6C.6 Brake Adjustment - O. Thompson Microflite Ultra 2000 Installation & Adjustment Manual

6c.6 Brake Adjustment
Note:
The brake assembly and all pins should be cleaned thoroughly and all spring
tensions set properly to hold 125% of car capacity prior to adjusting the brake
driver. Brake shoes should be checked to insure at least 95% surface contact. If
spring tensions are changed after this adjustment, the brake driver will need to be
completely re-adjusted.
1. Ensure the brake coil has been connected properly to the controller.
Connect a meter across the F- and F+ terminals of the drive. Set the meter range high
2.
enough to measure the brake lifting voltage level for the job.
With no inputs on at the J1 terminal of the drive, the V/I-4 pot will be selected. Adjust
3.
the V/I-4 pot fully counterclockwise.
Turn the main line power OFF. TEMPORARILY jump from J1-1 to J1-2 on the driver.
4.
5. Turn the main line power ON. Run the car on inspection and adjust the V/I-1 pot until
brake pick voltage required for the job is obtained.
6. Turn the main line power OFF. Remove the jumper from J1-1 on the driver.
7. Turn the main line power ON. Run the car on inspection and wait until the LED over
the V/I-2 pot lights. Adjust the V/I-2 pot until approximately 60% brake lifting voltage is
obtained or the brake holding voltage previously measured. If the brake drops at this
level, stop the car, turn the pot clockwise 1 full turn, and attempt to run the car again.
8. While running the car, turn the inspection speed pot counterclockwise until the car runs
at approximately 8-10 fpm.
9. Remove the RL relay.
Turn the V/I-3 pot 10 turns counterclockwise, and then 2 turns clockwise.
10.
Run the car on inspection and slowly turn the V/I-3 pot clockwise until the car runs
11.
through the brake.
Note:
The brake shoes should not lift completely off the drum. If the shoes lift
completely off the drum, stop the car. Turn the V/I-3 pot counterclockwise a
couple of turns and repeat step 11. If the brake shoes lift completely on re-level,
there may be insufficient torque in the hoist motor to assure adequate leveling
control.
Replace the RL relay.
12.
Turn the ACC1 pot fully clockwise. This will allow for a rapid response of the brake
13.
regulator from a lower voltage level to a higher voltage level.
Turn the DEC1 pot fully clockwise. This will allow for a rapid response of the brake
14.
regulator from a higher voltage level to a lower voltage level. This will also help prevent
excessive arcing on the contacts of the BK relay.
Revision: AA 2.2
Microflite Ultra 2000 - Amicon Regulator
Printed 03 - 15 - 03 6c - 10