SECTION 5
TROUBLESHOOTING
p. 5-5
05148382
Booster pump pressure
above 125 psi
If at anytime the pump is running and the booster
pump pressure is above 125 psi, the relief valve is
opening up and sending water to the drain.
5.4 TROUBLESHOOTING – HYDRAULIC
5.4.1 Hot Hydraulic Oil
Restricted or No Cooling
Flow
Check cooling water flow to and from heat exchanger.
The water pressure differential across the heat
exchanger, 2.75 bar (40 psi) minimum required for
flow through the exchanger.
Check operation and setting of water modulating valve.
Water Modulating Valve
Setting
Check and adjust setting of water modulating valve.
Compressing spring (clockwise) slows water flow and
increases temp; reducing spring tension
(counterclockwise) increases water flow and lowers
oil temp.
Heat Exchanger Clogged Flush heat exchanger, improve flow of cooling water or
replace heat exchanger.
Recirculation Pump
Hydraulic Pressure
below 20psi
Replace hydraulic oil filter.
If filter is new, replace recirculation pump.
5.4.2 Hydraulic Pressure but no High Pressure Water Pressure
Proximity switch failure Verify left hand and right hand LED lights on DC
alternately illuminate ON/OFF. If so, both proximity
switches are properly functioning.
If both the green and red LED lights are on at the same
time on one proximity switch, replace the proximity
switch.
Flag the proximity switches one at a time, checking to
see if it is sending a signal to the PLC.
I/O relay failure
Check if PLC output is shifting the I/O output relays
and allowing power to go to the coils on the
directional valve.
Directional valve coil
failure
Check coils on the directional valve with a volt meter to
verify good or bad
PLC failure If there are inputs from the proximity switches but no
outputs, contact IR service for a logic review and
verification of PLC failure.
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