Telemark Cryogenics 3600 - Over Pressure and Phase Error Diagnosis; Over Pressure and Mechanical Protection Issues

Telemark Cryogenics Microprocessor Based Cryochillers
Page
50 of 63 Revision 1.0.7 October 2018
4.3 Trouble Shooting Guide
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Symptom
Possible Cause
Corrective Action
LCD does not
illuminate
No system power Check mains input
Missing phase Check mains input
Stop/Reset not reset
Reset by pushing and pulling the Start
stop button.
LCD illuminates but
START/STANDBY
button does not
illuminate
Check LCD for error message
If unit is running and pre cool is
displayed this is a normal
condition.
Consult error message guide for
possible cause and rectify. Probable
cause system pressure or liquid line
temperature.
LCD and
START/STANDBY
illuminated but
system does not
start when pressed
Display message
“OVER
PRESSURE’ or
“E1”
Over pressure trip has been
triggered
Check static pressure is in the range
235 - 250psi. Reset trip and restart.
Trip resets with an audible “click”
LCD and
Start/Standby
illuminates but
system does not
start when it is
pressed or LCD
displays gibberish
There has been a momentary
power out check the rest of your
plant
Reset by pushing and pulling the
STOP/RESET button.
System runs and
then stops
Check LCD for system status
Most common cause of this is either
the value for discharge pressure DP
too high or the suction pressure too
low. Check over pressure trip and
review system balance pressure.
There has been a momentary
power out. check rest of plant.
Reset Push Stop/Reset button and
pull to reset
Phase error
Compressor noisy – There is a
phase problem.
LCD should gives message
Compressor Error. Swap 2 of the
phases reset system and restart.
E3 LT High
Check the LT temperature does
not exceed the pre-set value
(40
o
c) especially during initial
cool down or when the system
is under full load. At these
points the heat dissipated to the
water is at its maximum E3 LT
High displayed
Most likely cause is, cooling water
inadequate flow or the cooling
capacity of your chiller is too low.
Check water flow in and water flow
out correct orientation.
Over Pressure
Display Message
“OVER
PRESSURE”
System mechanical over
protection triggered
During initial cool down it is possible
the balance pressure was too high the
cooling water flow is too low /
reversed or there was a problem with
the systems off-load valve. Reset
system and restart if fault persists
allow system to warm up until CT is at
least +10
o
C and check system
balance pressure.