ENMET MX-52 - Manual (Page 36)

ENMET Corporation MX52 C ONTROL
32
6.2 Troubleshooting: Symptoms and Remedies
N OTE : ENMET and our representatives and distributors are available to supply you with calibration gas or a
maintenance contract.
S YMPTOMS C AUSES R EMEDIES
Display channel not lighted and no
indicator lights on. On/Off switch in the Off position. Set the switch to the On position
(item A, Fig. 10).
Problem with AC supply or DC
power supply (24 V DC). Check the supply voltages and, if
necessary, check the electric power
supply circuit breakers.
Mains fuses blown. Replace the mains fuses (see item
A, Fig. 5).
DC power (24 V DC) input fuses
blown. Replace the 24 V DC fuses located
at the back of the MX52 unit (item
B, Fig. 5).
+24 V DC internal protection fuse
blown. Replace the +24 V DC fuse located
on the power board (item C, Fig. 5).
C AUTION :
When replacing a fuse, use the required type and rating.
Fault indicator light on (in steady
mode). Faulty electrical connections on the
4-20mA sensor/transmitter wiring Check the connections on the MX52
terminal block and the S/T terminal
block. Check that there is no short
circuit or break in the 4-20mA.
Faulty sensor/transmitter. Repair or replace the S/T.
The type of S/T does not match the
channel configuration. Connect the correct type of S/T with
the corresponding channel.
CAUTION
The channel or wiring may be
damaged.
Negative offset too great (more than
20% of measuring scale). Perform calibration on the S/T and,
then, on the control, if necessary. If
the problem persists, the sensor
must be replaced.
Channel in maintenance mode for
more than 30 minutes.
Return the channel to normal
operation by pressing the
Calibration key (Item C, Fig. 10).
Fault indicator light on (in steady
mode) and SUP displayed.
The measurement is higher than
100% of the measuring scale.
To acknowledge the alarm, the
channel must be switched off and
then switched on again (by
programming).
If the problem persists and the
measurement is not consistent with
reality, the S/T must be calibrated.
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