Chapter Vi: Maintenance And Adjustment - Leviton Topaz 12 User Manual

IMPORTANT: Disconnect Pack from power source before performing any maintenance.
1. MAINTENANCE
The only maintenance which should be required on the TOPAZ 12 Pack is the occasional cleaning of the dimmer
modules and the tightening of the feeder bus bar lugs.
The cleaning of the modules is simply done by removing the module from the pack and blowing the dust out of the module
with compressed air. The modules should be cleaned every six months or sooner when the pack is used in an
environment that is particularly dusty. The control module should also be cleaned in the same manner as the dimmer
module.
The Bus Bar lugs should also be checked at the same time that the modules are cleaned. Using a 7/16" socket, check
the torque of all three phases lugs and the neutral lug.
2. ADJUSTMENT
IMPORTANT: This operation should only be attempted by a qualified electrical technician.
There are three phase trim adjustment screws on the front of the control module. Each of these phase adjustment screws
corresponds with a phase of the incoming feeder. Refer to Appendix D on Dimmer Phasing to find the corresponding
dimmer numbers. The simplest method of adjustment is through the use of an oscilloscope. If split phase, 3 wire, power
is being used, only phases A and C need to be accurately adjusted.
Note: If any phase is considerably out of adjustment with respect to the others, the microprocessor will not run. Take care
that the adjustment process does not render the module temporarily inoperable.
Phase Trim Adjustment Procedure:
1. Connect the scope probe to a Phase A dimmer output. This is best accomplished by using a load
receptacle plug. Note: Be sure to isolate the ground of your scope.
2. Apply power to the dimmer pack.
3. Turn on the Test Switch.
4. Look at dimmer output on scope. The wave should be sinusoidal.
5. While looking at the dimmer output wave form, turn the Phase A trim adjustment screw counter clockwise
until the wave starts to become chopped. Then slowly turn the adjustment screw clockwise until the wave
form becomes sinusoidal again. At this point the adjustment is complete. Continue in this manner to
calibrate the remaining phases.
Control modules are usually adjusted for 120V or 240V operation. For 100V or 220V operation it may be necessary to
readjust your modules. If you operate this Pack at 100V, the dimmer modules are derated to 2KW and 5KW. The ratings
of dimmer modules operating at 220V remain at 2.5KW and 5.0KW.

CHAPTER VI: MAINTENANCE AND ADJUSTMENT

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