10 Alarms - Carel FCM series Manual

10 Alarms

The instrument controls and constantly checks alarm conditions during unit operating. In the event of off-normal condition:
•
when not in the programming phase, the display shows a message that identifies the type of alarm (see table below). The alarm
message is shown alternatively to the normally displayed parameter every two seconds; in the event the regulator has interrupted
control action or other alarms have been detected, the display will show the symbol "---" as well as the other alarm indications. If the
normally displayed value is that of a probe temporarily disconnected, it won't be displayed until the probe has been connected again
(the probe value will then be shown alternatively to the dedicated alarm message);
•
the buzzer sounds, except in the event of EdF alarm;
•
the status of the controller and its analogue output depend on the type of alarm occurred;
•
the starting up of the relay digital output (if programmed as alarm indication) depends on the type of alarm.
When the cause that generated the alarm disappears, the controller and the digital output can be reset automatically or manually,
depending on the type of alarm. Turning off the buzzer and resetting the alarm message requires a manual operation (except for alarms
Er4, Er5 and EdF). Press PRG once to silence the buzzer and twice to make the displayed alarm message disappear.
Should an alarm be detected while displaying or modifying a parameter, press PRG to silence the buzzer. After that, PRG can be used to
save any modification and exit the programming procedure.
Type of alarm
Er0
disconnected probe 1
Er1 disconnected probe 2
(if C19 is different from 0)
Er2 faulty parameter
memory
Er3 alarm from digital
input
Er4 High alarm
Er5 Low alarm
EdF
Max. defrost time
The Er2 alarm will be shown permanently on the display due to:
•
faulty reading of the parameters memory (usually at start-up); factory-set parameters will be temporarily set but they will not be saved
in the parameters memory (it is possible, however, to access to the parameters and set their correct values again). We suggest
resetting the factory-set parameters.
•
faulty writing of the parameters memory (usually when pressing PRG). Any new modification won't be saved; it is possible, however,
to access to the parameters, modify their values and save them again.
Press to silence the buzzer and cancel the alarm message on the display.
Alarms Er3, Er4 and Er5 will not appear if there is a disabling command coming from terminal block.
FCM electronic regulator - Preliminary version
Effects on the regulation process
regulation is disabled and analogue output is determined by
C10 (while defrosting, the regulation continues
normally until the programmed max. defrost time has
passed)
the same as Er0 (if C19=4 without defrost, the regulation
process will go on normally)
disabled with analogue output to 0 V
disabled with analogue output to 0 V
determined by C10
(no effects or analogue out at 100%)
none
Effects on the
digital output
(when C31=1,2)
energised
none
energised
energised
none
(not available)
31
Reset
automatic as soon as
the probe is
reconnected; manual
reset for buzzer and
displayed messages
Re-programming
programmable: both
manual and
automatic as soon as
the external alarm
stops; manual reset
for buzzer and
displayed messages
automatic with
program.
Differential; (manual
if the differential has
been given a high
value)
automatic reset if the
next cycle is carried
out correctly
Cod. +302235300 - Rel. 2.0 del 30/11/98