AK-PC 781A
Capacity
controller RS8HE202 © Danfoss 2017-07
59
Sd compressor alarm delay
Delay time for the alarm
Sd compressor safety cutout
Set whether safety cut-out should be enabled
9 - Minimum operation times
Configure the operation times here so "unnecessary operation"
can be avoided.
Restart time is the time interval between two consecutive starts.
Safety timer
Cutout delay
The time delay resulting from drop-out of automated safety
measures and until the compressor-error is reported. This setting
is common for all safety inputs for the relevant compressor.
Restart delay
Minimum time that a compressor should be OK after a safety cut-
out. After this interval it can start again.
10 - Misc. functions
Injection On
DO: Select this function if a relay must be reserved for the func-
tion. (The function must be wired to controllers with expansion
valves in order to close liquid injection for the safety cut-out of
the last compressor.)
Network: The signal is sent to the controllers via data com-
munication.
C
ompressor start delay
Delay time for compessor start
Injection Off delay
Delay time for "Injection off"
Liq. inj suction line
Select the function if a liquid injection is required in the
suction line in order to keep the discharge gas temperature
down.
Regulation can be done either using a solenoid valve and a
TEV, or using an AKV valve.
AKV OD suction line
Opening degree of the valve in %
Inject start SH
Superheat value where the liquid injection starts
Inject diff SH
Differential when adjusted for superheat
Inject start Sd temp.
Start temperature for liquid injection in suction line
Inject diff. Sd temp.
Differential when adjusted on Sd
SH Min suction line
Minimum superheat in suction line
SH Max suction line
Maximum superheat in suction line
AKV period time
Periode time for AKV valve
Inject delay at start up
Delay time for liquid injection at start-up
SCREW COMPRESSOR CONTROL
Use Economizer
Choose the compressor to control an EVR to an ECO function
Use Liq. injection (individual Sd)
Choose whether to be liquid injection into the compressor at
high Sd. Stopped again 20 K below "Max. Discharge '
Output type
Select valve signal to the stepper or analog signal
Max. liquid injection OD
Set max. opening degree of the valve in %
Max. discharge temp
Max Sd temperature by individual Sd measurements.
Summary of Contents for AK-PC 781A
Page 39: ...AK PC 781A Capacity controller RS8HE202 Danfoss 2017 07 39 Example continued ...
Page 42: ...42 Capacity controller RS8HE202 Danfoss 2017 07 AK PC 781A ...
Page 90: ...90 Capacity controller RS8HE202 Danfoss 2017 07 AK PC 781A ...
Page 133: ...AK PC 781A Capacity controller RS8HE202 Danfoss 2017 07 133 ...
