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Chapter 2: Installation
POWER
EG 24 24 BAT C 20V C 15V C 12V C 5V C
AC AC
20 - 24 VAC
1.5 A
transformer
120 VAC
supply
primary secondary
Wiring an AC power supply to ISACC
DC supply requirements:
1. The voltage range for powering ISACC is 24 to 28VDC. If the voltage is lower
than 24VDC, the batteries will not fully charge. If the voltage is over 28VDC, excess
heat will be generated in the power supply and components may fail.
2. The DC supply should be able to provide a minimum of 1.5 Amp at the required
voltage.
3. The negative terminal on the DC supply must be either floating or connected to
"Earth Ground." If it is not, you will create a ground differential between ISACC,
your computer, and your sensors that may seriously damage these devices.
4. The positive terminal should have a 1.5 Amp Slo Blo fuse in-line between the
supply and ISACC. This is required because the fuse on the circuit board will be
bypassed with the new wiring.
DC supply connections:
1. Connect the negative wire from the DC supply to one of the common terminals
on the POWER terminal block.
2. Connect the positive wire from the DC supply (with the in-line fuse) to the termi-
nal marked 24AC that is directly to the right of the EG terminal.
See diagram next page.
POWER
EG 24 24 BAT C 20V C 15V C 12V C 5V C
AC AC
24 -32VDC
power supply
+
-
1.5 Amp
fuse
Wiring a DC power supply to ISACC