Lithium Battery - ABB RMC-100 Startup Manual

5.3 Powering with external power
The controller can be powered from an external power supply (9 to 30 Vdc).
IMPORTANT NOTE: Make sure that the external power supply meets
the specifications in section 2.3, External power supply requirements.
WARNING – Equipment damage. A battery cannot be used when the
controller is in the EXT PWR mode.
To wire an external power supply to the controller:
1. Follow the manufacturer's instruction supplied with the external power supply to
install and connect it to a power source.
2. Connect the external power supply cable to the CHARGER/EXT PWR terminals
as shown in Figure 10. Observe the polarity (+ and -).
3. Apply power to the external power supply.
4. Confirm that the RMC is receiving power by observing the power on sequence
information scrolling on the LCD (see details in section 5.1, Power on
sequence). When the DATE/TIME display the sequence is complete.
5. If the power on sequence fails to initiate or complete, press the reset button
shown in Figure 11.
5.4

Lithium battery

The lithium battery serves to retain operation of the real time clock with the lithium
battery backup switch. The switch is located between the TFIO ports and accessed
by a slot in the housing. Lift the cover over the TFIO ports to view the switch settings.
The two settings are:
Enable - The switch is on. The lithium battery backs up the real time clock. If power
is lost or disconnected, the real time clock continues to operate until the lithium
battery is depleted.
18 | 2105551-001 rev. AC
BAT CHARGER/EXT PWR
Figure 10: External power supply connection
External
Power
Supply