Sumitomo F-70H, Руководство по обслуживанию

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Troubleshooting
31
LCD Display
First Line
Type Error Indication
Helium Temp-
ERR Shutdown High helium discharge
temperature
Temperature > 93°C (200°F)
Water Temp-
ERR Alarm High water supply
temperature. Temperature > 35°C (95°F).
Water Flow-ERR Alarm Low water flow Temperature > 46°C (115°F)
Motor Temp-
ERR Shutdown High compressor motor
winding temp (internal
protector open)
Return Pressure > 140 psig
while compressor is
commanded on.
Phase Seq-ERR Shutdown Phase sequence or
open fuse
Monitored by microprocessor
Return Pressure-
ERR Shutdown Loss of gas charge Return pressure < 15 psig.
DB-25 Config1-
ERR (or Config2) Shutdown Remote cable does not
match switch setting
Monitored by microprocessor
If the compressor has been shut down by one of these interlocks, do not restart until the
problem has been found and corrected. Refer to the Troubleshooting Guide to identify the
problem.
In the event of a shutdown error, the compressor motor and cold head valve motor are
turned off. The microprocessor will annunciate the error condition via signals at the System
Diagnostics Connector and via the LCD Display. Signals are available on the 25-pin
connector for output to an external device. See Figure 2 and Tables 1 and 2.
The Mains Power switch trips when steady-state current exceeds 1.2 x the front panel set
point. When tripped, the switch knob locates halfway between the on and off positions.
Clearing Error Conditions
NOTE
Errors can be cleared locally only when configuration mode is set for Mode 1.
When configuration mode is set for Mode 2, errors must be cleared using the
DB25 diagnostic interface.
When an error is corrected, the message(s) can be cleared from the display and the system
diagnostics connector by any of the following procedures:
•
Apply a momentary signal to the diagnostic interface connector, or
•
Press the DISPLAY UP and DISPLAY DOWN (arrow) buttons simultaneously, or
•
Turn the Main Power switch to off, pause briefly, then turn back on