Emerson ROC827 Auxiliary Output AUX+ and AUX, Volt dc Power Input LED Indicators

ROC827 Instruction Manual

+ / –

AUX+ / AUX–

V12 LED

V3 LED

Figure 3-2.24 Volt dc Power Input Module

Table 3-3. 24 Volt dc Power Input Terminal Block Connections

Terminal Blocks	Definition	Volts DC
+ and –	Accepts 24 Volts dc nominal from an AC/DC converter	18 to 30 Volts dc
	or other 24 Volts dc supply.

AUX+ and AUX– Supplies reverse polarity protected source voltage to external devices. Fused.

+12 Volts dc minus ∼0.7 Volts dc

Table 3-4. 24 Volt dc Power Input LED Indicators

Signal	LED
V12	Green LED on when voltage is provided to backplane.
V3.3	Green LED on when voltage is provided to CPU.

3.1.3 Auxiliary Output (AUX+ and AUX–)

You can use the AUX+ and AUX– terminals to supply reverse polarity protected source voltage to external devices, such as a radio or a solenoid. All module terminal blocks accept 12 AWG or smaller wiring. Refer to Figures 3-3 and 3-4.

For the 12-volt dc Power Input module (PM-12), the auxiliary output follows the voltage located at BAT+ minus ~0.7 Volts dc, which is the protection diode voltage drop. For example, if the BAT+ voltage is 13 volts dc, then AUX+ is ~12.3 Volts dc.

For the 12-volt dc Power Input module, AUX+ / AUX– is always on and is current-limited by a fast acting glass 2.5 Amp x 20 mm fuse. In the event that the fuse blows, CSA requires that you replace the 2.5 Amp fast-acting fuse with a Little Fuse 217.025 or equivalent. Refer to “Automatic Self Tests” in Chapter 1, General Information.

Issued Mar-06 Power Connections 3-4