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ROC827 Instruction Manual
Issued Mar-06 Power Connections 3-3
Table 3-1. 12 Volt dc Power Input Terminal Block Connections
Terminal Blocks Definition Volts DC
BAT+ and BAT–
Accepts 12 Volts dc nominal from an
AC/DC converter or other 12 Volts dc
supply.
Absolute Maximum: 11.25 to 16 Volts
dc
Recommended Operating Range:
11.25 to 14.25 Volts dc
CHG+ and CHG–
Analog Input used to monitor an external
charging source.
0 to 18 Volts dc
AUX+ and AUX–
Supplies reverse polarity protected source
voltage to external devices. Fused.
BAT+ minus ∼0.7 Volts dc
AUX
SW
+ and AUX
SW
–
Supplies switched power for external
devices.
0 to 14.25 Volts dc
Table 3-2. 12 Volt DC Power Input LED Fault Indicators
Signal LED
V
OK
Green LED on when voltage is in tolerance on BAT+ and BAT–.
V
OFF
Fault – Red LED on when the AUX
SW
+ output are disabled by
the CPU control line.
V
OVER
Fault – Red LED on when AUX
SW
+ is disabled due to excess
voltage on BAT+.
TEMP
Fault – Red LED on when AUX
SW
+ output are disabled due to
the excess temperature of the Power Input module.
3.1.2 24-Volt DC Power Input Module (PM-24)
Using the PM-24, the ROC827 can accept 24 Volts dc (nominal) input
power from an AC/DC converter or other 24 Volts dc supply connected
to the + and – terminals. Connect the input power to either or both of the
+ and – channels. The 24 V dc Power Input module (PM-24) does not
have CHG terminals for monitoring a charging voltage, and does not
monitor the input voltage for alarming, sleep mode, or other monitoring
purposes. The module has two LEDs that indicate voltage is received at
the backplane and the CPU (see Figure 3-2 and Tables 3-3 and 3-4).
The base system (CPU, power input, and backplane) requires less than 70
mA. The Power Input module economizes power consumption using 3.3
Volts dc switching power that provides power to the I/O and
communications modules installed in the ROC827 and any expanded
backplanes. With this Power Input module installed, the ROC827 requires
20 to 30 Volts dc for proper operation.
Use the AUX+ and AUX– terminals to supply reverse polarity protected
source voltage to external devices, such as a radio or solenoid.