Description of the hardware
6.2 SIRIUS 3RA62 compact starter reversing starter
SIRIUS 3RA6 Compact Starter
44 System Manual, 02/2008, GWA 4NEB 560 0601-02 DS 02
6.2 SIRIUS 3RA62 compact starter reversing starter
Features
The 3RA62 compact starter reversing starter is made up of the following components:
● Reversing starter
● Two removable main conductor terminal blocks
● Two 6-pin removable auxiliary and control conductor terminal blocks
(A1+/A2 -, B2/B1, "overload" and "short circuit/malfunction" signaling switch and internal
auxiliary switches)
● Two optional external auxiliary switch blocks (2 NO contacts, 2 NC contacts or
1 NO contact + 1 NC contact)
Control is either via the control voltage connection at terminals "A1+", "A2/B2-" and "B1+" or
via the AS-i mounting module.
For additional information on the AS-i mounting module, please refer to "
AS-i mounting
module for co
mpact starter (Page 47)".
Direction of rotation interlock
The contactors for the reversing starter's direction of rotation are interlocked. This precaution
prevents the contactors for direction of rotation 1 and direction of rotation 2 from being
activated simultaneously, which would result in a short circuit.
Contactor interlocking is implemented on both a mechanical level (against shock loads) and
an electrical level (against incorrect activation).
● Mechanical protective interlock: A tumbler gear is used to interlock the directions of
rotation mechanically. If the main contacts for direction of rotation 1 are closed, the
tumbler gear will prevent the main contacts for direction of rotation 2 from closing at the
same time, and vice versa.
● Electrical protective interlock: The reversing starter has an auxiliary contact (NC contact)
for each direction of rotation. Each auxiliary contact blocks the control current of the other
direction of rotation, i.e. if the main contacts for "direction of rotation 1 (2)" are closed, the
relevant auxiliary contact will open and interrupt the control circuit for "direction of rotation
2 (1)". This ensures that the main contacts for "direction of rotation 2 (1)" cannot be
switched even if the control voltage for "direction of rotation 2 (1)" is present.
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