ROC800-Series Instruction Manual
3-8 Power Connections Revised July-2017
3.1.4 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 to 22 AWG 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.
Figure 3-7. Auxiliary Power Wiring for PM-12 Module
For the 24 volt dc Power Input module (PM-24), the AUX voltage is
always 12 Volts dc minus ~0.7 Volts. AUX+ / AUX– is internally
current-limited by a 0.5 Amp Positive Temperature Coefficient (PTC).
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