Danfoss AK-PC 551 User Manual page 8

Menu
Start/stop
Main switch
Extern Main swich
Plant type
Select Plant type
Refrigerant type
Unit of setpoints
Night signal via DI
Main Switch via DI
Mains frequency
Alarm output
Alarm buzzer
Suction A
Control status
8
Main switch
Start and stop regulating here.
The configuration settings will require that regulating is stopped.
If you try to enter a configuration setting when regulating has started, the controller will
ask if regulating should be stopped.
When all settings have been made and the main switch is set to "ON", the controller will
enable the display of the various measurements. Regulation will start. (If an external main
switch has been defined, it must also be "ON" before regulating starts.)
External main switch
It is possible to connect an external switch which can be used to start and stop regulating.
Both the internal and external main switch must be ON before regulating starts.
An external main switch can be defined in the menu "Plant type" - "Main switch via DI".
Plant settings:
The following must be regulated:
• Compressor group
• Condenser group
• One compressor group (A) + One condenser group
• Two compressor groups (A) and (B) + One condenser group
Refrigerant setting
Before refrigeration is started, the refrigerant must be defined. You may choose between
the following refrigerants:
R12, R22, R134a, R502, R717, R13, R13b1, R23, R500, R503, R114, R142b, user defined,
R32, R227, R401A, R507, R402A, R404A, R407C, R407A, R407B, R410A, R170, R290, R600,
R600a, R744, R1270, R417A, R422A, R413A, R422D, R427A, R438A, R513A (XP10), R407F.
Warning: Wrong selection of refrigerant may cause damage to the compressor.
Other refrigerants: Here Setting "user defined" is selected and then three factors - fac1, fac2
and fac3 and temperature glide (if necessary).
Device for controlling compressor and condenser
Select pressure or saturation temperature.
(Can be set during initial set-up and must not be subsequently changed.)
Night time operation via DI signal
Define an external switch here, so that the regulation reference can be raised and lowered
externally.
1. Set the function to "Yes"
2. Go to I/O configuration and select an available digital input. Set this input to
"Night condition"
3. Next, define whether the function is to be active when the signal is ON, or when it is OFF.
Main switch via DI
Define an external main switch here, so that regulation can be started and stopped
externally.
1. Set the function to "Yes"
2. Go to I/O configuration and select an available digital input. Set this input to "Main switch"
3. Next, define whether the function is to be active when the signal is ON, or when it is OFF.
Frequency
Set the net frequency
Alarm relay
Define an alarm relay here that will be activated in the event of an alarm.
1. Select the alarm priority that will activate the relay
• No relay
• Critical alarm
• Severe alarm
• All alarms
2. Go to I/O configuration and select an available digital output. Set this output to "Alarm"
3. Next, define whether the relay will be active (pulled) when the alarm is ON, or when it is
OFF.
Alarm sound
Here the sound generator can be defined to emit a sound in the event of an alarm.
Select which alarm priority will activate the sound generator:
• No buzzer
• Critical alarm
• Severe alarm
• All alarms
(In the event of an alarm, the sound generator can be stopped by moving across the
active alarm screen; see page 6)
Regulation status
User Guide RS8GY302 © Danfoss 2015-06
SW: 1.5x
On / Off
Fac: None
Fac: None
Temp. / press
Fac: Saturated
DI-demand
No / Yes
Fac: No
DI-demand
No / Yes
Fac: No
50 Hz / 60 Hz
Fac: 50 Hz
DO-demand
Fac: No relay
Fac: No buzzer
AK-PC 551