Embraer EMB145 Operation Manual page 202

GPU POWER (NO APU)
Internal Safety Inspection ............................................. COMPLETED
Batteries 1 and 2 .......................................................... AUTO
Immediately after the batteries are switched ON the aural message
"AURAL UNIT OK" can be heard.
Avionics Master 1 or 2 .................................................. ON
Batteries Voltage .......................................................... CHECKED
If battery voltage is below 19 V it must be replaced. If battery
voltage is below 24 V report to the maintenance personnel or
recharge the affected battery by using the generators. In case of
recharging, it is recommended that battery 1 be turned OFF before
GPU disconnection. After GPU disconnection wait 3 minutes then
select battery 1 to AUTO.
While GPU is ON, batteries will not be recharged.
For cold soak operation, refer to Operation In Icing Conditions
section.
GPU Voltage................................................................. CHECKED
Check in the ELEC page, on the MFD, if the voltage is within 28.0 V
(-2.0 V +1.0 V).
GPU .............................................................................. ON
When GPU button is selected, the "GPU AVAIL" message on it
goes off and its yellow stripe lights up.
REVISION 37
AIRPLANE
OPERATIONS
MANUAL
NORMAL PROCEDURES
Page
1-02-13 7
Code
01