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The time delay for the switching from delta to star operation can be set using the parameter
Del. slow
speed
(menu 3-2-2-1). In the
KKGG
and
KKKG
operating modes, the switching to high speed during night
operation can be disabled to prevent noise using the parameter
Fast speed N
(menu 3-2-2-1).
If the gas cooler outlet temperature exceeds the setpoint specified in
t
G
-Max
(menu 3-2-2-1), the high speed is
loaded independently from the parameter described above. The fans do not switch back to the low speed again
until the capacity stages are shifted down due to the falling pressure.
5.6.5 Regulation of the fan speed with continuous control
For the regulation of the gas cooler outlet temperature t
G
, the controller calculates a fan speed that is specified
via an analogue output or via Modbus. The following parameters are available in menu 3-2-2-1
Min. Drehzahl = Minimum speed
Max.Drehzahl T = Maximum speed day operation
Max.Drehzahl N = Maximum speed night operation
P-Wert = Configurable proportional factor
I-Wert = Configurable integral factor
Intervall I = Time interval for calculation of the I-component
Offset = Offset for fan speed control signal
tG-Max = tg- Max threshold value
The parameter
Min. speed
specifies the minimum speed that must not be undercut when a fan is switched on.
The maximum fan speed for the day and night operation can be limited using the parameters
Max.speed D
and
Max.speed N
. The changeover of the limit values is performed using the setpoint shift (see
).
If the tg- Max- threshold values is exceeded during night operation, the fan speed is limited again to the
Max.speed D
limit value. If the
TG-Max
threshold value is set to "---", no shifting down to
Max.speed D
during
night operation is performed. The input is made in percent and refers to the speed range of the fans.
Power supply bridging (not for fan control via Modbus)
In the case of exceeding tg-Max limit value
or any fault of the fan speed controller, power supply bridging is
activated.
The activation of the power supply bridging can be deactivated by setting the parameter
tG-Max
to "-".
The power supply bridging is performed by switching the speed controlled fans to the mains power supply via
an output of the controller and the 1st capacity stage (enable speed actuator) is disabled. Switching to
controlled operation is performed when the gas cooler outlet temperature has undercut the setpoint again. The
switching to mains operation for speed control is performed with the second fan stage and for the combined
control with the fan stage (
No. cond. 1
). The mains operation for stages combined control is
deactivated if the motor overload cut-out of L1 trips.
5.6.6 Control algorithm for parallel combined control type of control
The speed controller regulates the speed of all fans connected in parallel that can be switched on or off
individually. Depending on the expansion stage of the controller, the following maximum numbers of fan stages
can be controlled:
•
Basic configuration: 3 fan stages
•
Configuration with one SIOX extension module: 7 fan stages
•
Configuration with two SIOX extension modules: 11 fan stages
In the case of condenser combined control, it must strictly be ensured that the output for the power
supply bridging is used.
Содержание VS 3015 C
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