Oldham MX 52, Commissioning, Operating And Maintenance Manual

Page: 53 / 96

53
Channel in maintenance mode
for more than 30 minutes. Return the channel to normal
operation by pressing the
Calibration key (Item C, Fig.
26).
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 measuring 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 detector must
be calibrated.
An LED does not light up even
though the corresponding
threshold is exceeded and the
buzzer and relay are actuated. Faulty LED. Perform a general test on the
LEDs by pressing the TEST
key on the keypad (Fig. 26)
and, if the LED still does not
light up, the programming
must be modified by using the
“Unit programming” menu
(buzzer connected?).
An alarm is triggered, the LED
lights up and the relay is
actuated but there is no audio
alarm. The buzzer strap is not
correctly positioned.
Fall the buzzer switch
(Fig. 26).
The buzzer is not programmed
as “in service”. If the audio alarm is wanted,
the programming must be
modified by using the “unit
programming” menu (buzzer
connected?).
The audio alarm stops after 30
s although alarms are still
actuated. The buzzer is programmed to
operate for 30 seconds only. If the buzzer is to be sounded
as long as the alarms are
actuated, the programming
must be modified by using the
“Unit programming menu”
(continuous buzzer?).
An alarm is triggered but the
slaving controls are not
actuated. The relays are faulty.
Short-circuit or open the relay
contact (as applicable) on the
MX52 terminal block (Fig.
12) and, if the slaving
controls operate normally, the
corresponding channel board
must be repaired by an
approved technician.