Keri Systems SB-293 - Manual (Page 99)

Keri Systems, Inc. Technical Reference Manual – PXL-250 and SB-293
Revision 5.5 P/N: 01836-004 Page 99
12.2.2 Power/Voltage LED
The Power/Voltage LED (at the right side of the controller) is attached to a circuit that
monitors the voltage level received by the controller. In standard operation this LED is
green (meaning the power being provided to the controller meets the controller’s
power specifications.
If the LED is red, this means an under or over voltage condition exists that can affect
the operation of the controller. When an under or over voltage condition is detected,
the address display (see Figure 9-1 on page 39 and Figure 11-2 on page 93) shows the
voltage value detected by the controller. With a DVM, verify this voltage and make
corrections to the voltage source as necessary to bring the controller voltage back to 12
VDC.
12.3 Lock and Alarm LEDs
The Lock and Alarm LEDs reflect the status of the Lock and Alarm relays. When
these relays are not energized (their normal state) the LEDs are off.
When a door is unlocked (whether through a card presentation or manual operation),
the Lock LED turns green and stays green until the door is locked again.
When a door goes into an alarm state, the Alarm LED turns green and stays green for
the duration of the alarm state.