DC CONTROL PANEL CALLOUTS
1. STBY BATT switch (two position)
STBY BATT
- left main feeder bus charging circuit connected to standby battery
- EPCU logic inhibits this connection under the following conditions:
• with external power (no charge) option
• when a DC bus fault is present on the left main feeder bus
• during emergency operations
OFF
- disconnects standby battery from left main feeder bus
- STBY BATTERY caution light turns on any time the standby battery is not connected to
the left main feeder bus
2. AUX BATT SWITCH (two position)
AUX BATT
- left main feeder bus charging circuit connected to auxiliary battery
- EPCU logic inhibits this connection under the following conditions:
• with external power (no charge) option
• when a DC bus fault is present on the left main feeder bus
• during emergency operations
OFF
- disconnects auxiliary battery from left main feeder bus
- AUX BATTERY caution light turns on any time the auxiliary battery is not connected to
the left main feeder bus
3. MAIN BATT SWITCH (two position)
MAIN BATT
- right main feeder bus charging circuit connected to main battery
- EPCU logic inhibits this connection under the following conditions:
• with external power (no charge) option
• when a DC bus fault is present on the right main feeder bus
• during emergency operations
OFF
- disconnects main battery from right main feeder bus
- MAIN BATTERY caution light turns on any time the main battery is not connected to the
right main feeder bus
Dash8 - Q400 - Electrical
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