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Operating Manual | Attachment and Installation Cooling Units | Multi Controller (MC) – 400 / 460 V, 3~ | 086100124 22/76
3.4.7 Multimaster function
Fig. 8: Multimaster Control
The Multimaster function can control up to six cooling units in the system (bus function). Several cooling units are connected
with each other by a 2-wire bus for this.
Functional description
• In the bus function, the cooling unit that reaches the switching threshold “T
nom
+ 2K” first activates the cooling mode.
• It is ended by the cooling unit that drops below the switching threshold “T
nom
- 2K” last.
• The energy-saving mode is ended by the cooling request of one of the cooling units in the bus function.
• The energy-saving mode is reactivated 15 minutes (delivery condition) after the last cooling request of one of the cooling
units in the bus function.
• If the minimum temperature alarm is triggered (Lit_, falling below the lower temperature limit), check the affected unit. If
the unit is part of a Multimaster system, the cooling requirement can be forced from another unit. If this is the case, the
proper functioning of each unit involved in Multimaster operation must be checked.
• All cooling units in the bus function can activate or end the cooling mode or the energy-saving mode. There is no
“master and slave function”.
• For details on the electrical connection, see chapter "Electrical circuit diagram", Page 41.
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