Gardner Denver ELECTRA-SAVER EAYQ E, Operating And Service Manual

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13–10–613 SP Page 64
CONTROLS TROUBLESHOOTING GUIDE (Continued)
Symptom Recommended Action
Low reservoir pressure The ES+ controller will maintain a minimum pressure in the oil reservoir while
in CONSTANT mode in CONSTANT or in other modes while the blowdown valve is closed. This or
other modes before occurs only after initially loading the compressor unit. If reservoir pressure
blowdown drops while the blowdown valve is closed, check for leaks between at the reser-
voir, separator, and connected piping.
Erratic pressures The sequencing system transmits low–level signal between units to commun–
in SEQUENCE only icate pressures. Units must be properly grounded to a good ground system,
the communications cable should use only appropriate quality cable, and the
cable should be run in its own conduit.
Compressor cycles In the sequence mode, the operating system requires all compressors be piped
rapidly in SEQUENCE directly to receiver, such that all transducers sense the same pressure. Check
mode only valves or restrictions between compressors and the storage will cause system
instability. Run units in AUTOMATIC mode until the system is corrected.
Error in displayed Pressure measurement errors are almost always the result of poor zero adjust–
pressure or ment. This must be done after replacement of a controller or a transducer.
“CHECK XDUCER” The proper display with all pressure removed is 0 +/–1 psig. The adjustment
while zeroing procedure will prevent large zeroing errors, and recommend that the transduc-
ers be checked.