MANUAL mode To conclude the 0 5 V...

Page 37: ...between key activations 8 Use the UP DOWN keys reverse acting to adjust the reading on the multimeter for 5 00V 0 05V for 0 5Volt units and 10 00V 0 05V for 0 10Volt units 9 Press the AUTO MAN key twi...

Page 38: ...Allow at least 10 seconds to stabilize The unit leaves the CAL mode if 1 minute passes between key activations 8 Use the AUTO MAN key twice to exit the MANUAL mode To conclude the 0 5 volt output cali...

Page 39: ...t Also rate Deviation alarm An alarm referenced at a fixed number of degrees plus or minus from set point Glossary A J Default parameters The parameters permanently stored in memory to provide a data...

Page 40: ...switching Action that provides output switch ing only at the zero voltage crossing points of the AC line ON OFF control Control of temperature about a set point by turning the output full ON below set...

Page 41: ...22 23 Mechanical Relay 6 Amp Output 1 Wiring 7 Output 2 Wiring 9 Alarm Wiring 9 MODE key 12 Model Number 43 Mounting 4 N Noise How To Eliminate 29 Sources 28 Suppression Device Ratings 30 Sensitivity...

Page 42: ...ional retransmit of set point or process variable Control outputs User selectable as Heat Heat Heat Heat Cool Cool Cool Cool Cool Heat Outputs independent or related via deadband for Heat Cool ON OFF...

Page 43: ...ne number Ship via Your P O number Symptoms and or special instructions Name and phone number of person returning the material 2 Prior approval and an RMA number from the Customer Service Department i...

Page 44: ...Appendix 44 WATLOW Series 945 User s Manual Watlow Series 945 User s Manual Watlow Controls 1241 Bundy Blvd Winona MN 55987 507 454 5300 Fax 507 452 4507...

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