Set Oil Management - Danfoss AK-PC 781A User Manual

Configuration - continued

Set oil management

1. Go to Configuration menu
2. Select Oil management
3. Set refrigeration circuit
Press the +-button to go on to the
next page
60
We do not use safety relays in our
example.
In this example, we want to
control the oil receiver.
This is done with a pressostat.
Here, we have chosen a
pressostat.
The pressostat should be set as
follows:
- Select pressure transmitter
When the pressure drops in the
receiver, the valve should open.
- Set the pressure level at which
the valve should open. Set at 30
bar, here.
- Set the pressure level, at
which the valve should close
completely again. Set at 35 bar,
here.
In the example, we have two level
switches in the receiver. Both one
high and one low.
Capacity controller RS8HE202 © Danfoss 2017-07
3
Oil control safety relay
If this setting is set to YES, the controller will reserve a safety
relay for each compressor. The relay terminal is connected
in series to the compressor relay. The relay can hereby
stop the compressor, if a lack of oil is registered when the
compressor is force controlled. (Forced controlled to ON
with the setting "Manual" or with the "changeover" on an
extension module.)
Danfoss recommends this function to avoid any compres-
sor damages due to lack of care.
(In order to keep things simple, this function is not used as
an example.)
LT sync to MT
Select this if the controller is on low pressure control and
should be synchronised with high pressure regulation.
Oil receiver
Select whether you wish to activate pressure regulation in
one of the oil receivers.
Level switch receiver
Define the desired level sensors. High / Both Low and
High
Level alarm delay
Delay time tor level alarm
Input for pressure build
Select whether the pressure is controlled by a pressostat or
signal from the pulse counter.
Comp. per. to start seq.
(For pulse counter): Percentage value of total pulses of the
different compressors
Pressure buildup seq.
(For pulse counter) Select between:
Only pulses from the HP circuit. Pulses from both HP and
LP are included
Actual pressure
Measured value
Actual state
Status of oil separation
Cut out pressure
Receiver pressure for shutting off oil
Cut in pressure
Receiver pressure for turning on oil
High alarm limit
An alarm is given if a higher pressure is registered
High alarm delay
Time delay for alarm
High alarm text
Write an alarm text
Low alarm limit
An alarm is given if a lower pressure is registered
Low alarm delay
Time delay for alarm
Low alarm text
Write an alarm text
AK-PC 781A