61
NOTE:
If the delay time has not run out yet and if the digital input is activated again, an active I-LOW-
alarm is suppressed immediately. If the digital input is no longer activated, the delay time is restarted
(60 s). I-LOW-alarm is signalled after the delay time has run out.
E
XTERNAL ALARM OVER DIGITAL INPUT
An external alarm (e.g. over-temperature by thermostat) has to be detected by the CX plus.
Solution:
The digital input of the controller may be used for detection of external alarm signals.
Procedure:
Activate the function
“
digital input alarms
” (SETUP/518).
Set the setting to “di” in the SETUP menu 518.
Set the logic of the digital input (SETUP/511).
The logic may be set in the SETUP menu 511, whether the digital input is HIGH or LOW active:
“YES”
= HIGH active
“NO”
= LOW active
Function:
If the digital input is activated, an active alarm will be detected by the controller.
“
----
” is shown on the
status display for digital input alarm detection (SETUP/519). In case an external alarm is detected, the
di-alarm is activated after a delay time of 10 s. In the sequel, all activated stages (FON- and AUTO-
stages) will be switched off according to the time which is set in menu “switch-off interval of stages”
(SETUP/523) if SETUP/520 = YES.
If the signal of the digital input alarm is no longer lasting at the input, the alarm will be reset by the
controller with a delay time of 10 s. All recently switched-off stages will be blocked for 30 minutes.
If the digital input is no longer activated (SETUP/511 = NO), the digital input alarm detection is
deactivated. An active external digital input alarm will not be detected.
D
ETECTION OF STAGE POWER LOSS
(S
TAGE
P
OWER
L
OSS
)
The CX plus shall detect the power loss of the individual stages and switch off and permanently lock
the affected stages in case the value falls below a limit value.
Solution:
The CX plus continuously adjusts the current stage size to the determined value when switching a stage
on and off. This function is also active when the stage recognition is switched off.
The alarm system of the CX plus compares the current stage size of each individual stage with the
original stage size:
Stage size in % of the initial value = current stage size / original stage size *100%
If the current stage size decreases below 75% of the original stage size, the alarm system triggers a
stage alarm
“stage power loss” and switch off and permanently lock the affected stage.
The stage alarm
“stage power loss” serves as protection of the upstream throttle of the individual
capacitor stages. The capacitor and the upstream throttle form a filter (absorption circuit). This is
designed in a way that an odd harmonic is not completely absorbed. If the current stage power has
already fallen below 75% and if it continues to fall, there is the risk that the absorption circuit completely
absorbs the odd harmonic. In this way, the throttle is overloaded and will finally be destroyed.
Procedure:
Activate the function “Stage alarm stage power loss“ (SETUP/516).
Set the setting to “YES” in the SETUP menu 516.
