Table of Contents
Advertisement
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 (ON) in light
off condition.
Thyristor unit
doesn't go in
conduction with
Green LED (PW) in
input signal.
light on condition
and green LED
(ON) in light on
condition.
Load current flows
Green LED (ON)
also with no input
always in light off
signal.
condition.
Current flows at
Yellow HB in light
nominal value but
on condition.
yellow LED (HB) in
light on condition.
Red LED (SC) is
Red LED in light on
lighted also if
condition.
current is at
nominal value.
Thyristor unit
doesn't work
properly.
www.honeywell.com/imc
CD3000M-2PH 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.
48
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.
Advertisement
Table of Contents
