AMETEK MX Series Rev: AY - Manual (Page 179)

User Manual - Rev AV AMETEK Programmable Power
MX Series 179
If the power system to be adjusted is an MX60, MX90 or an MX135, the procedure involves
matching the output voltage of the A, B and C power modules in the master cabinet to the A, B
and C power modules in the auxiliary cabinet(s). Proceed as follows:
1. Verify the controller is indeed set for 3-phase operation (MX60, MX90 or MX135).
2. Shut off all power to the cabinets. Disconnect the two wires going to Terminal 6 and Terminal
7 on the lower front of the power modules. Do this to module A, B and C in the auxiliary
cabinet(s) only. Place some temporary insulation over the lug ends.
3. Connect a DMM between terminals 6 and 7 on the A module in the master cabinet. Power
up the cabinet. Set the controller to the 300V range, program 230V at 60Hz. Enable the
output by pressing the OUTPUT ON/OFF key. Measure the A module output voltage and
write it down. Press the OUTPUT ON/OFF key to disable the output.
4. Move DMM leads to the B module terminals 6 and 7. Press the OUTPUT ON/OFF key to
enable the output. Measure the B module output and write it down, Press the OUTPUT
ON/OFF key to disable the output.
5. Move DMM leads to the C module terminals 6 and 7. Press the OUTPUT ON/OFF key to
enable the output. Measure the C module output and write it down, Press the OUTPUT
ON/OFF key to disable the output.
6. Move the DMM leads to the A module terminals 6 and 7 in the auxiliary cabinet. Press the
OUTPUT ON/OFF key again to enable the output. Verify the phase A module output is within
50mVolts of the A module in the master cabinet. If it is not, adjust the pot behind the hole in
the upper left corner of the module so the A output matches the A master output within
50mVolts. Press the OUTPUT ON/OFF key to disable the output.
7. Move the DMM leads to the B module terminals 6 and 7 in the auxiliary cabinet. Press the
OUTPUT ON/OFF key again to enable the output. Verify the phase B module output is within
50mVolts of the B module in the master cabinet. If it is not, adjust the pot behind the hole in
the upper left corner of the module so the B output matches the B master output within
50mVolts. Press the OUTPUT ON/OFF key to disable the output.
8. Move the DMM leads to the C module terminals 6 and 7 in the auxiliary cabinet. Press the
OUTPUT ON/OFF key again to enable the output. Verify the phase C module output is within
50mVolts of the C module in the master cabinet. If it is not, adjust the pot behind the hole in
the upper left corner of the module so the C output matches the C master output within
50mVolts. Press the OUTPUT ON/OFF key to disable the output.
9. If power system under adjustment is an MX135, then repeat steps 6, 7 and 8 above for the
second auxiliary cabinet.
10. Power down system and replace the wires to terminals 6 and 7 on the auxiliary power
modules.