Motortronics
Page 24
5.3 Brake Time Setting
Factory Setting: 7 seconds
The brake time is programmable from 1 to 127 seconds. Set the switches marked "Brake Time" to the brake
time required. Typical brake time settings should be 1/2 of the load's coast-to-stop time or less, as necessary.
Each dip switch represents a binary time value. Add the times together for the final brake time setting
Example:
Setting dip switch positions 1, 2, and 3 to "ON" = 1+2+4
= 7 seconds total brake time.
NOTE:
Stop times shorter than 4 seconds will not allow enough time for the Zero Speed Sensing circuit to
accurately sense that the motor has stopped. Brake Time must be used to turn the ABC Series off (t-2
seconds) to insure proper stopping.
5.4 Brake Current Setting
Factory Setting: 50% of Unit Rating
It is strongly recommended that you try the factory settings first be- fore making any adjustments. If adjustments
are necessary, a "true" RMS AC clamp-on ammeter should be used to check the current supplied to the motor
while braking. Place the meter on one of the ABC Series' input power lines. Start the motor by energizing the
motor starter contactor. Allow the motor to come up to full speed with the normal load. Engage the brake by de-
energizing (stopping) the motor starter contactor. Then, increase the brake current, if necessary, by slowly
adjusting the brake torque potentiometer (P1)(located in the Operation Interface Module) in a clockwise direction.
The braking torque should be adjusted so that the braking time expires at the same time the motor stops. Adjust
the brake current and/or brake time until acceptable. Start and stop the motor several times to verify proper
operation.
WARNING!
Never exceed the RMS full load current rating of the motor without first checking with the motor manufacturer for
the maximum allowable amount of DC current that can be supplied to the motor during braking application.
On
1 2 3 4 5 6 7
Switch Positions
Brake Time
1 2 4 8 16 32 64
Time (sec.)
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
