Light function
The function can be used for controlling the light in a refrigeration
appliance or in a coldroom. It can also be used for controlling a
motorised night blind.
The light function can be defined in three ways:
- the light is controlled via a signal from a door contact. Together
with this function a time delay can be set so that the light is kept
on for 2 minutes after the door has been closed.
- the light is controlled via the day/night function
- the light is controlled via the data communication from a system
unit.
Here there are two operational options if data communication
should fail:
- The light can go ON
- The light can stay in its current mode.
The light load must be connected to the NC switch on the relay.
This ensures that the light remains on in the appliance if power to
the controller should fail.
The light is switched off when "r12" (Main switch) is set to off (see
o98).
Night blind
Motorised night blind can be controlled automatically from the
controller. The night blinds will follow the status of the light
function. When the light is switched on, the night blinds opens
and when the light is switched off, the night blinds close again.
When the night blinds are closed, it is possible to open them and
switch on the light using a switch signal on the digital input. If this
input is activated, the night blinds will open and the refrigeration
appliance can be filled with new products. If the input is activated
again, the blinds close again.
A night blind is open and light is switch on when the appliance
cleaning function is activated.
A setting can define that the night blind is open when "r12" (Main
switch) is set to off (see o98).
When the night blind rolls down, the fans can be stopped so that
the air circulation does not interrupt the positioning of the blind.
The desired stop time must be set in P65.
The motor for the night blinds must be connected to the same
relay as the light function.
Door contact
The door contact function can via the digital inputs be defined for
two different applications:
Alarm monitoring
The controller monitors the door contact and delivers an alarm
message if the door has been opened for a longer period than
the set alarm delay.
Alarm monitoring and stop of refrigeration
When the door is opened the refrigeration is stopped and the
fan are stopped and light switch on.
If the door remains open for a longer time than the set restart
time, refrigeration will be resumed. This will ensure that
refrigeration is maintained even if the door is left open or if the
door contact should be defective. If the door remains open for
a longer period than the set alarm delay an alarm will also be
triggered.
Digital inputs
There are two digital inputs DI1 and DI2 with contact function and
one digital input DI3 with high voltage signal.
DI1 and DI2 input can be used for the following functions:
- Retransmission of contacts position via data communication
- Door contact function with alarm
- Starting a defrost
- Main switch - start/stop of cooling
- Night setback
- Thermostat bands switch
- General alarm monitoring
- Case cleaning
- Override of night blinds
- Case shut down
- Coordinated defrost (DI2 only)
DI3 is predefined as input from the safety circuit for the
compressors. When the voltage on the input is interrupted, the
compressors will stop, and the alarm "A97 - Comp.Safety" will be
activated.
User Guide | Controller for SemiPlugin appliance, AK-CC 460
8 | BC230086440483en-000201
© Danfoss | DCS (vt) | 2019.12