AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 9
Fan
Pulse control
To obtain energy savings it is possible to pulse control the power
supply to the fans at the evaporators.
Pulse control can be accomplished in one of the following ways:
- during the thermostat’s cutout period (cold room)
- during night operation and during the thermostat’s cutout
period (appliance with night lid)
A period of time is set as well as the percentage of this period of
time where the fans have to be operating.
Cutout of fans during plant breakdowns
If the refrigeration in a breakdown situation stops, the
temperature in the cold room may rise quickly as a result of the
power supply from large fans. In order to prevent this situation the
controller can stop the fans if the temperature at S5 exceeds a set
limit value.
Fan pause
When the setting P65 is set to a value greater than 0, the fans will
stop while the night blind is rolling down.
Eco-mode
When the night blind is down, the fan speed can be reduced.
Eco-mode is not allowed if the heating function has been
activated.
When Eco-mode is enabled, relay DO8 will be activated.
Light function
The function can be used for controlling the light in a refrigeration
appliance or in a cold room. It can also be used for controlling
a motorised night blind.
The light function can be dened in more than one way:
- The light is controlled via a signal from a door contact.
The light will remain on for 2 minutes after the door has been
shut.
- 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.
• Two signals, both of which can be on before the light goes on.
One can be a DI contact signal at the appliance (fx DI3) and the
other can be via data communication or a voltage signal.
Voltage signal must be activated on DI7.
The light is switched o when "r12" (Main switch) is set to o
(see o98).
The light is switched o when the appliance cleaning function
is activated.
If an override of the light is desired, this can be done via pulse
pressure on a DI input + setting = 19.
Extra light (light 2)
Light 2 can also be activated by one DI input, e.g. DI4.
It can also be controlled with two signals. For two signals,
the second signal must be sent with a voltage signal on DI8.
Period time
Light 2
(extra light)
controlled by
DI8 and fx DI4.
Light 1
controlled by
DI7
and fx DI3.
Override of light 1
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