Non-Routine Calibration - California Instruments MX30-1 User Manual

User Manual - Rev AJ

6.5 Non-Routine Calibration

The non-routine calibration may involve removing the front or top cover of the power source.
Use extreme caution when performing any of these tasks while the system is connected to AC
mai ns and/or powered up.
6.5.1 Powe r Source Gain Adjustment
For any MX configuration that requires two or more amplifiers to be operated in parallel for
increased curre
equal current sharing. If an unbalance exists between amplifier outputs, one or the other
amplifier will de
power can be a
This procedure details the gain adjustment. G
already set correctly so this task should only be undertaken if an amplifier has been replaced or
if two MX units are to be combined that were not originally shipped from the factory as such.
To make this adjustment the front cover must first be removed in order to get access to the
power module output terminals. If the p
involves matching the output voltage of the B and C power modules to the A module. Proceed
as follows:
1. Verify the controller is indeed set for 1-phase operation.
2. Shut off all power to the cabinet. Disconnect the two wires going to Terminal 6 and Terminal
7 on the lower front of the power modules. Do this to module B and C only. Place some
temporar y insulation over the lug ends.
3. Connect a DMM between terminals 6 and 7 on the A module. 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.
4. Measure the A module output voltage and write it down. Press the OUTPUT ON/OFF key to
disable th e output.
5. Move the DMM leads to the B module terminals 6 and 7. Press the OUTPUT ON/OFF key
again to enable the output. Verify the phase B module output is within 50mVolts of the A
module. If it is not, adjust the pot behind the hole in the upper left corner of the module so
the B output matches the A output within 50mVolts. Press the OUTPUT ON/OFF key to
disable th e output.
6. Move the DMM leads to the C module terminals 6 and 7. Press the OUTPUT ON/OFF key
again to enable the output. Verify the phase C module output is within 50mVolts of the A
module. If it is not, adjust the pot behind the hole in the upper left corner of the module so
the C output matches the A output within 50mVolts.
7. Power down system and replace the wires to terminals 6 and 7 on the B and C modules.
MX Series
nt output, the amplifier gains ha
liver more current and may run
ttained.
ve to matche d as
into its current lim
enerally, MX units are shipped with the gains
ower s ystem t o be adjus
California Instruments
closely as po ssible to ensure
it prote ction before full output
ted is a n MX45-1, the procedure
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