Operation Manual -
PoWerMaster®
2400 – 30 - 90 kVA
For GPUs with 28 VDC Active Rectifier Unit
Document no. 578.650BB
Page 78 of 91
12.0
For GPUs with 28 VDC Active Rectifier Unit
All Hobart
PoWerMaster®
2400 units from 30 kVA to 90 kVA can be equipped with a 28 VDC
A
ctive
R
ectifier
U
nit (ARU) output.
Both 400 Hz & 28 VDC outputs can be used simultaneously. The total continuous amount of power
from the unit is calculated as the sum of 400 Hz and 28 VDC output and cannot exceed the total 400 Hz
power rating of the unit.
12.1 General Description
12.1.1 Principle of 28 VDC ARU
The 28 VDC part is basically an Active Rectifier Unit and supplied from the 400 Hz part, where the 28
VDC output voltage is controlled regardless of the varying 400 Hz input voltage. The DC output current
is calculated very precisely on the basis of the 400 Hz parameters and via the current transformer T20,
located in phase A at the main power input.
Please refer to Figure 5.0.2 for outline drawings.
*
*
ARU
Board
(A20)
A
B
C
+
-
ARU
Transformers
X6
C20
R20
Rectifier
Module
M20
Power
Supply
(G20)
G20
X2
X1
X6
X5
°t
DISCHARGE
RESISTOR
FAN
FILTER
CAPACITOR
T20
ARU Module
*
Situated in the 400 Hz cubicle