Electrical Test Instruments MAC-20 Instruction Manual Download Page 23 | Manualshive

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Summary of Contents for MAC-20

Page 1: ...er Gnntralter MRG 2 T Circuit Breaker Test Set Retrofit Package lnstruction Manual itlarih tr l9r r9 Electrical Test Instruments Irlc 525 Old Westminster Pike Suite M Westminster MD 21157 410 816 4641 Fax 41G 848 0181 ...

Page 2: ...fit lndicator Panel Figure ll 2 Retrofit lndicator Panel SECTION lll OPERATING INSTRUCTIONS Pre Test lnstallation and Setup Basic Guidelines and Suggestions Single Pole Molded Case Breakers Multi pole Molded Case Breakers Low Voltage Power Breakers Motor Overload Relays Ratioing Current Transformers SECTION lV SERVICE INFORMATION AND DOCUMENTATION Maintenance and Calibration of MAC 20 Parts List M...

Page 3: ...leclrical Test lnstruments MAC 20 Retrofit Package Section I General lnformation and Specifications sEcTtoN I GENERAL INFORMATION Copyright C 1994 1998 Electrical Test lnstruments lnc All Rights Reserved ...

Page 4: ...H THE UNIT OPEMTION PRIOR TO CONNECTING THE UNIT TO A SOURCE OF POWER HIGH CURRENT TEST SETS ARE NORMALLY POWERED FROM HIGH CAPACITY 208 VOLT TO 575 VOLT SERVICES AND IMPROPER CONNECTION OR OPERATION COULD CAUSE DAMAGE TO THE TEST SET AND EQUIPMENT UNDER TEST AS WELL AS CREATE AN UNSAFE CONDITION FOR PERSONS OPEMTING THE SET Electric l Test lnstruments lnc Page l 1 Copyright C 1 994 1 998 All Righ...

Page 5: ...st retrofits a new indicator control panel has been installed ln either case the control panel allows operation of the test set without the MAC 20 if necessary The control panel also provides test output ON OFF indicators interlock indicators and a power on indicator Test sets which are controlled by a microprocessor or computer such as the EIL PS 250 and PS 600 or the Phenix Technologies HC 30 an...

Page 6: ...tic evaluation of output current pulses as short as one half cycle The MAC 20 incorporates a precision A D converter and special firmware for true RMS continuous and pulse current reading with much greater accuracy lt also utilizes a sophisticated current sensing system for more reliable current latch mode operation and better timing accuracy An LED digital readout for current in four ranges from ...

Page 7: ... 5 Full Scale 1 Digit Continuous 1 0 Reading 1 0 Full Scale 1 Digit Pulse 0 0 l sec TIMER RANGES 0 9 999 0 99 99 0 999 9 0 9999 Seconds 0 999 9 0 9999 Cycles TIMER ACCURACY 0 005 sec l 0 005 of reading 1 count DIMENSIONS AND NET WEIGHT Height 7 0 in 178 mm Width 19 0 in 483 mm Depth 6 0 in 152 mm Weight 10 b 4 55 kg STANDARD ACCESSORIES Power cable 1 Remote Control cable I Electrical Test lnstrume...

Page 8: ...Electncal Test tnstruments MAC 20 Retrofit Package Section lll Detailed Description sEcTtoN il DETAILED DESCRIPTION Copyright C 1994 1998 Electricat Test lnstruments tnc Alt Rights Reserved ...

Page 9: ...echanical contactor an AC controlled solid state relay with zero crossing detection is often used to energize the main contactor This provides some consistency of output waveform since the contactor will always pull in at some fixed time after the zero crossing and hopefully not at a multiple of a half cycle This tends to minimize the DC offset which results when an inductive load is energized at ...

Page 10: ... have limited alphanumeric capability for more flexible indication of such conditions as overrange The keys are scanned at roughly 30 times per second and incorporate LED s to indicate status An audible indicator beeper sounds when a key is pressed The contact sensing circuit ry uses the key scanning system with a transformer for isolation The sensing signal is a repetitive pulse of low voltage an...

Page 11: ...s connected across the 120 VAC high and low circuits and should light whenever power is applied to the test set and the main power switch or circuit breaker is turned on The OUTPUT ON lamp indicates that the SCR or contactor is energized The INTERLOCK lamp indicates that the interlock circuit is open This may occur when an interlock switch on an access door is open the push to turn tap switch is e...

Page 12: ...ons such as interlocks could keep the output from actually turning on ln MOMENTARy mode the key must be held to keep output current on if LATCH is enabled the output will stay on until the breaker trips or the STOP or RESET button are pressed The MAC 20 must be RESET in order to initiate output and in N C or N O contact modes the contact status continuity must indicate that the breaker is closed l...

