Danfoss AK-PC 772A, User Manual

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40 Capacity controller RS8HF102 © Danfoss 2017-07 AK-PC 772A
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Example continued:
Controller module 8 VA
+ 1 extension modules in 200 series 5 VA
+ 1 extension modules in 100 series 2 VA
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Power supply size (least)
15 VA
+ Separate power supply for the module with the step-
per motors:
Modules valve control
7.8 VA
CCM valve 1.3 VA
CCMT valve fx. 5.1 VA
-------
Power supply size (least)
14.2 VA
Power supply size
The power consumption grows with the number of modules used:
Module Type Number á Effect
Controller 1 x 8 = 8 VA
Extension module 200 series _ x 5 = __ VA
Extension module 100 series _ x 2 = __ VA
Total ___ VA
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 power supply must be used
for each controller. The power supply 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.
If using stepper motor valves, the supply for these must be pro-
vided from a separate power supply.
CO2 regulation makes it necessary to safeguard the voltage to the
controller and valves using UPS.
Common pressure transmitter
If several controllers receive a signal from the same pressure trans-
mitter, the supply to the affected controllers must be wired so that
it is not possible to switch off one of the controllers without also
switching off the others. (If one controller is switched off, the sig-
nal will be pulled down, and all the other controllers will receive a
signal which is too low)