Danfoss AK-PC 560 User Manual page 12

Condenser couplings
When the compressor relays have been established the turn
comes to the fan relays.
The first vacant relay (DO3-DO8) will become the first fan relay.
It will be followed by the subsequent relays. If more relays are
required than the vacant DO relays, a relay module can be
connected to the analog output. The function is, as follows:
If there are up to four external fans on an EKC 331:
Output signal from AK-PC 560
In EKC 331 the voltage range must be set to 0-5 V ("o10" = 6).
In EKC 331 the number of steps must be set to 4 ("o19" = 4) (also when
fewer fans are connected).
Connection
Alternating start-up of fans (only if c29 is 11 to 18)
The fans can be defined to start alternately when they have all
been stopped.
The first time regulation is started, fan 1 will be started first – the
regulation determines whether additional fans will be started.
After the next time all fans are stopped, fan 2 will be the first to be
started, and so on.
Fan 1 will again be the first fan to be started when the rotation has
been through the total number of fans.
If there is more than one fan on an EKC 331, it will not be possible
to start the other fans first. Here, the fan with the lowest voltage
step will always be the one which is started first.
If the entire condenser capacity is to be controlled by a frequency
converter, AK-PC 560 must send an analog signal about the
required capacity ("c29" = 9).
The signal varies from 0 to 10 V. Signal and capacity have the
following context.
12 Manual RS8GE202 © Danfoss 01-2016
If there are more than four external fans on two EKC 331 units:
1. 2.
Output signal from AK-PC 560
In the first EKC 331, set 0-5 V ("o10" = 6).
In the second EKC 331, set 5-10 V ("o10" = 7).
In both EKC's the number of steps must be set to 4 ("o19" = 4) (also when
fewer fans are connected to the second EKC).
Connection
AK-PC 560