Danfoss AK-PC 781A

24 Capacity controller RS8HE202 © Danfoss 2017-07 AK-PC 781A
Extension module AK-XM 208C
Function
The module contains:
8 analog inputs for sensors, pressure transmitters, voltage signals
and contact signals.
4 outputs for stepper motors.
Supply voltage
The supply voltage to the module comes from the previous mod-
ule in the row. Here supplied with 5 VA.
The supply voltage to the valves must be from a separate supply,
which must be galvanically separated from the supply for the
control range.
(Power requirements: 7.8 VA for controller + xx VA per valve).
A UPS may be necessary if the valves need to open/close during a
power failure.
Light-emitting diodes
There is one row with LED’s. It indicate the following:
• Voltage supply to the module
• Communication active with the bottom PC board (red = error)
• Step1 to step4 OPEN: Green = Open
• Step1 to step4 CLOSE: Green = Close
• Red flash = Error on motor or connection
Output:
24 V d.c.
20-500 step/s
Max phase current = 800 mA RMS
∑ P
out
= max. 21 VA
Separate voltage
supply is required
24 V ac./d.c. fx. 13 VA
max. 10 V
Valve data
Type P
ETS 12.5 - ETS 400
KVS 15 - KVS 42
CCMT 2 - CCMT 8
CCM 10 - CCM 40
1.3 VA
CCMT 16 - CCMT 42 5.1 VA
Power supply to AK-XM 208C:
Fx: 7.8 + (4 x 1.3) = 13 VA  AK-PS 075
Fx: 7.8 + (4 x 5.1) = 28.2 VA  AK-PS 150