Maintenance/Troubleshooting - Supervision related problems
Intelli-FLEX II product guide • • • a - 5
5. If a voltage within the range specified in step 4 is read, and a sensor line
supervision alarm persists there is a problem with the processor board.
12 volt low supervision
A 12 volt low supervision alarm occurs when the DC voltage on the VDD line
drops below 10.0 volts. The 12 volt low supervision alarm should clear, when the
VDD line voltage is greater than 10.5 volts DC.
Indication
A 12 volt low supervision alarm is indicated on the processor board when the
normally-closed contacts on the supervision alarm relays for both zones close.
Both amber
Supervision
LEDs on the processor will light.
A 12 volt low supervision alarm is indicated on the Configuration module when
the display reads
dc
and both
Zone 1
and
Zone 2
LEDs are lit.
Conditions
If 12 volt low supervision alarm does not occur when VDD voltage falls below 10
volts proceed as follows:
1. Check that jumper cap JP5 is in place between pins 1 and 2. This jumper cap
must be in place to report an DC 12 volt low condition.
2. If a 12 volt low supervision alarm does not occur when VDD voltage is less
than 10 volts and jumper cap JP5 is in place, there is a problem with the
processor board.
If a 12 volt low supervision alarm occurs when DC Power Distribution voltage is
presumed to be applied:
1. Measure DC voltage at TB1 terminals 1, and 2. The DC voltage must be
greater than 18 VDC for the supervision alarm to clear.
2. If a voltage greater than 18 VDC is measured in step 1, and the supervision
alarm persists there is a problem with the processor board.
Tamper supervision
A tamper supervision alarm occurs when the door of the enclosure that houses
the Intelli-FLEX II processor is opened. When the door is tightly closed, a small
magnet is held close to a Hall-effect sensor. The output from the sensor to the