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Error: Unbalanced step or CT ratio
different in lines for output nr 'A' 'B' 'C'
'D'...
Error: Too big step difference"
A4. Post Alarm Restarting Procedure
Once a protection level is reached (see paragraph 4.3.1.4.1) or when the internal
temperature is higher than 85°C:
-
all the capacitor steps are switched off
-
an alarm message appears on the LCD display
-
the alarm relay opens
When the alarm condition disappears, the RVT will automatically restart.
The restarting procedure will depend on the type of event that caused the alarm, as
indicated in the following table:
Event having occurred
Urms < Umin prot
Power outage
Urms > U max prot.
Temp internal > 85°C
One of the eight T probes temp > its
max. protection level
THDV > THDV max prot.
72 Appendices ç Manual Power Factor Controller RVT
Check that CT's ratios are the same value.
Check capacitor and contactor connections.
Check capacitor currents for each phase.
Check sequence and reactive power value per output.
RVT restart behavior after event has disappeared
- Opens alarm relay immediately
- Resumes normal behavior after a time equal to ON-
Delay(*)
- Resumes normal behavior after a time equal to Reset-
delay(*)
- Opens alarm relay immediately
- Resumes normal behavior after a time equal to ON-
Delay(*)
- Event considered as disappeared, when Temp internal <
80°C
- Opens alarm relay immediately
- Resumes normal behavior after a time equal to ON-
Delay(*)
- Opens alarm relay immediately
(external optional probe T1-8)
- Resumes normal behavior after a time equal to ON-
Delay(*)
- Opens alarm relay immediately.
- Resumes normal behavior after a time equal to ON-
Delay(*).
Anti-hunting protection:
If the same event occurs within one hour, the RVT will
resume normal operation after a time equal to 2x ON-
Delay.
If the same event occurs again within one hour, the
restart time will be doubled to 4 x ON-Delay, and so on up
to a maximum of one hour.
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