Fault
For target cos PHI=1 and inductive load
steps are switched out / for the already
compensated grid steps are switched in
Supply and consumption
exchanged.
Wrong cos Phi is displayed
Display “Measuring current<??”
(UNDERCURRENT)
Display: "OVERCURRENT”
Alarm relay: after 10 min.
Display: "UNDERCOMPENSATED”
Alarm relay:after 10 min.
Display: "OVERCOMPENSATED"
Alarm relay: after 10 min.
Display: "MEASURING VOLTAGE ??"
Alarm relay: after 10 min.
Display:”UNDERVOLTAGE”
Alarm relay: after 10 min.
Display: "OVER-TEMPERATURE"
Alarm relay: after 10 min.
Display: “HARMONICS”
Alarm relay: after 10 min.
Display: “WARN. SWITCH.OPERATIONS”
Notification for user only!
No influence on the control behavior.
Reasons / Solution
Check terminals of measuring voltage and
measuring current (l and k)!
Check phase position!
Check phase allocation
(voltage/current in same phase)
See above
Current in measuring range ?
Line interruption ?
Wrong current-converter factor ?
Current transformer short-circuited ?
Check ratio of current transformer (1/5A)
Go through measuring current range
Check connections and phase position !
All stages connected, target PF not reached:
- system sufficient dimensioned ?
Check connections and phase-position !
Capacitive grid although all stages are
disconnected
Measuring voltage missing !
Measuring voltage (in programming) must be in
line with real terminal voltage
Check programming over-/under voltage range
in EXPERT-MODE 2!
System temperature too high !
Outputs are switched off in stages irrespective
of power line conditions.
Stages switch off consecutively according to the
programmed time and control series.
Check grid conditions!
If permissible: increase threshold TDH-V (7 %)
Number of switching operations of a capacitor
branch has reached the pre-set limiting value of
50,000.
Reset possible in EXPERT-MODE.
Annex 2: Troubleshooting
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