Sumitomo F-70L - Compressor Reset Functions

Troubleshooting
35
Problem
Possible Cause
Corrective Action
LCD reads Return Press-
ERR
Note: Low return pressure.
Set point is 15 psig
Low helium gas charge
Return pressure transducer
fault
PCB 1 fault
See Helium Gas Pressure
Specifications in the Operating
Manual
Replace transducer
Replace PCB 1
LCD reads Water Temp-
ERR
Note: Incoming water high
temperature set point is
35°C
High supply water
temperature
Temperature transistor fault
PCB 1 fault
Check temperature; correct if out of
specifications.
Replace transistor
Replace PCB 1
LCD reads Water Flow-ERR
Note: This warning
condition is inferred from
high outgoing water
temperature.
Note: Outgoing water high
temperature set point is
46°C
Low water flow
High supply water
temperature
Excessive load on
compressor
High helium charge
pressure
High differential
pressure
PCB 1 fault
Check flow rate; correct if outside
specifications
Check temperature; correct if out of
specifications
See Specifications in Operating
Manual
See Specifications in Operating
Manual
Replace PCB 1
Compressor Reset Functions
1. MAIN POWER circuit protector trip:
Rotate knob fully counter-clockwise to OFF. Rotate to ON.
IMPORTANT: Locate source of fault and any short circuit damage prior to reset and
compressor operation
2. Normal reset: used to clear controller faults and warnings:
Remote reset through DIAGNOSTIC INTERFACE connector
From front panel, simultaneously depress scroll up button and scroll down button