Overload Module; Rectifier - Hobart 100D20 Operation And Maintenance Manual With Illustrated Parts List

OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets

(4) Rectifier

A diode-bridge rectifier (5, Fig. 13) receives 400-Hz AC from phase C of the generator output
and converts it to a pulsating, direct current for energization of the load contactor holding coil
only. This DC coil-holding circuit is controlled indirectly by the 400-Hz AC to the rectifier. The
ground circuit for the rectifier's AC supply must pass through the relay contacts in the protective
monitor module to ground cable N. Therefore, any time a protective device functions to open
the protective monitor relay, the rectifier's circuit is opened. No DC is then available for the load
contactor holding coil, hence, the load contactor opens.
1. Overload Resistor (16.6 Ohm, 25 Watt
for 90-kVA)
2. Terminal Board
3. Overload Current Transformer
4. Ammeter Current Transformer
5. Rectifier
March 31/94 Revised
6. Load Contactor

7. Overload Module

8. Line Drop Resistor (50 Ohm,
9. Line Drop Current Transformer
10. Blocking Diode
Power Module Panel Assembly
Figure 15
25 Watt)
Chapter 1-1
Page 23