English
Installation and operating instructions Wilo-SC/SCe-HVAC
53
In menu 5.4.2.0, it is possible to set the pressure threshold of the min-
imum pressure monitoring, and in menu 5.4.5.0, the delay time. The
behaviour of the switchgear when this pressure threshold is under-
shot can be selected in menu 5.4.3.0 (deactivation of all pumps or
continued operation). The collective fault signal is activated in all
cases.
External off
It is possible to deactivate the control device externally using a nor-
mally closed contact. This function takes priority; all pumps running in
automatic mode are switched off.
The pumps can be started in manual mode. The frost protection func-
tion is active.
Operation in the event of a sensor
fault
In the event of a sensor fault (e.g. wire break), the behaviour of the
switchgear can be defined in menu 5.2.3.0. The system is either
switched off or continues to run with a pump. In the SCe and SC...FC
versions, the speed of this pump can be set in menu 5.2.4.0.
Operating mode of the pumps
The operating mode of the pumps can be selected in menus 3.2.1.1,
3.2.2.1, 3.2.3.1 and 3.2.4.1 (hand, off, auto). In the SCe version, the
speed in “hand” operating mode can be set (menus 3.2.1.2, 3.2.2.2,
3.2.3.2 and 3.2.4.2).
Setpoint changeover
The control system can work with two different setpoints. They are
set in menus 1.2.1.1 and 1.2.1.2.
Setpoint 1 is the reference setpoint. A changeover to setpoint 2 is
performed by closing the external digital input (acc. to wiring dia-
gram).
If setpoint 2 is set to 0, all pumps are switched off and the frost pro-
tection function is activated.
Remote setpoint adjustment
Using the corresponding terminals (in accordance with the wiring dia-
gram), remote adjustment of the setpoint is possible using an ana-
logue current signal (4-20 mA). This function can be activated in
menu 5.3.1.0.
The input signal is always in relation to the sensor measuring range
(e.g. DDG 40: 20 mA corresponds to 40 m (water column)).
In control mode
T-c, 4-10 mA corresponds to 0-150 K.
If the external setpoint is 0, all pumps are switched off and the frost
protection function is activated.
Function of the collective run signal
(SBM)
The desired function of the SBM can be set in menu 5.5.1.0. In this
case, it is possible to select between “Ready” (switchgear is ready for
operation) and “Run” (at least one pump is running).
Logic reversal of the collective fault
signal (SSM)
The desired logic of the SSM can be set in menu 5.5.2.0. In this case, it
is possible to select between negative logic (falling edge in case of a
fault = “fall”) or positive logic (rising edge in case of a fault = “raise”).
Frost protection (not for control
mode
Δ
p-c)
A frost protection signal can be fed to the control system via a nor-
mally closed contact by means of the signal from a frost protection
thermostat. If the signal input is opened, a pump is activated at min-
imum speed with a delay, and the collective fault signal is activated.
After the normally closed contact closes, the system returns to the
specified automatic mode. The fault signal is reset automatically, but
can be read out from the history memory.
Frost protection operation is possible only if the system is switched
off by setpoint 2, analogue external setpoint or external OFF.
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