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CD3200-1PH from 15A to 110A
User’s Manual
47
15
Maintenance
15.1
Trouble Shooting
Small problems sometimes can be solved locally with the help of the below tab of trouble shooting. If
you don’t succeed, contact us or your nearest distributor.
Symptom
Indication on
front unit
Possible reasons of the symptom
Actions
Green LED
(Aux)
always light off
•
No voltage auxiliary power
•
Give auxiliary voltage supply
(see wiring diagram)
Green LED
(Aux) light on
Green LED
(ON) light off
•
No input signal
•
Reversed polarities of input signal
•
Reset contact is open
•
Provide to give input signal
•
Reverse the input signal
polarity
•
Make link on reset terminals
(see wiring diagram)
Thyristor unit
doesn’t go in
conduction with
input signal
Green LED
(Aux) light on
Green LED
(ON) light on
•
Fuse failure
•
Load failure
•
Load connection interruption
•
Thyristor faulty and always in open
circuit
With HB option the yellow led (HB) is
light on
•
Substitute the fuse
•
Check the load
•
Check the wiring
•
Substitute the faulty thyristor
Load current
flows also with no
input signal
Green LED
(ON)
always light off.
•
Wrong wiring
•
Short circuit on thyristor
If there is HB option the red LED (SC) is
light on
•
Check the load wiring
•
Substitute the thyristor
Current flows at
nominal value but
Yellow LED (HB)
is light on
Yellow LED
(HB) light on
•
HB circuit not tuned
•
Current transformers not properly
wired
•
Make HB calibration procedure
•
Control current transformers
wiring
Current flows at
nominal value but
Red LED (SC) is
light on
Red LED
(SC) light on
•
HB circuit not tuned
•
Make HB calibration procedure
Thyristor unit
doesn’t work
properly
•
Wrong input signal selection.
•
Wrong input signal calibration (out
of range).
•
Auxiliary voltage supply out of
limits
•
Control input signal setting.
•
Repeat input calibration
procedure.
•
Verify the auxiliary voltage
supply
