Maintenance; Trouble Shooting - CD Automation CD3200 User Manual

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