Page 13: ...curacy in this mode is typically 0 01 seconds C L key combination When the N O and N C keys are pressed simultaneously both LEDs light indicating C L mode Cunent Latch This is the normal power up default mode for the test set and is recommended for all tests unless there is a good reason for using contacts to sense trip ln this mode current is continuously sampled and when it exceeds approximately...

Page 14: ...ovides best accuracy of readings up to about 1000 amperes Nominal currents close to this limit when applied to the device under test will sometimes cause higher peak currents causing the display to read OVER indicating an overrange condition lf this happens select the next higher range Pressing any range switch will also RESET the MAC 20 5 KA range key This key selects the 5 000 KA range for outpu...

Page 15: ...supply and support circuitry for the microprocessor core module and programmable peripheral interfaces for the analog board and keyboard display board lt also supplies regulated 5 VDC for the keyboard display board MICROPROCESSOR CORE MODULE This small PC board manufactured by ZWorld Engineering and called the SmartCore contains a Zilog Z 180 microprocessor crystal controlled clock support circuit...

Page 16: ...e Section ll Detailed Description Figure ll 2 MAC 20 Front Panel NE J HHr H 5j mEt iFr r V A NEE I cuRRENr I m MMFHH rffi fi l Monitor Ammeter Controller Model MAC 20 Electrical Test lnstruments lnc Page ll 8 Copyright C 1 994 1 998 All Rights Reserved ...

Page 17: ...pproximately TTL logic level compatible POWER ON indicator This amber neon lamp lights when power is applied to the test set OUTPUT ON indicator This red neon lamp lights when the SCR firing circuit is energized indicating that the output should be ON INTERLOCK ON indicator This red neon lamp lights when one of the test set interlccks are ON which inhibits output initiation Figure ll 2 Retrofit ln...

Page 18: ...Eleclrical Tesl lnstruments MAC 20 Retrofit Package Section lll Operating lnstructions sEcTtoN ilt OPERATING INSTRUCTIONS Copyright C 1994 1998 Electrical Test lnstruments lnc All Rights Reserved ...

Page 19: ...urve data c Test log and or report forms See examples at end of section d Basic hand tools wrench screwdriver etc e Safety equipment safety glasses gloves etc f Reliable and sufficient power source g Clean spacious and well lit work area 3 The MAC 20 which may be transported separately must be installed as follows a lnspect the interior of the Main Control Unit or Panel Fnclosure through the 19 in...

Page 20: ...power source to input of Main Control Unit using connectors supplied 13 lf Remote lnitiate Cable will be used install NOW before power is turned on 14 Turn on power at source if turned off in step 11 above 15 Connect breaker under test to appropriate output tap using stabs or cables as required 16 Make sure that breaker is CLOSED 17 Turn Main Power Switch Circuit Breaker ON 18 lf everything is OK ...

Page 21: ...t Tap switch and Vernier to their lowest positions before energizing the test set 5 Always choose an ammeter range that allows the test current to be read in the area from 20o o to 8O o of the maximum This provides greatest accuracy of read ings least chance of overrange and optimum current latch operation 6 To obtain maximum output current from the test set especially when using output cables it ...

Page 22: ...s obtained at maximum position of the vernier set the OUTPUT TAP control to the next higher tap return the vernier to zero and continue 10 Press RESET button 1 1 Set TIMEBASE to SECONDS 12 Select LATCH mode 13 Press and release INITIATE key CLOSE or OUTPUT ON light should glow timer should run and current display should read desired output current 14 While test is running observe current reading l...

Page 23: ...n to return to normal mode 8 Select MEMORY mode 9 Repeatedly jog the INITIATE button while adjusting the OUTPUT CONTROL higher until the circuit breaker trips instanta neously This is the approximate pickup point lf insufficient current is obtained at maximum position of the vernier set the OUTPUT TAP control to the next higher tap return the vernier to zero and con tinue 10 Close breaker under te...

Page 24: ... multiple of rating 3 Close breaker under test 4 Press the INITIATE button Breaker should trip 5 Read and record timer and ammeter readings current 6 Shut down test set disconnect breaker and prepare for subsequent testing or relocation according to steps 20 through 25 in general procedures outlined above Electrical Test lnstruments lnc Page lll 6 insta nta n eous ly as instantaneous trip time and...

Page 25: ...gher tap return the vernier to zero and continue 11 Press RESET button 12 Set TIMEBASE to SECONDS 13 Select LATCH mode 14 lf desired N C mode may be used connect contacts leads to an unused pole of the breaker 15 Press and release INITIATE key CLOSE or OUTPUT ON light should glow timer should run and current display should read desired output current 16 While test is running observe current readin...

Page 26: ...y This is the approximate pickup point lf insufficient current is obtained at maximum position of the vernier set the OUTPUT TAP control to the next higher tap return the vernier to zero and con tinue 10 Close breaker under test 11 By repeating the test determine the MINIMUM SETTING of the OUTPUT CONTROL at which the breaker under test opens immediately whenever the INITIATE button is depressed 12...

