A
C Tech ! 660 Douglas St. ! Uxbridge, MA 01569 ! Ph: (800)217-9100 ! Ph: (508)278-9100 ! Fax: (508) 278-7873
The following parts are included with the Dynamic Braking and Additional Form C Relay kits:
(1) Dynamic Braking Board (9935-XXX, or 9956-XXX) or Additional Form C Relay Board (9934-XXX or 9956-XXX)
(1) 7/16” Nylon sleeve standoff (1) 3/4” Nylon sleeve standoff
(2) Nylon “snap-in” standoff (7.5 HP, 480 Vac & 590 Vac kits only) (1) Nylon shoulder washer
(1) Resistor assembly (DB kits only)
WARNING!
Hazard of electric shock! Remove input power from the drive and wait three minutes before attempting this procedure. DC Bus
capacitors retain charge after power is removed.
The internal components of the MC Series drive can be damaged by electrostatic discharge (ESD)! Use an antistatic wrist strap
with the ground clip attached to the drive ground lug when attempting this procedure. Always place components on antistatic
surfaces or in antistatic bags when they are not being handled during this procedure.
1. Remove the drive cover.
2. Remove the keypad assembly. On NEMA 1 units, this is done by prying one end of the bracket up and out. On NEMA 4
or 12 units, remove the screws that hold the bracket in place. Then unplug the keypad ribbon cable from the Main Control
Board (9933A-XXX), being careful not to bend any pins.
3. Remove the Main Control Board by removing the four screws (one at each corner). Be careful to lift the board straight up
and out, as there are many pins connecting to the board from underneath that are easily bent.
Remove the 1-5/16” nylon sleeve standoff from the lower left-hand corner screw, and replace it with the 3/4” nylon sleeve
standoff from the kit.
There is a 2 x 6 pin connector that connects the P3 plug on the Main Control Board to the P3 plug on the Power Board
below. Leave this plugged into the P3 plug on the Power Board.
4. Under the Main Control Board is the Driver Board (9926-XXX) which needs to be removed to install the DB Board or
Relay Board. Remove the Driver Board by pinching the flared top of each nylon standoff while gently lifting up on the
board (leave the standoffs snapped into the Power Board underneath). Be careful to lift the Driver Board straight up and
out, as there are many pins connecting to the Driver Board from underneath that are easily bent.
NOTE: On 7.5 HP, 480 Vac & 590 Vac drives only, remove and save the 2 x 6 pin connector that is plugged into PL2 on
the Driver Board (another 2 x 6 connector may be included in the DB kit; only one is needed).
5. Slide the nylon shoulder washer through the 3/16” hole near the lower left-hand side of the DB Board or Relay Board, and
slide the 7/16” nylon sleeve standoff onto the shoulder washer from the bottom side of the board (see diagram).
NOTE: On 9956-XXX Boards only (7.5 HP, 480 Vac & 590 Vac drives), install the two nylon “snap-in” standoffs into the
holes at the bottom near the DB1 and DB2 terminals.
6. Snap the DB Board or Relay Board into place where the old Driver Board was, onto the same nylon standoffs that held the
Driver Board in place. Make sure that the PL1 pin connector (and the P8 and P9 spade connectors on DB Boards)
makes positive contact with their respective plugs, and be careful not to bend any pins.
NOTE 1: The 9956-XXX board (7.5 HP, 480 Vac & 590 Vac drives) also has a P11 connector on the bottom of the board.
Make sure that the P11 connector makes positive contact to the pins on the Power Board below.
NOTE 2: On 9956-XXX boards only (7.5 HP, 480 Vac & 590 Vac drives), install the 2 x 6 pin connector in PL2.
7. Re-install the Main Control Board. Make sure that the PL2 and P3 pin connectors make positive contact through the
bottom of the Main Control Board, and be careful not to bend any pins.
8. Re-install the keypad assembly and drive cover.
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