Danfoss ADAP-KOOL AK-PC 783, Design Manual, Page: 66 / 128

66 Capacity controller RS8GN202 © Danfoss 11-2013 AK-PC 783
In our example, the oil supply is
controlled separately for each
individual compressor.
The settings are shown here in
the diagram.
The process is as follows:
20 seconds after the signal from
the level switch is given, the oil
injection starts. This pulsates
three times with one minute
intervals. Each pulse lasts one
second. Then there is a pause for
20 seconds. If the level switch
has not registered any oil at this
point, the compressor is stopped.
In our example, there is only one
single separator that has just one
level switch.
The settings are shown here in
the diagram.
The process is as follows:
When a signal is given from the
level switch, the discharging
process to the receiver
commences. This pulsates three
times with one minute intervals.
Each pulse lasts one second. If
the level switch does not register
an oil drop at this point, an alarm
is given when the delay time has
expired.
5. Set oil management for the
compressors
Press the
+
-button to go on to the
next page.
6. Set oil separator
5
Compressor oil setup
Select whether the oil supply to all the compressors is to
be shared at the same time or whether each compressor is
to be controlled separately.
Advanced stop control
'Yes' means pulses will be allowed following compressor
stop
Oil cycle pre delay
Delay time before oil pulses commence
Oil cycle post delay
Delay time for signal that will stop oil pulses
High oil alarm delay
If an activation of the level switch is not registered
before the time has expired, an alarm will be given. (the
compressor not use the oil).
No of periods
No. of pulses that are to be enabled in a oil filling sequence
No of periods before stop (Advanced stop control =
yes)
If oil is still missing after this number of pulses, the
compressor is stopped. The remaining number of pulses
will then be permitted.
Period time
Time between pulses
Oil valve open time
The valve's opening time for each pulse.
6
Separator
Select whether there should be one shared separator for
all the compressors or one separator for each compressor.
Level switch
Select whether the separator is to be controlled by "one in
which all pulses are carried out", "one in which the pulse
sequence is stopped by the switch-level " or one in which
the level is held between "High" and "Low".
Level alarm delay
Alarm given when using a level switch for low level.
Repeat oil return cycle
Time period between repeat emptying processes from the
separator if the level switch stays at high level.
No oil sep. alarm delay
Alarm delay when a signal is given that oil is not being
separated ("high" level contact not activated)
No of periods
No. of times the valve should open in emptying sequence
Period time
Time between valve openings.
Open time
The open time of the valve
Configuration - continued