Operating Instructions

Chapter 4—Troubleshooting
Troubleshooting Compact Field Panels
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118
Siemens Industry, Inc.
Owner's Manual
553-104
Building Technologies
2018-10-01
BATT LOW LED
The BATT LOW LED is on or the battery low warning is displayed at the
operator's terminal.
CAUTION
If you do not have a current backup, save the database before continuing.
1. Check that the mylar insert was removed from the AA (LR6) battery holder.
2. Check for polarity (+ to +) and (- to -).
3. Check that the battery is properly seated in the battery holder.
4. Replace the battery.
BATT LOW LED remains on after the battery has been replaced.
 Verify that the correct type of battery is being used. The LOW BATT LED remains
ON if an alkaline battery is used in PXC Compact models with extended
temperature range operation.
CAUTION
Only use a 3.6 Volt lithium battery in PXC Compact models with extended
temperature range operation.
Only use a 1.5 Volt alkaline battery in standard PXC Compact models.
• The 3.6 Volt lithium battery is designed to operate at both high and low temperature
extremes, and it provides a long service life in an extended temperature environment.
• The 1.5 Volt alkaline battery is not guaranteed to provide backup protection in
models with extended temperature range operation, even if the controller is operating
in a room-temperature environment.
• If a 3.6 Volt lithium battery is used in standard PXC Compact models, the battery
quickly discharges and provides much less backup protection than a 1.5 Volt alkaline
battery.
RUN LED
The RUN LED is on solid.
 The RUN LED is steadily lit during normal operation to indicate that 24 Vac power
is ON and the application firmware has booted.
The RUN LED is ON. No communication is possible with the HMI port.
1. Verify that HMI port and your terminal are set to the same communication speed.
– The factory-default communication speed of the PXC-16 and PXC-24 HMI port
is 9600 bps.
– The factory-default communication speed of the PXC-36 HMI port is 115.2
Kbps.