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13-8-623 Page 33
CONTROLS TROUBLESHOOTING GUIDE
The following are recommended service actions. Observe all instructions noted elsewhere in this
manual. All electrical service is to be performed only by a qualified electrician.
Symptom Recommended
Action
No display,
compressor
stopped
Check incoming power to the compressor unit. Ensure that the disconnect is on
and that fuses have not blown (or circuit beaker tripped). If power is being properly
supplied to the control box, check the control transformer fuses, and the wiring to
connector CN-2. Ensure that the ribbon cable is undamaged and plugged into both
the controller and keypad.
Compressor will
not start.
To operate, the controller must be placed into an operating mode (e.g.AUTO);
press the [STOP/RESET] key to put the control into the READY state, then press
[RUN] to begin operation. In AUTOMATIC mode, compressors will not start until
the pressure drops below the load pressure.
Display indicates
"NOT BLOWN
DOWN"
The controller prevents attempts to start the main motor if the reservoir pressure 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 pressure has
dropped. If this message remains with NO pressure in the reservoir, follow the
transducer zeroing procedure found in the controls adjustment section.
Display indicates
"REMOTE HALT"
The controller is provided with an input for user-furnished remote controls. This
display indicates that 120 volt is removed from terminal 5 of the terminal strip.
Check all connections of the factory installed jumper, or the customer- provided
controls, if applicable. Refer to “Connection To External Controls” in Section 3 or
4, as appropriate.
Display indicates
"SHUTDOWN"
If the display indicates "SHUTDOWN", refer to the shutdown troubleshooting
section for assistance. In addition to the messages shown, there are several
internal and system diagnostics performed by the controller. Consult the factory for
additional assistance.
Compressor runs,
but does not load
The controller loads the compressor when the pressure drops below load pressure.
Refer to the operating instructions for further information. If pressure is below the
load pressure, check that the inlet valve operates freely. Check that the magnetic
unloader valve is wired and operating properly.
Compressor does
not unload
The controller operates the inlet valve to maintain pressure near the programmed
unload pressure, matching delivery to demand. If the pressure continues to rise
above unload pressure, check that the inlet valve operates freely. If the operating
mode on the display indicates “REM” (V6.xx only), check and repair the remote
pressure controls.
Compressor
cycles rapidly
between load and
unload
The external air receiver should be sized appropriately to prevent rapid cycles.
The rapid response time will operate with small receivers, but any plant air system
will operate more efficiently with adequately sized storage. Refer to the operating
instructions for further information.
Low reservoir
pressure before
blowdown
The controller will maintain a minimum pressure in the oil reservoir while the
blowdown valve is closed. This occurs only after initially loading the compressor
unit. If reservoir pressure drops while the blowdown valve is closed, check for
leaks between at the reservoir, separator, and connected piping.
Содержание AUTO SENTRY RS2000
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