QM range App Note, document number 260283, rev 15
Page 25 of 48
ZC Modules
The output voltage can be adjusted from the factory set point across
the range shown in the datasheet by performing the following operation:
Disconnect the AC power, then remove the two busbars
connecting the Ch1 + and Ch1 0V terminals together
Re-apply AC power
Apply the load specified in the module table below to each of
the modules which make up the Z module.
Individually adjust both potentiometers, situated to the right of
the signal connectors, so that the output voltage of each board
assembly is at the desired set point. Note: Each output voltage
must be /-0.25% of the desired point. Turning the
potentiometer clockwise increases the output voltage
Reconnect the two busbars and reapply AC power
Confirm that the module has the desired output voltage
Output voltage
range
Load to apply while adjusting output
Left hand module
Right hand module
15-16V
300W
300W
18-19.2V
300W
300W
28-29.9V
300W
300W
The remote sense provides compensation for a maximum total load cable drop of 0.5V for the output. The
voltage at the output terminals must be within the specified adjustment range. See the Remote Sense section in
the POWER SUPPLY OPERATION chapter for connection advice.
Signals
The Module Good signal is an isolated (200V from the output) opto-coupler transistor output. The maximum
current allowed through the transistor is 1mA. This signal provides an indication that the output is above 90% of
the out
put set voltage. The transistor is on when the output is “good”.
