User Manual – Rev BE AMETEK Programmable Power
MX Series 54
CAUTION: Capacitors in the power source may hold a hazardous
electrical charge even if the power source has been
disconnected from the mains supply. Allow capacitors to
discharge to a safe voltage before touching exposed pins of
mains supply connectors.
Power modules need at least 15 Minutes to discharge to safe
levels before they can be removed.
3.5 AC On/Off Circuit Breaker on MX Series Front Panel.
It is important to understand the purpose and operation of the On/Off circuit
breaker of the MX Series located on the lower left side of the front panel. This
is a 2A rated breaker that is used to engage and protect the LV Power supply of
the MX chassis only. The LV Power supply provides DC bias power to the entire
MX system. The AC input power is routed through a set of three AC line fuses
(F1, F2 and F3) located in the lower left bottom corner of the MX. (See Figure
3-2 for fuse locations). These fuses protect the three MX amplifiers and the AC
input transformer from excessive input currents. The AC input power is
connected to the input transformer through a large three-pole contactor.
Removing AC power to the LV Power Supply by opening the front panel circuit
breaker (moving the lever to the down (OFF) position) will cause this contactor
to lose its coil voltage and will result in it opening and disconnecting the input
transformer and amplifier from AC mains input.
NOTE: If any MX system failure has occurred on any part of the MX
system, AC input power must be removed immediately and not
restored until the system has been inspected by a qualifier
service technician.
Always turn off the front panel ON/OFF Circuit breaker before
re-application of AC input power.
CAUTION: The AC input fuses can only be checked is the MX unit is
completely de-energized and disconnected from any AC power
input.
NOTE: Under no circumstances should AC input power be applied if one
or more of the AC input line fuses have failed and opened.
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