UGH017/0500
Series 1 Portable Chillers, PLC Control
T
ROUBLESHOOTING
6-17
C
HECKING THE
P
RESSURE
T
RANSDUCER
Always refer to the wiring dia-
grams you received with your
chiller to locate specific elec-
trical components.
The transducer produces a 0.5-4.5 VDC analog signal that is
read by the PLC, which relates it to a pressure, based on the
range of the transducer. To check and adjust the pressure
transducer:
Locate the pressure transducer.
Use the wiring diagrams that came with your chiller for
exact location. Location varies depending on size of your
chiller.
Check the connections.
Make sure all connections to the transducer are secure.
Tighten as needed.
Check the supply voltage to the transducer.
Voltage should be 5VDC. Refer to the wiring diagram for
the exact location.
Check the control signal in the electrical panel
if the supply voltage is correct (step 3). Refer to the
wiring diagram for the exact location. If the signal is out-
side the 0.5-4.5 VDC range replace the transducer.
Check the transducer with a gauge.
If the reading is within the 0.5-4.5 VDC range, test the
line with a refrigeration gauge. Compare this number with
the reading on the Control screen. To get to the proper
screen on the control, from the main screen, press Status.
Use the scrolling arrows to move to the Suction Pressure
or Discharge Pressure screen. If the gauge and PLC
screen readings are not within 5% of each other, replace
the transducer.
WARNING: Coolant hazard
Refrigerant can cause freezing of skin. All prop-
er precautions should be taken any time the
refrigerant system is worked on. Any adjustment
that involves the refrigerant should only be per-
formed by a certified refrigeration technician.
1
2
3
4
Pressure
Transducer
5
