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3.6.2.4
Device connectors
Function
The device connectors can be used to loop through a common control supply voltage of 24 V
DC to reduce wiring complexity between the individual motor starters (3RM1...-.AA04).
Moreover, Failsafe motor starters with a 24 V control supply voltage (3RM11...-.AA04 /
3RM13...-.AA04) can be interfaced to one 3SK1 safety relay as a group via device
connectors.
The device connectors can either be snapped onto a standard mounting rail or can be
screwed onto a flat mounting wall.
If the motor starters are not to be interconnected side-by-side, device daisy chain connectors
must be used for the gaps, e.g. for thermal reasons (see "Derating (Page 51)").
The device connectors do not transfer commands.
Table 3- 4
Use of device connectors exclusively for the 24 V DC control supply voltage
By using device connectors, several 3RM1...-.AA04 motor starters can be jointly supplied
with a control supply voltage of 24 V DC. This requires the control supply voltage to be
applied to the A1 and A2 terminals of only one motor starter.
Up to ten motor starters can be connected to one 24 V DC control supply voltage with device
connectors. The 24 V DC control supply voltage must be within the operating range of 0.9 to
1.1 for this purpose. If the full operating range of 0.8 to 1.25 is to be used, no more than five
3RM1...-.AA04 motor starters can be used. Otherwise, the infeed must be repeated for every
5th 3RM1 motor starter.
The last motor starter in a row can be placed on a device termination connector.
SIRIUS 3RM1 motor starter
Manual, 11/2013, A5E0345285095020A/RS-AB/002
Order numbers for device connectors for 3RM1 motor starters
Description
Device connector for 3RM1 motor starters,
22.5 mm wide
Device connector for looping through
signals,
22.5 mm wide
Device termination connector for 3RM1
motor starters,
22.5 mm wide
including left cover for the first device
connector in the system configuration
3.6 Accessories and order number scheme
Order number
3ZY1212-2EA00
3ZY1212-2AB00
3ZY1212-2FA00
Description
45
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