(4) Overload module
Each output of the generator set has an overload module
(item 13 for No. 1 output, or item 14
for No. 2 output).
Each overload module is a solid-state device designed to interpret a signal
from a set of overload current transformers
(item 5 for No. 1 output, or item 5 for No. 2 output)
and to send a signal to the protective monitor module when an overload condition exists in
any generator output phase. A pull-apart electrical connector is mounted on the overload mod-
ule to provide quick-disconnect facilities for all wiring to a module. Each overload module is
equipped with a hermetically-sealed, reed-type relay. Relay contacts are normally open. The
solid-state circuitry is designed to close relay contacts when output current in ANY phase
reaches 125% of normal rated output capacity. The closed relay sends a signal to the protec-
tive monitor. This signal “gates” the overload SCR
(silicone-controlled rectifier)
in the protec-
tive monitor and interrupts the load contactor holding circuit, allowing the load contactor to
open.
The following is a list of overload module characteristics:
NOTE
: The overload protective system will function when any phase carries 123% to 127% of rated load.
•
At 125% load the module will function in 5 minutes.
•
At 150% load the module will function in 16 seconds.
•
At 200% load the module will function in 4 seconds.
NOTE
: All times are plus or minus 25% and are nonadjustable.
(5) Terminal boards
Two terminal boards
(7)
provide connection facilities for small leads.
OM-2029
1-1
September 30/89 Revised
Page 22
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Страница 122: ...Generator Set Figure 1 OM 2029 4 3 September 30 89 Revised Page 2 ...
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Страница 128: ...Canopy Assembly Figure 2 OM 2029 4 3 September 30 89 Revised Page 4 ...
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Страница 138: ...Electric Governor Kit Figure 6 OM 2029 4 3 September 30 89 Revised Page 14 ...
Страница 140: ...Panel Engine Control Assembly Figure 7 OM 2029 4 3 September 30 89 Revised Page 16 ...
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Страница 148: ...Power Module Panel Assembly Figure 10 OM 2029 4 3 September 30 89 Revised Page 24 ...
Страница 150: ...Generator Group Figure 11 OM 2029 4 3 September 30 89 Revised Page 26 ...
Страница 152: ...Fuel Line Assembly Figure 12 OM 2029 4 3 September 30 89 Revised Page 28 ...
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Страница 164: ...Solid State Voltage Regulator Assembly Part No 489812A Figure 15 4 3 July 27 90 Page 40 OM 2029 ...
Страница 166: ...Magnetic Amplifier Voltage Regulator Assembly Part No 281407 Figure 16 4 3 July 27 90 Page 42 OM 2029 ...
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