Functions Of The Reset Buttons; Sirius 3Rw40 2, 3Rw40 3, And 3Rw40 4 Soft Starters - Siemens SIRIUS 3RW30 Manual

Functions

5.4 Functions of the RESET buttons

Thyristor protection (short-circuit)
SITOR semiconductor fuses must be connected upstream to protect the thyristors against
short-circuits (e.g. in case of cable damage or an interturn fault in the motor; refer to chapter
Soft starter assembly with type of coordination 2 [Page 61]). For the fuse selection tables,
refer to chapter Technical data [Page 121].
Protection against voltage failure (in the event of a fault)
If the control supply voltage fails during a trip, the current tripping state of the thermal intrinsic
device protection model and the current recovery time are stored in the soft starter. When the
control supply voltage is restored, the current tripping state of the thermal intrinsic device
protection prior to the power failure are likewise automatically restored.
NOTICE
If the control voltage is disconnected during operation (e.g. in "automatic mode"), the starter
is not protected against voltage failure. You must wait five minutes between two starts to
ensure that the motor protection and the intrinsic device protection are working correctly.
5.4 Functions of the RESET buttons
5.4.1

SIRIUS 3RW40 2, 3RW40 3, and 3RW40 4 soft starters

5.4.1.1 RESET MODE button and LED
By pressing the RESET MODE button, you define the reset procedure in case of a fault. This
is indicated by the RESET MODE LED.
Note
On the SIRIUS 3RW40 2. soft starter, the RESET MODE button is located underneath the
label (refer to chapter Operator controls, displays, and connections on the 3RW40 [Page 70])
36
Yellow = AUTO
Off = MANUAL
Green = REMOTE
Manual, 01/2010, 535 1995-02 DS01
SIRIUS 3RW30 / 3RW40