ICPS600A402_1_oms - page 27

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© Danfoss A/S (IA-MC/mhe) 05-2007 / 520B2809
Fault location
Probable cause
Remedy
No voltage on coil
Check whether valve is de-energised open or closed (NO
or NC):
1. Usea magnetic detector
2. Lift coil slightly and note whether it offers resistance
against lifting
Note: Never remove a coil with voltage applied - it may
burn out.
Check relay contacts. Check lead connections. Check
fuses.
Check to make sure the coil's electrical requirements are
the same as the installation supply. Measure the opera-
ting voltage at the coil. Permissible voltage variation:
±10% for dual frequency; dc and NO applications
+10% / -15% for ac on single frequency voltages
If necessary, replace coil with correct version.
Incorrect voltage/frequency
See page 29
Coil burnt out
Check coil data. If necessary, replace coil with correct
version.
Reduce differential pressure, e.g. by limiting inlet pres-
sure.
Diff. pressure too high
Check coil data and differential pressure. If necessary,
replace coil with correct version.
Diff. pressure too low
Replace valve
Dirt at diaphragm
2)
Clean diaphragm. If necessary, replace defective
component(s)
1)
.
Dirt in valve seat/dirt in arma-
ture/armature tube
2)
Clean valve; if necessary, replace defective component(s).
Corrosion
Replace defective component(s)
1)
Components missing after
valve dismantling
Fit missing component(s)
1)
.
Damaged/bent armature tube
Symptom:
Solenoid valve does not open
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