5
Power
All of the devices attached to the Multi-Drop Box are normally powered through a common
power bus applied to the terminal block on the front of the box.
When power is supplied through the 4-pin terminal block, the input current must
not exceed nine amps.
Under some circumstances power may be supplied from a connected device.
If power
is being supplied from a connected device, the input current must not exceed
two amps.
The terminal block requires DC VOLTAGE, appropriate for the devices hooked up to the
box and of sufficient current to run all of the devices. (See table below.)
Positive DC voltage must be applied to the socket labeled “POWER” and the power
ground must be applied to the socket labeled “GROUND”. Connect the wires to the
terminal block by following the six steps previously listed.
Device
Voltage
(Vdc)
Current
(milliamps)
Meters and Gauges (all ranges)
7-30
50 mA each
0-20 SLPM Controllers and PC, PCD Series Pressure
Controllers
12-30
150 mA each
20+ to 100 SLPM Controllers
24-30
750 mA each
100+ to 1500 SLPM Controllers and PCR Series
Pressure Controllers
24-30
750 mA each
CAUTION! Do not apply AC voltage to the Multi-Drop Box terminal block or to
individual units as immediate damage will occur!
Do Not
power units individually through their AC/DC adapter jacks. Potential differences
between units could damage the power bus in the Multi-Drop Box or damage individual
units which may be supplied too much voltage.