Current Overload Trip

[Meer Abdulrehma]

Hi all
Have a problem occuring on site which read current overload we initialy thought the problem was due to power from the power generating company, but we tried it with generator power and the problem still arises. the setting on the UCM on the current overload settings the set configuration is 26 for 415 volts 50hz 3phase and compressor CHHN060 and running current on the compressor is 72Amps. any info will be helpfull. thanks

[mehen]

Are you working with inverters?
If so, the overcurrent is due to refrigerant overcharge.
best of luck...

[Meer Abdulrehma]

No inverters being used the model of the unit is TRTAB 212

[goshen]

No inverters being used the model of the unit is TRTAB 212

hi meer :
current o.l couid be because of many reasons hi head pressure,, bad current transformers, bad contactor ,loose connection ,bad settings ,.
u should check the unit when runnig ,i assume that after a serious inspection of these parameters u should be able to pinpoint your source of problem.
good luck let us know how it went.

[Brian_UK]

If overload is at 26amps and compressor is running at 72amps then I wouldn't blame the overload.

What should eb correct/normal running current be?

[Magoo]

If a six wire motor and overlaod monitoring one set of leads the overload should be set at half motor rated full load amps, ie 72amps FLA motor, o/load 26 amps.
Check current draw with clip on ammeter.

[goshen]

If overload is at 26amps and compressor is running at 72amps then I wouldn't blame the overload.

What should eb correct/normal running current be?

this is a bad copy of the trane manual for setting ol on ucm controller 26 is a code not a current reading !!!!!
as i said their must be another problem causingthis alarm

§5 CURRENT OVERLOAD

REFRIGERANT R22 - R404a
COMPRESSOR
CHHN 35 CHHN 40 CHHN 50 CHHN 60 ICHHB70 CHHB 85 CHHB 100
RLA (A) 63 71 84 102 123 141 165
380/50/3 CT ext. 10 10 01 01 02 02 03
Dip switch 10011 11100 10011 11111 10001 11011 10010
UCM confi 19 28 19 31 17 27 18
RLA (A) 60 68 80 97 117 134 157
400/50/3 CT ext. 10 10 01 01 02 02 03
Dip switch 01111 11001 01111 11101 01101 11000 01110
UCM confi 15 25 15 29 13 24 14
RLA (A) 58 66 77 93 113 129 151
415/50/3 CT ext. 10 10 01 01 02 02 03
Dip switch 01101 10110 01100 11010 01011 10101 01011
UCM confi 13 22 12 26 11 21 11
RLA (A) 109 124 145 176 213 244 285
220/50/3 CT ext. 02 02 02 03 04 04 05
Dip switch 01000 10010 11101 10110 01101 11110 00111
UCM confi 08 18 29 22 13 30 07

[Meer Abdulrehma]

Hi Guys

thanks for all your responses and concern have managed to solve the problem which ended up being the solenoid valves we have replaced and problem was solved.