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ENG
4.6.4
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.
4.6.4.1
Connecting the Multimaster control
Prerequisites
DANGER – Danger to life due to electric shock. Make sure that the unit is voltage-free.
Procedure
Fig. 17: Multimaster Control
1
Multimaster connecting plug X51
2
Mating plug
1.
Connect the controllers of the cooling units according to the connection diagram and Fig. 17 on the appropriate terminal
strip X51, see "Electrical circuit diagram", Page 40.
–
Use a shielded cable with twisted pairs to avoid interferences. Connect the shield to the terminal for function
ground on one side.
–
If shielded cables are not 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 | Attachment and Installation Cooling Units | Multi Controller (MC) – 400 / 460 V, 3~ | 086100126
3
Shielded cable, stripping length 8 to 9 mm
G00074
42/74
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