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Technical Information
Figure 11: DIP switch
Configuration via Display / Modbus
If DIP switch 1
– 6 are OFF the configuration of the Modbus address is done via display configuration (see
6.2) respectively Modbus Write-parameter 543.
4.5
Digital Inputs
4.5.1 Defrost synchronization
The defrost synchronization is a simple 1-bit bus function. The 8 V DC bus supply is provided separately by
the internal power supply (SELV).
Defrost groups can be established by a hardware connection of all cabinets in one group via the “Synchronized
defros
t” connector. The first device in the defrost group that triggers a defrost cycle causes defrost of all other
cabinets in the same group. A defrost cycle can be started using the real-time clock, interval timer or a Modbus
command. At the end of the defrost cycle, the last device in the defrost group starts refrigeration operation
again for the remaining cabinets in the defrost group.
4.5.2 Configurable digital inputs
Two digital inputs are configurable. For now four functions can be dedicated to these inputs.
4.5.2.1 Lighting controls (Day/Night operation)
Without any activation, the cabinet lighting is off and the night blinds are closed. Lighting can be turned on
and the night blinds can be opened using an external contact or Modbus command.
4.5.2.2 Bus alarm
This input is used as an external alarm. This function is currently used as a gas alarm. In case of a gas alarm
the hybrid fan will be switched on (only relevant for air-cooled cabinets).
4.5.2.3 Door input
The logical function of the door input is configurable. It can be a “NO” normal open or “NC” normal closed
contact. When the door input is activated, the compressor(s) and the fans are switched off. By releasing the
contact the cooling is activated and the fans are switched on again. In addition, a restart time delay can be
configured. If the delay time elapsed cooling is active and the fans are switched on even if the door is still
open. If a second delay time expires, the door open alarm is activated.
4.5.2.4 Standby mode
The standby mode can be active by an additional switch or a Modbus command. By entering this mode
cooling is terminated and all compressors are stopped. The fans and the light is switched off, the night
curtain moves up if down. All “Software alarms” like “high temperature” are cleared by entering the standby
mode and not evaluated in this state. Only “hardware alarms” will be indicated. The cabinet is not reacting on
the day/night input.
