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ROC800-Series Instruction Manual

Revised Jul-14

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.

Maximum Range: 11.5 to 16 Volts dc

Recommended Operating Range: 11.5

to 14.5 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.

0 to 14.25 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 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 ROC800 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 Power Input module uses 3.3 Volts dc switching power to provide

power to the I/O and communications modules installed in the ROC800

and any expanded backplanes. With this Power Input module installed,

the ROC800 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.