30
b
For high-efficiency pumps with 0-10 V / PWM signal input, the power supply can be made via the additional func-
tions "always on" or "parallel operation V1/V2" on relays.
Settings of the cascade function
Activation of the cascade function
The controller of the cascade for fresh water systems is a special function that is activated via the hidden menu.
b
In order to access the cascade function in the menu, press the ESC button for 10 seconds upon switching on. Upon
the next powering on the function will remain visible when it was activated.
b
For cascade mode, all controllers of the cascade must be connected using the supplied CAN bus cable. For this
purpose, the controllers are looped, i.e. serial connection from one controller to the next with a terminator linked at
the beginning (1.controller) and at the end (2. controller).
Activating the function
The cascade function is activated by assigning a free relay within the special functions to the cascade.
b
There must always be one relay assigned, even if there is no shift valve connected to this relay for the cascade; this
may be the case if the cascade is operating with a fixed base station.
Select a free relay in the menu “Special functions” and confirm the cascade function, e.g. relay 3. When this function is
activated, all the required parameters can be set.
Fixed base station
If the cascade operates with a fixed base station, you can set this control as the base. This station will then always be in
operation or on standby.
b
If a controller has no shutoff valve, nevertheless a relay must be assigned to activate the function. In this controller
the setting “fixed base” has to be activated.
DF
Here the upper flow limit is set in % of the DF sensor. If this limit is exceeded, an additional station from the cascade is
requested.
b
If the currently running station does not reach the set tapping temperature despite 100% speed of the primary
pump, a further station is automatically requested!
DF Station-
Here the bottom flow limit is set in % of the flow sensor. If the flow falls below this limit, the station will switch itself off. If it
is the base station, this bottom limit will be ignored.
Delay
This parameter sets the delay that will elapse after deactivation or activation of the device before it is activated again or
a new request is sent. The value to be set here depends primarily on the run time of the used cascade valves (opening
and closing time).
Function description
Situation 1. Switching on a station
Example: Set DF+ Value 70%, flow regulator maximum 40 l/min
If the value measured by the flow controller exceeds 28 l/min the next regulator with a closed valve will be searched in the
list. It receives a request to open its valve. If after a set delay the flow is still too high, another station is added. The closing
of the valve of the newly added station is being prevented during the set delay.
Situation 2. Switching off a station
Example: Set DF- Value 40%, flow regulator maximum 40 l/min
If the flow sensor detects less than 16 l/min and if this station was not just switched on (delay time pending), the valve is
closed.
Process description
The controllers cyclically exchange CAN messages. This ensues at least every 10 seconds. The cycle is shortened when
the flow changes or new settings that have to be transmitted are detected. Each controller builds a list of the entire cas-
cade network. The controllers are consecutively numbered. Each controller recognizes the flow rate and the valve status
Summary of Contents for SC ACS 160
Page 9: ...9 ENGLISH WIRING DIAGRAM ...
Page 43: ...43 ENGLISH ...
