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MicroHarmony Cell Sizes 40 - 260A Manual
Safety Precautions and Warnings
MicroHarmony Power Cells are designed with considerable thought to personal safety. However, as with any piece of
high power equipment, there are numerous internal connections that present potentially lethal voltages. In addition,
some internal components are thermally hot to the touch. Follow the warnings below when working in or near a
MicroHarmony Power Cell.
Danger - Electrical Hazards!
•
Always follow the proper lock-out/tag-out procedures before beginning any maintenance or trouble-
shooting work on the drive.
•
Always follow standard safety precautions and local codes during installation of external wiring. Pro-
tective separation must be kept between extra low voltage (ELV) wiring and any other wiring as spec-
ified in IEC6180-5-1.
•
Always use caution when handling the cell chassis. Even though sharp edges are deburred, the edges
can cause lacerations. Protective gloves are recommended when handling the cell.
•
Always work with one hand, wear insulated or rubber safety shoes, and wear safety glasses. Also,
always work with another person present.
•
Always use extreme caution when handling or measuring components that are inside the enclosure. Be
careful to prevent meter leads from shorting together or from touching other terminals.
•
Use only instrumentation (e.g., meters, oscilloscopes, etc.) intended for high voltage measurements
(that is, isolation is provided inside the instrument, not provided by isolating the chassis ground of the
instrument).
•
Never assume that switching off the input disconnect will remove all voltage from internal compo-
nents. Hazardous voltage is still present on the terminals of the input disconnect. Also, there may be
voltages present that are applied from other external sources.
•
Allow at least 5-8 minutes after disconnecting power before accessing the cell. The DC Bus capacitors
must discharge through the bleeder resistor after the main is disconnected. A DC bus indicator light is
located at the front of the cell on the cell control board, and will stay lit at bus voltages greater than
50VDC.
•
Never touch anything within the chassis or anything within the cell until verifying that it is neither
thermally hot nor electrically alive.
•
Never remove safety shields (marked with a H
beneath the shields.
•
Never run the drive with cabinet doors open. The only exception is the control cabinet which contains
extra low voltages (ELV).
•
Never connect any grounded (i.e., non-isolated) meters or oscilloscopes to the WCIII system.
•
Never connect or disconnect any meters, wiring, or printed circuit boards while the drive is energized.
•
Never defeat the instrument's grounding.
•
Only qualified individuals should install, operate, troubleshoot, and maintain this drive. A qualified
individual is "one familiar with the construction and operation of the equipment and the hazards
involved."
•
Hazardous voltages may still exist within the cell cabinet even when the disconnect switch is open
(off) and the supply power is shut off.
19001467: Version 1.0
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Safety Precautions and Warnings
sign) or attempt to measure points
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