Page 27: ...t the above test for the other poles of the circuit breaker 7 Shut down test set disconnect breaker and prepare for subsequent testing or relocation according to steps 20 through 25 in general procedures outlined above Copyright C 1994 1 998 All Rights Reserved Electrical Test lnstruments lnc Page lll 9 ...

Page 28: ... T D setting ln both cases tripping time should be within the manufacturer s published time range Pick up of the instantaneous unit should be l 10o o of the setting for the electronic device and l 20 of the setting for the magnetic device Testing the instantaneous trip on very large circuit breakers set at or near maximum calibration may sometimes exceed the capacity of the test set ln most cases ...

Page 29: ...ps the test set output should de energize timer should stop CLOSE or OUTPUT ON light should turn off and TRIP or OUTPUT OFF light should glow lf applicable 18 Read and record trip current and trip time Compare to manufacturer s time current curve lf necessary adjust the trip unit and repeat the test 19 Repeat the above tests for the other poles of the breaker allowing time for breaker to cool Note...

Page 30: ... to manufacturefs time current curve lf necessary adjust the trip unit and repeat the test 10 Repeat the above tests for the other poles of the breaker allowing time for breaker to cool Note Results are acceptable if all poles of the breaker trip within the manufacturer s time range for the value of test current chosen All poles of the breaker need not trip in exactly the same amount of time 1 1 S...

Page 31: ...e breaker 13 Repeat the above test for the other poles of the circuit breaker 14 lf trip settings were modified for test purposes restore them to their original values 15 Shut down test set disconnect breaker and prepare for subsequent testing or relocation according to steps 20 through 25 in general procedures outlined above lnstantaneous TriP Time Test 1 Perform lnstantaneous Pickup Test as outl...

Page 32: ...ater 2 Follow steps 1 through 18 in general test procedures as required to set up the breaker test set 3 Setup MAC 20 for C L MOM 4 Set MAC 20 RANGE to lowest range that is greater than desired test current 5 Set TIMEBASE to CYCLES 6 Press PRESET key Adjust preset time to 6 0 cycles 7 Press PRESET again to return to normal mode 8 Select MEMORY mode 9 Connect the relay operating coil or heater circ...

Page 33: ...o replace the relay heater with one of the recommended size for the motor being protected lf a check test is desired the relay must be allowed to cool for a period of time approximately 15 to 30 minutes 17 For a multi pole relay repeat the above tests for the other relay poles 18 Shut down test set disconnect breaker and prepare for subsequent testing or relocation according to steps 20 through 25...

Page 34: ...neral test procedures as required to set up the breaker test set connect the current transformer primary terminals to the breaker test set common terminal and the proper output tap terminai Connect the current transformer secondary terminals to the bench ammeter Set the MAC 20 to N O mode Set LATCH on Press and release INITIATE button CLOSE or OUTPUT ON tight shoutd glow timer should operate and c...

Page 35: ...Test lnstruments MAC 20 Retrofit package Section lV Service lnformation and Documentation SECTION IV SERVICE INFORMATION AND DOCUMENTATION copyright c 1994 1997 Erectric rrest rnstruments rnc AI Rights Reserved ...

Page 36: ... to shock and vibration The standard rack mount hardware and twist lock connector make it simple to remove the MAC 20 and carry it separately Suggested periodic maintenance consists of the following 1 Clean the lenses of the LED displays with a plastic cleaner 2 Clean the front panel with a soft brush and cloth 3 Perform basic field operational check as described below Field calibration of the MAC...

Page 37: ...press RESET key 10 Raise the current slowly until the timer begins to run This is the current Latch Threshold which should be about 5 of full scale range 11 Set the current at 50 of full scale 500 A and stop the current 12 Set the MAC 20 to MEMORY mode and press the RESET Switch 13 lnitiate a fast momentary pulse of no more than 6 cycles 0 1 sec duration The meter should read the same value within...

Page 38: ...tNc KBDSP 12 1 PC Board ZlB0llo ET tNc z180to 13 1 PC Board Analoq siqnal orocessinq ET lNc ORTIV3PCB l 2 Ribbon Cable Ass v ET tNc PARTS LIST Retrofit Panel The overall schematic is on the following pages The parts list is provided below Please refer to both when ordering replacement parts ITEM OTY DESCRIPTION VENDOR Part Number 1 1 Panel 5 25 ET rNc 2 I Terminal Block 8 oosition Beau 21008 3 1 T...

Page 39: ...storage or to other than normal use or service This limited warranty does not cover reimbursements for transportation removal installation repair or replacement except as may othenruise be specifically agreed to in writing by Electrical Test Instruments Ihe foregoing is in lieu of all other warranties expressed or implied and all other obligations or liabilities whether arising under contract negl...

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