User Manual – Rev BE AMETEK Programmable Power
MX Series 238
4) Carefully slide module outward and lift out of cabinet. Use
caution, module weighs 66 LBS (30Kg).
5) With the power module out of the cabinet and lying flat on a
bench, remove the screws on the bottom and sides of the left-
hand cover as seen from the front when module is installed
normally.
6) Inspect the three IGBT transistor modules Q1, Q2 and Q3 for
any visible damage.
7) Using an ohmmeter check the 30A fuses on the positive and
negative side of the power distribution board that connects the
four amplifier modules to the DC bus. If any of them are open,
then one or more of the amplifier sections has a damaged
device on the heat sink assemblies and the power module
assembly will have to be serviced.
7.4.6 Other No Output Conditions
If one or more outputs (phase A, B or C) do not produce an output, it may be
caused by an amplifier failure. Amplifier failures can either be input (PFC) or
output related (Amp). To determine if this is the case, the cover of the amplifier
must be removed. Contact customer service repairs.ppd@ametek.com
before
attempting to diagnose on your own.
PFC failure denotes one or all three of the IGBT power modules on the large PFC
heat sink have shorted and damaged the devices. This type of failure is
sometimes accompanied by a popping sound as the large PFC power devices
give out. To diagnose this failure mode, the amplifiers must be removed, and
the cover removed for inspection.
If there is any sign of damage, the PFC power devices must be replaced. If not,
they need to be checked for continuity using a DMM or diode checker.
In case of a PFC failure, older generation PFC control boards (7003-705 or
7003-712) may have sustained damaged in the isolated gate drive section of
the board and the board itself may have to be replaced. MX Systems with later
generation 7003-716 PFC control boards generally will only require replacement
of the 2A gate fuses to restore functionality.
If the PFC section looks intact, one of the output amplifier switches may have
shorted.
The usual scenario is one or two of the IGBT switch devices on one of the 4 heat
sinks get shorted. Usually if the B+ device is failed, the B- device will also
short. When these devices short, one or more of the 30A fuses (F1 through F8)
on the DC power distribution board will be open.
An amplifier device failure is not audible at all so there may be no indication of
this other than checking as follows:
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