V2.01
25361_EDEBD
A0281-2320-1_EN
9
Functional principle
tive power compensation system and causes the fan to be switched on if a predefined
temperature threshold is exceeded and switched off again when the temperature drops
below the reset temperature.
To prevent the fan from switching unnecessarily often, it has a run-on time of 30 minutes.
You can switch the fan (relay output 12) on or off permanently using the "Stage status"
menu. If you select "Auto", the fan output is controlled by the temperature measuring
input.
You can also protect the system by defining a switch-off temperature. This makes it pos-
sible to switch stages off in time if there is a risk of damage due to overheating. Once the
temperature drops below the reset temperature, the stages are switched on again one
after the other.
The settings are saved on an EEPROM so that they are not lost in the event of a power
failure.
The measuring cycle of the controller used to record the necessary network parameters
takes approx. 20 ms.
NOTE
Limit for overvoltage switch-off = measuring v 10% (taking the measuring volt-
age ratio into account). This value cannot be changed and serves to protect the compen-
sation system.
In the event of an error, the compensation stages are switched off. The alarm relay switch-
es and "Overvoltage" is displayed.
CAUTION
The discharge times are automatically predefined,
in the capacitor contactor stage
, for
the following programmed stage powers. However, these must be checked and corrected
if they differ from the capacitor specifications.
Capacitor power
Discharge resistance
Discharge time
0.1 kvar – 9.9 kvar
300 kOhm
60 seconds
10 kvar – 19.9 kvar
300 kOhm
120 seconds
20 kvar and above
300 kOhm
180 seconds
A discharge time changed later on is retained however, as long as the stage power is not
changed.
In the thyristor stages
, irrespective of the stage power, the discharge time is always
entered as 20 milliseconds, both when reprogramming and when changing the stage
power.
