RGF 300
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7.0 TROUBLE SHOOTING
Some of the problems which may occur during or after unit commissioning are listed below with their
possible solutions.
Problem
Cause Solution
Unit supplied but load does not activate.
C1
. Absence of one or two phases (
Led
AC LINE
on).
C2
. The load is not connected.
C3
. No control signal.
C4
. Incorrect operating mode (
direct,
reverse
) and
Set - points
not adequate
for signal control.
C5
. Maximum voltage supplied to lower
load at minimum starting voltage.
C6
. Remote
STOP
(
ON-OFF
) (
MB
4,
5
contacts closed).
S1
. Check supply connections and input
phases.
S2
. Check there are no electrical
interruptions between regulator and
load.
S3
. Check sensors for correct operation
(return voltage) and connections to
terminal board
MA
.
S4
. Check
P3
trimmer calibration and
positions of jumpers
J8/J9
,
J2/J3,
J10/J11/J12.
S5
. Check
P4
trimmer calibration.
S6
. Check
STOPS 4, 5
control contact
on
MB
terminal board.
Tension can be read on outlet terminal
heads to load (circa
370 VAC
) but
motor does not start.
C1
. Load not connected to regulator
terminals.
S1
. Check electromagnetic switch or
motor / regulator connection sectioner.
S2
. Check the motor heat protection.
Cutting regulators supplies voltage to
the load but load does not activate.
C1
. Minimum voltage supplied to load
is lower than needed for starting.
S1
. Check
P6
trimmer calibration.
Protection fuses burn out.
C1
. Regulator undersized for load used.
C2
. Interference on supply lines.
C3
.
By-pass
configuration with short
circuited phases.
S1
. Check powers involved as well as
starting and operating currents.
S2
. Check the supply line and if
necessary install mains or 'surge' filters
upstream of the cutting regulators.
S3
. Check input and output phase
correspondence.
After correctly operating for a certain
time, cutting regulators supplies the
maximum voltage load regardless of
control signal.
C1
. Lack of ventilation and/or high
working temperature in the unit.
C2
. Detection transducer faulty or short-
circuited.
S1
. Check the unit is mounted
vertically; check the room temperature
where the unit is installed.
S2
. Check input control voltage (
MA
terminal board).
Unit regulates load in
ON - OFF
operation.
C1
. Proportional band too "narrow"
with respect to system response.
C2
.
CUT-OFF
too high (
80%
).
S1
. Increase the proportional band value
with trimmer
P2
.
S2
. Decrease value of
P6.
Unit has suspended regulation and Led
TK ALARM
is on.
C1
. External safety device has
intervened (contact
MB 6,7
).
S1
. Check unit reset type (see position
of jumper
J13
).
S2
.Check activation of the safety
device and the cause of the intervention.
Unit has suspended regulation and Led
AC LINE ALARM
is on.
C1
. A fuse has burnt out or one of
supply phases is absent.
S1
. Replace supply line fuse and check
beginning of line upstream.
Output voltage constant even with
control signal activated and
MANUAL
(Heat-Pump mode)
Led is on.
C1
. The
MAN
contact (heat-pump) is
closed.
S1
. Select correct operating mode (
NO
contact) by activating contacts
2,3
of
terminal board
MB
.
Table 7
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