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Electronic motor starters and drives
Rapid Link system
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| Speed Control Unit RA-SP |
Speed control unit RA-SP is used for electronic
variable speed control of three-phase motors.
Note: Unlike the other Rapid Link system devices, the RA-SP speed
control unit’s enclosure is fitted with a heat sink and requires an
EMC-conformant mounting and connection.
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Connections
Speed control unit RA-SP is supplied ready for connection. The
connection to the AS-Interface® data bus and the motor is described
below. The connection to the power bus is described in the earlier
general section “Rapid Link system”. |
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The unit is connected to AS-Interface® through an M12
plug with the following PIN assignment:
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On the RA-SP the motor feeder features a
metal-encapsulated socket. To meet EMC requirements, this is connected
with PE and heat sink over a large area. The matching plug is also
metal-encapsulated and the motor cable is screened. The length of the
motor cable is limited to 10 m. The motor cable’s screen must have a
large-area connection with PE at both ends, and the motor connection
terminals must also, therefore, meet EMC requirements.
The motor is connected through a halogen-free 4 × 1.5 mm²
+ 2 × (2 × 0.75 mm²), screened, DESINA-conformant
motor supply cable with a length of 2 m, (SET-M4/2-HF) or 5 m,
(SET-M4/5-HF).
Alternatively you can assemble your own motor supply cable with plug
SET-M4-A, with 4 × 1.5 mm² + 4 × 0.75 mm²
contact.
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For controlling braking motors, their manufacturers
provide braking rectifiers, which are fitted in the motor terminal
strip.
Note: When using speed control unit RA-SP, do not connect the
braking rectifier directly to the motor terminals (U/V/W) |
