Honeywell CD3000M User Manual page 53

Honeywell
10. Maintenance
10.1 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
Green LED is
always light
off.
Green LED
(PW) light on
and green LED
Thyristor unit
(ON) in light off
doesn't go in
condition.
conduction with
Green LED
input signal.
(PW) in light
on condition
and green LED
(ON) in light on
condition.
Load current Green LED
flows also with (ON) always in
no input signal. light off
condition.
Current flows at Yellow HB in
nominal value light on
but yellow LED condition.
(HB) in light on
condition.
Red LED (SC) is Red LED in
lighted also if light on
current is at condition.
nominal value.
Thyristor unit
doesn't work
properly.
www.honeywell.com/imc
CD3000M-1PH from 125A to 700A
Possible reasons of the symptom
No voltage auxiliary power
-
supply to terminals 1 -3 (see
wiring diagram).
No input signal.
-
Reversed polarities of input
-
signal.
Reset contact in open condition
-
(see wiring diagram).
Fuse failure.
-
Load failure.
-
Load connection interruption.
-
Thyristor faulty and always in
-
open circuit.
With HB option the yellow led
-
(HB) in light on condition.
Short circuit on thyristor. If
-
there is HB circuit the red LED
(SC) is light on.
HB circuit not tuned.
-
Current transformers not
-
properly wired (if are external
to CD3000).
HB circuit not properly tuned.
-
Wrong input signal selection.
-
Wrong input signal calibration
-
(out of range).
Auxiliary voltage supply out of
-
limits.
52
User's Manual
Actions
Give auxiliary voltage supply
-
to terminals 1-3.
Provide to give input signal.
-
Reverse the input signal
-
polarity.
Make link on reset terminals.
-
Substitute the fuse.
-
Repair the load.
-
Provide to repair the wiring.
-
Substitute the faulty
-
thyristor.
Check the load.
-
Substitute the thyristor.
-
Check that load is not in
short circuit.
Push CAL button in front unit
-
to start HB calibration
procedure.
Control current transformers
-
wiring and Push CAL button
in front unit to start HB
calibration procedure.
Push CAL button in front unit
-
to start HB calibration
procedure.
Control input signal setting.
-
Repeat input calibration
-
procedure.
Verify the auxiliary voltage
-
supply.