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4.6.3
Multimaster Control
ATTENTION
Damage to the unit!
Damage to the unit and the controller by applying external voltage to the Multimaster inputs/outputs.
•
Do not apply external voltage to the Multimaster inputs/outputs (MM1 / MM2).
•
The Multimaster inputs/outputs are supplied from the cooling unit with a low voltage (< 20 V, 20 mA).
The Multimaster function can control up to six cooling units in the system (bus function). The connection is made on the input
and output side by the terminals MM1 and MM2.
4.6.3.1
Connecting the Multimaster control
Requirements
DANGER – Danger to life due to electric shock. Make sure that the unit is voltage-free.
Procedure
Fig. 23: Multimaster Control
1.
Connect the controllers of the cooling units according to the connection diagram and Fig. 23 to the appropriate terminal
strip MM1 / MM2, see "Electrical circuit diagram – Multi-Controller (MC)", Page 43.
–
Use a shielded cable with twisted pairs to avoid interferences. Connect the shield to the terminal for function
ground on one side.
–
If no shielded cables are used, make sure that there are no sources of interference in the immediate vicinity.
Sources of interference are: Power cables and components with increased electromagnetic radiation, these
include, for example, frequency converters or motor drives.
The Multimaster control is connected.
Operating Manual | Roof-mounted Cooling Unit | Multi Controller (MC) – 230 V | 086100023c
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