QM range App Note, document number 260283, rev 15
Page 23 of 48
YF Modules
The output voltage can be adjusted from the factory set point
across the range shown in the datasheet by performing the
following operation:
Apply AC power
Individually adjust both potentiometers, situated to the
right of the signal connectors, so that the output voltage of
each board assembly is 50% of the desired output
voltage. Turning the potentiometer clockwise increases
the output voltage.
Confirm that the module has the desired output voltage
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. Connect J1 Pin 8 to J2 Pin 7.
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 output set voltage. The transistor is on when the output is “good”.
It is highly recommended to connect a 1uF 50V X7R ceramic capacitor between J1 Pin 3 and J2 Pin 4. This will
avoid a voltage spike / false triggering of the Module Good signal during turn on. This is due to the series
connection of the Module Good signals in the Y modules.
