Wiring & Operation
Solbrake / SMB with Direct on Line Starter
Motor contactor
C
1
(with one N.O + two N.C contacts).
* Contact
C
1-3
- Holding N.O contact of contactor
C
1
* Contact
C
1-1
- auxiliary N.C contact of contactor
C
1
,
initiates the braking process.
* Contact
C
1-2
- auxiliary N.C contact of motor contactor
acts as an interlock preventing operation of brake
contactor as long as motor contactor is closed.
Brake contactor
C
2
(with one N.C contacts).
* Contact
C
2-1
- auxiliary N.C contact of contactor C
2
,
acts as an interlock preventing operation of motor
contactor as long as brake contactor is closed.
Note:
There is electro mechanical interlock between C
1
and C
2
.
Solbrake / SMB contacts
* Ca
contact (Solbrake / SMB terminals 3-4 ), contact
closes when Mains voltage is connected to Solbrake /
SMB terminals and terminal 1-2 are open.
*
Cb
contact (Solbrake / SMB terminals 5-6), closes upon
stop signal and contact terminals 1-2 closes after time
delay t
1
.
Notes
* Motor contactor C
1
cannot be operated when Mains
voltage is not connected to terminals L
1
and L
2
(internal
contact Ca in Solbrake / SMB, controlling motor
contactor, closes after Mains voltage is connected and
terminal 1-2 are open.
* When operating in Manual mode, DC injection will stop
after time delay t
3
as set on the Braking Time
potentiometer.
Operation
Upon start signal, as
Ca
is closed, motor contactor C
1
closes, motor will operate and contact C
1-1
opens.
Upon stop signal, motor contactor C
1
opens, contact C
1-1
closes and initiates the braking process.
Contact Ca opens, preventing motor contactor operation,
and after time delay t1 contact C
b
closes, closing the brake
contactor C
2
.
The yellow LED on Solbrake / SMB's front panel will light
up indicating that brake contactor is closed.
After time delay of approx. 0.05 sec. DC current will be
injected to motors' winding.
The yellow LED on Solbrake / SMB's front panel will light
up indicating that braking current is now injected to the
motor.
The DC injection will automatically cease when motor
comes to a complete stop (when Automatic mode is
selected) and the yellow LED turns off.
Contact Ca closes after time delay t
5
, permitting motor
restarting.
6
M
L
1
L
2
U V W
C
1
C
2
O/L
1
2
C
1-1
SMB
Power
3
4
5
6
C
a
C
b
C
2-1
C
1-2
C
1
Start
Stop
O/L
C
1
C
2
SMB
Control
