Hobart 6921 Series, Operation And Maintenance Manual

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c. Overload current transformers
Three overload current transformers (3) , in conjunction with burden resistors (1) , monitor the
output load current in each of the three output phases, and supply a reduced value current
signal to the overload module
(7) .
(3) Overload module
The overload module (7) is a solid-state device designed to interpret a signal from transformers
(3) and to send a signal to the protective monitor module (4, Fig. 10) when an overload
condition exists in any generator output phase. A pull-apart electrical connector is mounted on
the overload module to provide quick-disconnect facilities for all wiring to the module. The
overload module is equipped with a hermetically-sealed, reed-type relay. Relay contacts are
normally open.
1. Resistor (1000 Ohms, 25 Watts)
2. Regulator Rheostat
3. Cable Length Compensation Rheostat
4. Cable Size Compensation Rheostat
5. On-Off Switch, Line Drop Compensation
6. Line Drop Compensation, Chasses Assy.
7. Receptacle Connector
8. Damping Circuit Gain Potentiometer
9. Receptacle Connector
10. Damping Circuit Rate Potentiometer
11. Receptacle Connector
12. Fuse (5 Amp)
13. Fuseholder
14. Receptacle Connector
15. Sensing & Preamplifier Chassis Assy.
16. High-Phase Sensing Board Assembly
17. Reactor, Regulator
18. Chassis
19. Terminal Board
Voltage Regulator (Part No. 430391C)
Figure 13
OM-2040 / Operation and Maintenance Manual
90D20 / Generator Sets
February 28/94 Chapter 1-1
Revised Page 21