User Manual – Rev BE AMETEK Programmable Power
MX Series 88
3.11 Basic Initial Functional Test
CAUTION: Work carefully when performing these tests; hazardous
voltages are present on the input and output during this test.
Refer to Figure 3-21 for the required functional test set up. Proceed as follows
to perform a basic function check of the power system:
Verify the correct AC line input rating on the nameplate of the MX unit(s) and
make sure the correct three-phase line voltage is wired to the input of the MX
before applying input power.
Connect a suitable resistive or other type load to the output of the MX. The load
resistance value will depend on the voltage range you plan to check. Make sure
the power resistor has sufficient power dissipation capability - up to 15 KW for
full load test on one phase of MX45-3 or 10 KW for full load test on one phase of
M30-3Pi - and that the load used does not exceed the maximum power rating of
the MX. For three phase configurations, this test can be performed on one
phase at a time if needed.
Connect an oscilloscope and DMM / voltmeter to the AC source output. Set both
for AC mode.
If the correct voltage is present, turn on the MX unit(s) by closing the On/Off
circuit breaker on the front panel. For multi-cabinet systems, turn on the
auxiliary unit first and wait for them to cycle on, then turn on the master unit.
If the MX has more than one available output voltage range, go to the
PROGRAM 1 screen and select the desired voltage range. The output mode can
be set from the PROGRAM 2 screen (use the MORE soft key or press the PROGR
function key again). Select AC mode.
Set the output voltage to 0 volt and close the output relay with the OUTPUT
ON/OFF button. There should be little or no output although the DMM may
show a noise level, especially if the DMM is in auto ranging mode.
Move the cursor to the VOLTAGE field in the PROGRAM 1 screen and either use
the keyboard to program a small voltage (20 VAC) or slew the voltage up slowly
with the knob. Observe the DMM reading. The reading should track the
programmed voltage.
Also monitor the scope. The output should be a sinusoidal voltage waveform.
If the output tracks, increase the voltage till you reach 80 % of the voltage
range or more. Check the output voltage reading and waveform.
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