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kifayat
05-07-2009, 07:42 AM
Hi I have A York Chiller Liquid Screw Type:

After starting when converting in delta the machine trip and on diplay status giving error star delat transit fault.after resting machine start agian after this process chiller agin trip what is the troublshooting point how to indentify the fault
and why phase sequence meter is used in chiller?
thanks
nike123
05-07-2009, 08:41 AM
Did someone else done some repairs on chiller before you arrived?
Yuri B.
05-07-2009, 08:55 AM
Screw compressors need right phase sequence, therefore all decent machines are provided with a relay that controls supply.
Check:

motor's windings' continuity,

fuses,

voltages, phase sequences everywhere,

whether all power commutations have been done right - in motor's contact box, and on contactors,

check whether all contacts close,
whether contactors'coils are good: simply take off leads to motor, switch on, and test how they close.

Also, maybe the supply is poor and voltage at start drops too low.
al
05-07-2009, 12:17 PM
it could just be an auxillary relay not making, also the auxillaries on older models were well known for "bouncing" which breaks the circuit for a split second and trips the chiller.

al
Yuri B.
05-07-2009, 12:36 PM
Hopefully the test with motor leads off will evince it.
kifayat
07-07-2009, 04:14 PM
After emoving the fault star-delta trasit fault a new fault arises
in status--------EMS/MP CUT OUT
fault
whats its mean?
kifayat
07-07-2009, 04:29 PM
cONTROL CIRCUIT DIAGRAME AND CIRCUIT DIAGRAME NEDEED

MILLINIUM YORK LIQUID CHILLING SYSTEM
MODEL NO YCW S80SC50C
RATED CAPICITY 253KW
DESGIN PRESSURE FOR SYSTEM 2.5 MPA
REFREGERANT R22
VOLTS -PHASE -HZ 390- 3 - 50
Md.Anis Mondol
10-07-2009, 07:15 AM
Good afternoon,I am glad for your member.

York chiller
Model:YK EB EB H5 5C OE.
Fault : Oil Low differential pressure.

Work: After maintenance we are try to run this chiller but when switching then (after 50 seconds) showing above fault.

Also showing in Oil Sump parameter:-
oil pressure 115 kpaD
oil sump temperature 50 deg. cel.
pump oil pressure (HOP) 565 kpaD
sump oil pressure (LOP) 513 kpaD.

Please help us.

Thanking you
Anis.
kifayat
11-07-2009, 02:55 PM
After emoving the fault star-delta trasit fault a new fault arises
in status--------EMS/MP CUT OUT
fault
whats its mean?

plz also cONTROL CIRCUIT DIAGRAME AND CIRCUIT DIAGRAME NEDEED

MILLINIUM YORK LIQUID CHILLING SYSTEM
MODEL NO YCW S80SC50C
RATED CAPICITY 253KW
DESGIN PRESSURE FOR SYSTEM 2.5 MPA
REFREGERANT R22
VOLTS -PHASE -HZ 390- 3 - 50