PRT-PX16-PCB
Protege 16 PGM Output Expander
Installation Manual | June 2017
9
The battery test procedure uses a special algorithm to prevent deep discharge and increase battery endurance.
A dynamic battery test is performed every ten minutes when AC power is present and a battery condition alarm
will be generated if the battery is either disconnected or shows poor capacity. Battery fault conditions will
activate the battery trouble zone associated with the address assigned to the PGM Expander.
If AC is not present the Protege PGM Expander will monitor the battery for a low voltage level and will activate
the battery trouble zone. The next dynamic battery test will occur 30 minutes after AC power has been restored.
This delay allows the battery to achieve optimal charging during the first 30 minutes when power is initially
restored to the unit. Once the first test is completed the dynamic battery testing will return to 10 minute
intervals.
When power is first applied to the Protege PGM Expander a dynamic battery test will be performed after 30
seconds, this allows the status and condition of the battery to be detected. On completion of this first test the
normal testing period of 10 minutes will be resumed.
2.7
Status Indicator
The status output will activate according to the status indicator on the Protege PGM Expander and can be used
to provide signalling or indication of the PGM Expander status outside the enclosure. The following diagram
shows the connection of an LED indicator to the status output.
1K5 OHM
LED
AC
AC
ST
TP
TP
+12V AUX
External Status LED Connection
2.8
Encrypted Module Network
The Protege PGM Expander incorporates encrypted RS-485 communications technology. The isolated
communications interface offers full galvanic isolation to prevent ground loop noise and cross phase ground
differential between network devices.
NA
N+
N-
NB
Network communicaons input
from the Protege Integrated
System Controller or previous
Protege module
Standard Communication Connection
Connection of the communications should be performed according to the diagram shown above. It is important
that the N+ Network Communications Power be supplied from an independent battery backed power supply
unit or a networked module capable of supplying the required voltage to all devices on the RS485 network.
