Technical documentation
Rev. 02
Reactive Factor Controller CX plus
65
12.3 Over-temperature switch-off steps
The controller shall switch off the active steps depending on the temperature in the switch cabinet in
case of over-temperature.
Solution:
The CX plus is equipped with a temperature sensor (NTC) integrated under the housing. The limit
value, at which the switching outputs of the active steps shall be switched off one by one while the
temperature alarm is still active, can be set in the alarm system. In this way, the steps are protected
against overheating and the temperature in the switch cabinet can return to normal.
Procedure:
Set the temperature limit 2 in the SETUP/513.
Set the temperature limit 2 in the SETUP menu. The temperature limit 1 (SETUP/512) may have
to be reduced, because the minimum setting range of the temperature limit 2 depends on the set
temperature limit 1:
TEMP2
min
= TEMP1 + 5K
Activate the function
“
Switch off steps one by one in case of TEMP alarm
” (SETUP/503)
Activate the function “
Switch off steps one by one in case of TEMP alarm
” (step switch-off
sequence) in the
SETUP/503: SETUP/503 ==
YES
Delay time TEMP alarm / cycle step switch-off sequence (SETUP/504)
Set the delay time for the TEMP alarm in the SETUP menu 504. At the same time, this is also the
cycle for the step switch-off sequence.
Function:
Upon exceeding the temperature limit 2, the set delay time (SETUP/504) will run out first. After the
delay time has run out, the message
is signalled on the display and the contact of the
alarm relay is activated. After the set delay time has run out again, the step switch-off sequence
begins: In the process, the last active step (AUTO, FON) is switched off first. All active steps (AUTO,
FON) are switched off one by one in the cycle of the set delay time, for as long as the temperature
alarm is still active. All steps which are switched off by the alarm system are locked for 30 min. When
all active steps have been switched off, the control is stopped.
NOTE:
The alarm system does not switch off steps in manual operation. The step switch-off sequence
does not start until you leave the MANUAL menu.
If the temperature in the switch cabinet falls and if the temperature falls below the temperature limit 2
by 5 K, a still active step switch-off sequence is cancelled. The control starts again and may switch
steps on and off again. The steps which have been switched off by the alarm system, however, remain
locked for the duration of the blocking time and thus are not available for the control.
If the function “Manual reset” (SETUP/501 = NO) is deactivated, the alarm messages (display and
alarm relay) are automatically reset after 15 s. The alarm relay is only reset, if no other alarm is active.
