GE LOGIQ E9 Service Manual page 223

GE H
EALTHCARE
D 5180263-100, R
IRECTION
5-7-3 Power Up Sequence Description
5-7-3-1 Overview
The Power Up Sequence can be divided in the following steps:
1.) Switch AC Breaker to ON position
2.) Press the ON button on the Operator Panel
3.) BEP power-up
5-7-3-2 AC Breaker to ON position
Figure 5-13 Power On Sequence
1.) BEP, powered by 5Vstb, detects contact of Power-On Button.
2.) BEP sends PSON_N low to the Main Power supply.
3.) Main Power supply powers up +48V.
4.) Main Power supply powers up +24V, ±15V, ±6V, +11V.
5.) Main Power supply provides 48V_OK as soon as +48V is within specification.
6.) BEP Power supply Provides PC voltages from +48V.
7.) BEP enumerates PCI. (note that GFI DSP, or MRX DSP and PCI Express bridge must be powered
before BEP enumerates PCI).
8.) BEP application software controls +24V, ±15V, ±6V, +11V via USB (RackPower 0x6A).
9.) BEP application software controls TSV1and TSV2 via USB (SetTxPS 0x68).
10.)Main Power supply provides TS_OK and TS_LEVEL_OK output signals to GFI or MRX.
5
EV
M
a +24V
i +/-15, +/-6, +11V
Chapter 5 Components and Functions (Theory)
BEP
Op I/O
Power On
PSON_N
PSON_N via BEP
(5Vstb)
M
a
+48V
n
48V_OK
M
a
PC Voltages
n
BEP
PS-OK
BEP
enumerates PCI
TS Voltage USB
TS_OK
TS_LEVEL_OK
LOGIQ E9 S M
ERVICE ANUAL
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