Gardner Denver ELECTRA-SAVER EAYQ E, Руководство по эксплуатации и обслуживанию

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13–10–613 SP Page 63
CONTROLS TROUBLESHOOTING GUIDE
The following are recommended service actions. Observe all instructions noted elsewhere in this manual. All electri-
cal service is to be performed only by a qualified electrician.
Symptom Recommended Action
No display, Check incoming power to the compressor unit. Ensure that the disconnect is
compressor stopped on and that fuses have not blown (or circuit beaker tripped). If power is being
properly supplied to the control box, check the fuses located at the fan starter,
the control transformer fuses, and the wiring to connector CN–6.
Compressor will To operate, the controller must be placed into an operating mode (e.g. “AUTO);
not start. press the [STOP]RESET] key to put the control into the READY state, then se-
lect a mode with the operating mode keys. In AUTOMATIC and SEQUENCE
modes, compressors will not start until the pressure drops below the reset
pressures.
Display indicates The controller prevents attempts to start the main motor if the reservoir pres–
“NOT BLOWN DOWN” sure is over 5 psig. Pressure continues to be relieved from the reservoir while
this message is on, and the compressor will start automatically after the pres-
sure has dropped. If this message remains with NO pressure in the reservoir,
follow the transducer zeroing procedure found in the controls adjustment sec-
tion.
Display indicates The controller is provided with an input for user–furnished remote controls.
“REMOTE STOP” This display indicates that 120 volt is removed from terminal 6 of the terminal
strip. Check all connections of the factory installed jumper, or the custom-
er–provided controls, if applicable.
Display indicates If the display indicates “SHUTDOWN”, refer to the shutdown troubleshooting
“SHUTDOWN” section for assistance. In addition to the messages shown, there are several
internal and system diagnostics performed by the controller. Consult the facto-
ry for additional assistance.
Compressor runs, In the CONSTANT RUN and LOW DEMAND modes, the compressor will not
but does not load load until the pressure drops below reset pressure. Refer to the operating
instructions for further information. If pressure is below the reset pres-
sure,check that the inlet valve operates freely. Check that the TVO, TVC, IVO
and IVC valves are wired and operating properly.
Compressor runs, If the inlet valve closes at low pressure, check the wiring to the blowdown valve
unloads at low pressure and the piping and check valves in its discharge line.
Compressor does On units with turn valve control, the turn valve will control delivery for moderate
not modulate to heavy demands to maintain the system near the programmed set pressure,
with the inlet valve held open. At light demands, the inlet valve controls the
compressor delivery to maintain pressure approximately 3 psi above the pro-
grammed set pressure, with the turn valve held open. If the pressure continues
to rise above these pressures, check that the turn valve and inlet valve operate
freely, and check wiring and piping to control valves TVO, TVC, IVO and IVC.
If normal modulation does occur, the inlet valve will be closed during a blow-
down as pressure approaches the high pressure limit.
Compressor cycles The external air receiver should be sized appropriately to prevent rapid rapidly
between load cycles. The rapid response time in the CONSTANT RUN mode will operate
and unload with small receivers, but any plant air system will operate more efficiently with
adequately sized storage. Refer to the operating instructions for further in-
formation.