10 • MultiFlex CUB-II and CUB-TD I&O Guide
026-1705 Rev 7 06-APR-2010
4.1.2. Power Connection
If power is needed to operate the sensor, four
points are provided on the MultiFlex board that
supply DC power: one +12VDC point, and three
+5VDC points. See
Figure 4-3
for the location
of these points.
To connect to one of the DC power sources,
simply connect the sensor’s power wire to one of
the terminals.
A sensor that requires 24VAC can be pow-
ered off the MultiFlex’s own 24VAC power con-
nection. To connect to the 24VAC power source,
connect the sensor’s power wires to terminals
AC1 and AC2.
4.1.2.1.
Current Ratings for On-Board
Power Sources
The maximum current that may be drawn
from the +12VDC terminal is 100 milliamps.
The maximum current that can be drawn from
all three +5VDC terminals COMBINED is 50
milliamps.
4.1.2.2.
Powering Sensors Requiring
24VAC Off the Power Transform-
er
Some sensors that requires 24VAC can be
powered off the MultiFlex’s own 24VAC power
connection. To connect to the 24VAC power
source, connect the sensor’s power wires to ter-
minals AC1 and AC2.
This can only be done with sensors that keep
the 24VAC signal isolated from its DC output
signal (such as CPC’s Dewpoint Probe). If the
output signal is not isolated from the 24VAC
input, you must use a separate transformer.
4.1.3. MultiFlex CUB Fixed Input Lo-
cations
The MultiFlex CUB supports a large number
of different types of input sources that might be
found on a single condensing unit’s pressure
control, condenser control, or refrigeration con-
trol systems. Because input locations are speci-
fied by the user in the system software, you can
connect inputs from the condensing unit to any
point on the CUB. However, to make setup eas-
ier, the CUB has assigned default sensor loca-
tions to a few of the inputs on the board.
Table 4-1
lists the inputs with assigned
defaults. If you choose to not use the defaults
listed, you may change any or all of them in the
system software (see
Section 7.3.3., Screen 3:
Inputs
and
Section 8.2.7., Input Setup Screens
).
Figure 4-3 - Input Board Power Sources
CUB Input
Point
Number
Label
Sensor to Connect
To This Point
1
Suction
Transducer
0-100PSI Pressure
Transducer, measuring
suction pressure
2
Discharge
Transducer
0-500PSI Pressure
Transducer, measuring
discharge pressure
3
Oil Trans-
ducer
0-200PSI Pressure
Transducer, for measur-
ing oil pressure
4
Case 1
Temp
Discharge air tempera-
ture sensor for the
cooler or case lineup
16
Alarm
Reset
Digital contact closure
(switch or push button)
to reset alarms
Table 4-1 - CUB Default Inputs
