TCI HGA Manual - Manual (Page 53)

53
Warning
Only qualified electricians should carry out all electrical installation and maintenance work on the
HGA.
Disconnect all sources of power to the drive and HGA before working on the equipment. Do not
attempt any work on a powered HGA.
This HGA unit contains high voltages and capacitors. Wait at least five minutes after disconnecting
power from the filter before you attempt to service the conditioner. Check for zero voltage between all
terminals on the capacitors. Also, check for zero voltage between all phases of the input and output
lines. All maintenance and troubleshooting must be done by a qualified electrician. Failure to follow
standard safety procedures may result in death or serious injury. Unless an external disconnect means
has been provided everything ahead of the filter circuit breaker, including the reactors, will still
be energized.
Required Equipment
• AC voltmeter and ammeter or multimeter designed for true RMS measurements in a
harmonic rich circuit and suitable for the rated current and voltage marked on the
nameplate. The meter should have 1000 volt minimum isolation.
• Clamp-on current probe suitable for the rated current and voltage marked on the
nameplate.
• Clip-on voltage probes suitable for the rated voltage marked on the nameplate Select
probes that can be securely clipped on to the test points without shorting between
points or falling off.
Note: when disconnecting wires from components and terminations, mark the wires to
correspond to their component and terminal connection. Extreme Care should be taken when
removing the fast-on terminals from the circuit board. Excessive force will result in damaging
the interface board and require the converter to be repaired by TCI authorized personnel only.