Telemark Cryogenics 1200 Instruction Manual page 56

Status LED Status LED Description
Green Alert Module supply voltage
LED present.
Solid Compressor running OK
Green Alert Short Cycling.
LED Compressor power on/off
3 Flashes too many times
Open Circuit
Green Alert
Demand signal is present
LED
but no compressor
5 Flashes
current for four (4) hours
Welded Contactor.
No demand signal, but
Green Alert current has been
LED detected in one or all of
8 Flashes the 3 phases. This is
displayed for 24 hours
after last detection
Green Alert Discharge Temperature
LED Sensor Error. Short or
11 Flashes open circuit detected.
Green Alert
Current Transducer (CT)
LED
error
12 Flashes
Yellow Alert Trip
LED Demand Present but no
Solid current detected.
Telemark Cryogenics Microprocessor Based Cryochillers
The CoreSense™ module will continue to display the code
until the fault condition has been rectified and or manual
power reset (unit Powered off) has been carried out. More
than one LED can be illuminated depending upon the fault.
The CoreSense™ LED's will flash at about one every second
with a three second pause in between the each flashing
cycle. (i.e. x number of flashes followed by a pause).
Status LED Troubleshooting
Information
Page 56 of 63
1. Supply voltage present.
2. Compressor Running OK
1. Check pressure or temperature
control.
2. Possible loss of refrigerant.
3. Condenser fail.
1. Compressor Thermal Overload
trip.
2. Compressor Contactor Failed.
3. Open Circuit in compressor
supply wiring.
4. Compressor Windings
Damaged.
1. Contactor welded closed.
2. Thermostat demand signal not
connected to module. Verify the
wiring form the thermostat to
module.
1. Check discharge Temperature
sensor wiring and mounting.
2. Check for open or short circuit.
(Resistance 86 k @ 77° F
(25° C).
3. Check CT module plugged into
module.
4. Check for short circuit on CT
module.
1. Compressor Thermal Overload
tripped.
2. High Pressure Trip switch
Tripped. Reset.
3. Contactor failure.
Revision 1.0.7 October 2018