Danfoss AK-CH 650 - Supply Voltage

AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02 37
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Supply voltage
Supply voltage is only connected to the controller module. The
supply to the other modules is transmitted via the plug between
the modules. The supply must be 24 V +/-20%. One transformer
must be used for each controller. The transformer must be a class
II. The 24 V must not be shared by other controllers or units. The
analog inputs and outputs are not galvanically separated from the
supply.
The + and – 24V input must not be earthed.
Transformer size
The power consumption grows with the number of modules used:
Module Type Number á Eect
Controller 1 x 8 = 8 VA
Extension module 200-series _ x 5 = __ VA
Extension module 100-series _ x 2 = __ VA
Total ___ VA
Example continued:
Controller module 8 VA
+ 1 extension module in 200-series 5 VA
+ 1 extension module in 100-series 2 VA
------
Transformer size (least) 15 VA
Common pressure transmitter
If several controllers receive a signal from the same pressure trans-
mitter, the supply to the aected controllers must be wired so that
it is not possible to switch o one of the controllers without also
switching o the others. (If one controller is switched o, the sig-
nal will be pulled down, and all the other controllers will receive a
signal which is too low)