Braking torque
Determines the value of DC current the SI-DCB injects to
the motor. The SI-DCB can produce a braking current of
up to four times motor's nominal current.
A too high setting may cause a fast stop and high
mechanical shock. A too low setting may result in
prolonged time until motor stops.
Braking Time
* For Automatic Time-out - The setting on the front
panel determines the period of time during which the
braking contactor is closed. DC current ceases
automatically when the motor stops (Factory
default internal Dip Switch setting).
* For Manual Time-out - The setting on the front panel
determines the period of time during which
DC current is injected to motor windings, regardless of
when the motor stops (can be modified with the
internal
Dip Switch).
LED Display
The Green LED indicates that power supply is connected
to the SI-DCB (L1, L2).
The Yellow LED indicates that contactor Cbr is closed.
Motor restart is disabled when this LED is lit.
The yellow LED indicates that DCcurrentisbeinginjected
in the motor windings.
During start-up the dip switch should be in the Offposition
for Automatic Time-Out.
1. Set Braking Torque to 5
2. Set Braking Time to 10
3. Start motor and wait until it reaches full speed.
4. Stop motor and check the braking procedure.
a If braking has ceased and motor is still turning,
increase braking Torque setting and try again.
b If motor has stopped and the Yellow LED remains
on, decrease Braking Time setting until the Yellow
LED turns off shortly after the yellow LED has
turned off.
Note: Set Braking Time potentiometer t3to a slightly
longer time than the time required for motor to come to a
complete stop, even if the brake operates in an Automatic
mode. This is required for two reasons:
1. Ensuring that even if the automatic time-out
circuit did not sense that motor had stopped,
the DC injection will cease shortly after motor
stopped preventing excessive heating.
2. During time delay t3, braking contactor
remains closed even if the Automatic Time-
Out circuit has stopped the DC current.
Measuring the Braking Current
Approximate measurement of the braking current can be
made with a true RMS ammeter.
Trouble Shooting
1. Disconnect Mains voltage and check that contacts 3-4
and 5-6 are open.
2. Connect power to L1and L2. The green LED (On)
should light up.
3. Check that contact between terminals 3-4 is closed.
4. Check that contact between terminals 5-6 is open.
5. Start the motor. Motor contactor should close. If it
doesn't, check connection to contactor.
6. Press Stop button; motor contactor should open and
brake contactor should close after a short time delay.
Simultaneously the Braking Time and DC injection
LEDs should be lit. If LEDs do not light up, check that
auxiliary contact of Mains contactor connectedbetween
control terminals 1-2 is closed.
