9
MU 03.04.MMM REV.2
5. OPEATION ANOMALIES AND REMEDIES
All devices are throughly tested at works. Most malfunctions are caused by incorrect connections. The most common faults are
as follow.
TROUBLES
REASONS AND SOLUTIONS
Main led (green) OFF
•
Power supply failure
Check if supply voltage is present (fastons V-V).
Check if supply voltage is equal to the rated voltage of the regulator (fastons V-V).
Yellow capacitive led (–º–) is
ON without capacitors banks
working
•
••
•
Reverse the connections on the terminal A-A (K-L)
Banks led ‘s (1-2-3) ON but
capacitors banks not working
•
Check if supply voltage is equal to the rated voltage of the regulator (fastons V-V).
•
••
•
Check if phase “L1” has been connected on “C” terminal.
•
Check the neutral connection on contactors.
•
••
•
Check the three-pole contactor.
All capacitors banks on with a
low inductive load on the
network
•
••
•
Power of P.F. equipment not sufficient
Check the capacitors feel and/or increase the power.
•
••
•
C.T. is connected upstream to the load but not of capacitors
Connect the C.T. as shown in the connection diagram.
•
••
•
C.T. installed in the wrong phase:
connect to phase L1.
•
Possible capacitive load condition and terminal connection reverse.
Leds _
∩∩∩
_ and –³³– OFF
•
••
•
Possible stand-by condition:
at least one capacitor bank on, check the P.F. value.
•
••
•
Low C.T. signal current:
check the C.T. choise and the electrical connection by
considering that the minimum current signal must be 500mA.
•
••
•
Possible manual working condition:
chose the automatic (AUT) operation.
Yellow led capacitive (–³³–)
always lit also changing the
A-A (K-L) cables
•
Zero current signal:
check that the C.T. isn’t short-circuited.
Check the current signal on the secondary circuit of C.T. with tester.
•
••
•
C.T. connected on the supply cable of the P.F.C. equipment
Connect according to electrical scheme Fig.1.
•
••
•
C.T. installed in the wrong phase:
connect to phase L1.
•
Trimmer % not well regulated:
adjust it next “0”.
Continous switching on/off of
one bank (hunting phenomena)
•
The C/K value is not correct:
check in table “C/K” for the right value.
•
The power of first bank is too high.
Red alarm led is ON
•
Alarm of maximum temperature:
you
see paragraph 4. ALARMS.
Other operation anomalies: please check again the correctness of the installation operations
and check again all points of
“operation anomalies and remedies”. A simple connection mistake can cause the P.F.Controller to function incorrectly. If the
P.F.Controller continues to work incorrectly, contact the Technical Office of the COMAR CONDENSATORI S.p.A,
referring
to the serial number of the equipment
(visible on the plate) and
the value of measured current on the secondary circuit of
the
C.T.
Fig.1
Electrical connection of QR6 regulator
Fig.2
Front of the electronic regulator type QR6
