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Operating instructions
multicomp
Page 42 of 62
Version 4.00
This means that the fan switches on when 28°C is exceeded and switches off again when temperature drops
below 23°C. The overtemperature alarm is triggered when 50°C is exceeded and is reset when temperature
drops below 45°C. The overtemperature stage switch-off turns on when 55°C is exceeded. After the
temperature has dropped below 50°C the stages are hooked up again, if required, after the discharge time has
elapsed.
The overtemperature switch-offs for the individual stages are added together so that it can be determined later
on whether, and in which cabinet, there are temperature problems (see menu Stages 3.10).
The overtemperature stage switching performance is as follows:
1.) Reducing the cabinet temperature when the alarm threshold is exceeded (prerequisite: at least 2
cabinets)
When the alarm temperature is exceeded and a dwell time of 3 minutes has elapsed, the device tries to replace
the stage with an equivalent stage (same stage power and detuning, same type (thyro/contactor)) from a
cabinet with low temperature. After a dwell time of another 3 minutes, the device tries to replace the next stage.
If the cabinet temperature falls under the alarm temperature (not yet below hysteresis threshold), no further
stage is replaced. (the hysteresis is not working!)
2.) Temperature as selection criterion when switching stages on or off
If the alarm temperature has been exceeded in a cabinet, the temperature is used as a criterion for selecting
the stage to be switched.
If several stages with the same stage power and detuning reactor factor are available for selection, the stage
with the higher cabinet temperature is preferred for switching off. For switching on, the stage with the lowest
cabinet temperature is preferred.
The temperature is only used as a selection criterion if the alarm temperature is exceeded, as otherwise the
stage "circuit switching" does not work anymore.
3.) Emergency shut-down
If the switch-off temperature is exceeded, only one stage is switched off at first. The next stage is not switched
off until a dwell time of 2 minutes has elapsed.
If the temperature falls below the switch-off temperature (not yet below hysteresis), no other stages are
switched off (due to overtemperature). On the other hand, no stages of this cabinet are switched on as long as
the temperature does not fall below the hysteresis threshold.
As soon as the temperature falls below the hysteresis threshold, the stages in this cabinet are released for
compensation.
Temperature measurement, incl. enabling:
Parameters:
Temperature measurement
= active / inactive
Operating point fan
= 0 to 70°C / hysteresis = 0°C to 25°C
Operating point alarm
= 0 to 70°C / hysteresis = 0°C to 25°C
Operating point overtemperature
= 0 to 70°C / hysteresis = 0°C to 25°C
Temperature parameters
Menu description
P
O
N
M
¢
Fans
Alarm
EDIT
Display hot-key area
I
I
I
I
I
I
I
Enabling / disabling temperature measurement
I
I
Operating point and hysteresis alarm relays and overtemperature switch-off
I
Operating point and hysteresis fan relays and overtemperature switch-off
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