Philips epiq 5 - Page 35

EPIQ 5 & 7 Training Manual
© 2016 Conquest Imaging
27
Power Regulator Board Block Diagram
Other PRB functions include:
 Controls fan speed according to temperature conditions
monitored via the I
2
C bus by applying 10.2 to 13.8 Vdc in parallel
to all three system fans. Fan inrush current is limited to 3 Amps.
 To reduce system noise during CW operation multiple
416.667KHz clock inputs from the ACB are used to synchronize
the switching regulators.
 Passes three phase motor controller voltages from the backplane
to the Channel Board.
PRB
Fan
Temp
Control
PIC
HV
Supply
Fan
Channel
Board
BACK
PLANE
Power
Module
ACB
Motor
FAN_CTRL
24V
PWR_REG_ON
MOTOR_PHASE(3) MOTOR_PHASE(3)
+5.5AS,3.17A
+3.8AS,5.24A
+2.3AS,7.2A
-5.5AS,3.35A
+3.3SS,7.2A
+2.0DS,1.68A
+13SS,6.15A
-13SS,1.85A
GNDsense
PRB_PWR_GOOD
+HV_CBAS,100W,4A
HV+AS,1.5W,1A
HV-AS,1.5W,1A
HVDACcontrolvoltages(3)
HVgain(2)
HVenable(3)
ARGON_PREG_CLK_1-6
I2C_UTIL
I2C_DIAG
PIC_MCLR_POW_REG
PREG _SPARE(3)
The PRB also receives
sense line input from
the Channel Board for
the following analog
and digital supplies:
+2.0 DS, 2.7 A
+2.3 AS, 7.1 A
+3.3 DS, 2 A
+3.8 AS, 7.2 A
+5.5 AS, 3.5 A
Ground