ZETRON 4000 Series Installation Manual page 34

Common Control Equipment Installation
Adding DC Backup

To use 12 V
1. Measure the voltage at the BATT terminal (on the front of the supply) relative to
GND.
2. Measure the voltage at the +12V terminal.
3. Turn the 12V ADJ potentiometer clockwise until the +12V voltage is at least 0.2V
higher than the BATT voltage.
Table 6: Power Support Voltage Selection
Adjusting the Power Supply
The test points on the front of the unit are used to monitor the voltage levels. The +12V
has been set at the factory for +13.5V
setting. The -12V
test point reads the common voltage in a two-power-supply system. Use the following
adjustment procedure to verify the voltage being read is the supply being adjusted.
Single Power Supply

To adjust a system with one power supply
• Monitor the +5V
reads 5.18V
• Monitor the +12V
reads 13.5V
34
as a backup to the AC supply
DC
Input Supply
Universal AC
12 V only
DC
AC and DC
supply has no adjustment and should be -11.7 ± 0.5 V
DC
Note The 5V supply has been adjusted to your system at the factory,
DC
but adding or removing cards changes the load and may require
you to adjust the 5V
test point and turn the ADJ potentiometer until the test point
DC
.
DC
test point and turn the ADJ potentiometer until the test point
DC
.
DC
JP1 JP2
YES NO
NO YES
YES YES
. There is an adjustment potentiometer for this
DC
value.
DC
DC
. The 5V
DC DC
025-9533Y