OM-2245 / Operation and Maintenance Manual
ITW GSE 4400 / 400 Hz. Generator Set
March 15, 2015
Appendix A
Page 2
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.
Input Contactor(Q3):
The 400 Hz input power to the ARU is supplied and controlled via Q3.
Power Supply (G20):
24 VDC / 10 A (Factory adjustment = 25 Volt) regulated control voltage
is supplied from the Power Supply
G20. This module has a wide input range (340-575 VAC). It is supplied via the capacitor module and pre-
fused from the 3-phase circuit breaker Q4 (shared with G1) and located in 400 Hz part.
Refer to Figure 16.0.1.for location diagram.
ARU Transformers (T20):
The ARU transformers steps down the 3 phased 400 Hz voltage (3 x 200 Vac) to an appropriate level for
obtaining 28 VDC at the output.
ARU Rectifier (PM20):
The output voltage is kept at 28 VDC by using thyristors, regardless of the input voltage level and the load.
ARU Board (A20):
The ARU Board interfaces with the processor board and the rest of the 28 VDC unit.
x
Supplied from G20 (X2)
x
Connection to ARU control input on A2 (X1)
x
Control of thyristors.
x
Measures the output voltage.
x
Interface for heatsink thermostat (X5)
x
Input for current transformer T20 (X6)
Resistor (R20):
The discharge resistor R20 is part of the output filter stage and discharges the capacitor C20, when the unit is
turned off.
Filter Capacitors (C20)
The output filter capacitors are also part of the output filter stage and secures that the AC ripple is kept to a
minimum, less than 2% at the output.
Fan (M20)
The fan M20 is part of the total forced cooling of the unit, the primary task for the fan is to cool down the
rectifier module. The air is drawn in via the filter grill on the left hand side of the base module. The ARU
transformers are cooled by the fans located in the 400 Hz part.
Содержание 4400
Страница 2: ......
Страница 48: ...OM 2245 Operation and Maintenance Manual ITW GSE 4400 400 Hz Generator Set March 15 2015 Chapter 1 3 Page 11 ...
Страница 49: ...OM 2245 Operation and Maintenance Manual ITW GSE 4400 400 Hz Generator Set March 15 2015 Chapter 1 3 Page 12 ...
Страница 50: ...OM 2245 Operation and Maintenance Manual ITW GSE 4400 400 Hz Generator Set March 15 2015 Chapter 1 3 Page 13 ...
Страница 60: ...OM 2245 Operation and Maintenance Manual ITW GSE 4400 400 Hz Generator Set March 15 2015 Chapter 1 3 Page 23 ...
Страница 61: ...OM 2245 Operation and Maintenance Manual ITW GSE 4400 400 Hz Generator Set March 15 2015 Chapter 1 3 Page 24 ...
Страница 112: ...OM 2245 Operation and Maintenance Manual ITW GSE 4400 400 Hz Generator Set This page is intentionally left blank ...
Страница 204: ...OM 2245 Operation and Maintenance Manual ITW GSE 4400 400 Hz Generator Set This page is intentionally left blank ...
Страница 211: ...OM 2245 Operation and Maintenance Manual ITW GSE 4400 400 Hz Generator Set This page is intentionally left blank ...
Страница 212: ......
Страница 213: ......