Watchdog Reset Reports; Runaway Reports To The Receiver; Overloaded Power Supply - Bosch D7412G Installation & Troubleshooting Quick Reference Manual

3.12

Watchdog Reset Reports

The panel sends a WATCHDOG RESET report whenever the panel's CPU (Central Processing Unit) is interrupted and has to
start its normal operating sequence over. The on-board buzzer sounds briefly during the Watchdog Reset. The panel returns
to normal operation immediately after resetting.
The most common cause of CPU interruption and WATCHDOG RESET reports is static discharge to the panel. Static
discharges may also corrupt the panel's program. The D9412G/D7412G/D7212G displays a PARAM FAIL message at the
command centers and sends PARM CKSUM FAIL report if the program is corrupted.
Shorting Terminals 3, 6, 7, 8, or 24, or the Programming Connector to ground may also cause a WATCHDOG RESET.
Remove the short to continue normal operation.
A single isolated WATCHDOG RESET report does not mean the panel must be replaced. If experiencing frequent reports,
contact Bosch Security Systems Customer Service for help.
Touch Terminal 10 first: If the on-board buzzer sounds briefly when the panel is first touched, any static charge that is being
carried is being discharged to the panel. The panel may generate WATCHDOG RESET and/or PARAM FAIL events. Always
touch Terminal 10, the panel's earth ground connection, before beginning work on the panel.
Note: Please note that a WATCHDOG RESET event may be reported after a panel has returned from repair. This is a
normal occurrence and does not necessarily indicate a problem with the panel.
3.13

Runaway Reports to the Receiver

Using the D8128 or D8128A in place of the D8128D OctoPOPIT Module may cause runaway reports to the receiver on AC
failure. Be sure to replace all D8128 or D8128A OctoPOPITS with the D8128D Module.
3.14

Overloaded Power Supply

If the load on the panel's power supply exceeds its capacity, the panel follows a routine to protect itself and the battery. It
sends reports to the Central Station at several points during this routine.
Keep in mind that AC power remains at Terminals 1 and 2 throughout the scenario that follows:
• The panel is operating normally with a good battery, AC is present at Terminals 1 and 2, and auxiliary power
load is under 1.4 A.
• Combined load on Terminals 3, 6, 7, 8, 24, and 32, the Accessory Connector, and the Programming Connector
exceeds and remains above 1.4 A. Device failure or premises wiring ground faults might cause the increased load.
• The panel begins drawing on the battery to support the increased load. The yellow Charging Status LED turns
on.
• The battery begins to drain. When voltage drops to 12.1 V, the panel sends a LOW BATTERY report and turns
on the red Low Battery LED.
• When the battery drops to 10.2 V the panel disconnects it to protect it from deep discharge.
• If AC is still present, the panel removes power to Terminals 3, 6, 7, 8, 24, and 32, and the Programming
Connector to protect its power supply. The green Operation Monitor LED turns off, but the panel is still
operating.
• The panel sends BATTERY MISSING, PT BUS TROUBLE, and SDI FAILURE reports.
• If a D928 Module is connected, it begins sounding.
• After approximately 60 sec. the panel attempts to return to normal operation by returning power to Terminals 3,
6, 7, 8, 24, and 32, and the Programming Connector.
• If the overload condition is still present, the panel removes power.
• The panel attempts to return to normal operation approximately every 60 seconds.
• The cause of the overload is removed. Combined load on Terminals 3, 6, 7, 8, 24, and 32, and the Accessory and
Programming Connectors remains below 1.4 A.
D9412G/D7412G/D7212G Installation & Troubleshooting Quick Reference Guide
© 2004 Bosch Security Systems, Inc.
D9412G/D7412G/D7212G
Page 17
Troubleshooting
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