(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. 8)
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 hermeticallysealed, reed-type relay. Relay contacts are normally open.
The solidstate 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 protective
monitor. This signal “gates” the overload SCR
(silicone-controlled rectifier)
in the protective moni-
tor 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 4 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.
(4) Rectifier
A diode-bridge rectifier
(5)
receives 400-Hz AC from phase C of the generator output an converts
it to a pulsating, direct current for energization of the load contactor holding coil only. This DC coil-
holding circuit is controlled indirectly be controlling the 400-Hz AC to the rectifier. The ground cir-
cuit 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 protec-
tive monitor relay, the rectifier’s AC circuit is opened. No DC is then available for the load contac-
tor holding coil, hence, the load contactor opens.
(5) Terminal boards
Three terminal boards
(2)
provide connection facilities for small leads.
OM-2028
1-1
May 1/91 Revised
Page 22
Содержание 6910
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Страница 14: ...This page intentionally left blank OM 2028 Introduction June 20 89 Revised Page 2 ...
Страница 40: ...This page intentionally left blank OM 2028 1 1 May 1 91 Revised Page 26 ...
Страница 66: ...Engine Control Panel in Tilt out Position Figure 6 OM 2028 2 1 August 31 90 Revised Page 12 ...
Страница 72: ...This page intentionally left blank OM 2028 2 2 June 20 89 Revised Page 6 ...
Страница 100: ...Test Receptacle Connector Termi nals Identification Figure 4 OM 2028 3 1 June 20 89 Revised Page 8 ...
Страница 128: ...Generator Set Figure 1 OM 2028 4 3 May 1 91 Revised Page 2 ...
Страница 130: ...Canopy Assembly Figure 2 OM 2028 4 3 May 1 91 Revised Page 4 ...
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Страница 134: ...Generator Set Without Canopy Figure 3 OM 2028 4 3 May 1 91 Revised Page 8 ...
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Страница 138: ...Radiator and Cooling System Group Figure 4 OM 2028 4 3 May 1 91 Revised Page 12 ...
Страница 140: ...Air Cleaner Assembly For units manufactured before and during August 1990 Figure 5 OM 2028 4 3 May 1 91 Revised Page 14 ...
Страница 142: ...Electric Governor Kit Figure 6 OM 2028 4 3 May 1 91 Revised Page 16 ...
Страница 144: ...Fuel Lines Assembly Figure 7 OM 2028 4 3 May 1 91 Revised Page 18 ...
Страница 146: ...Oil Line Assembly Figure 8 OM 2028 4 3 May 1 91 Revised Page 20 ...
Страница 148: ...Stator Terminal Panel Assembly Figure 9 OM 2028 4 3 May 1 91 Revised Page 22 ...
Страница 150: ...Power Module Panel Assembly Figure 10 OM 2028 4 3 May 1 91 Revised Page 24 ...
Страница 152: ...Control Box Assembly Figure 11 OM 2028 4 3 May 1 91 Revised Page 26 ...
Страница 154: ...Generator Controls Tray Assembly Figure 12 OM 2028 4 3 May 1 91 Revised Page 28 ...
Страница 156: ...Protective Relays Tray Assembly Figure 13 OM 2028 4 3 May 1 91 Revised Page 30 ...
Страница 158: ...Control Box and Internal Components Group Figure 14 OM 2028 4 3 May 1 91 Revised Page 32 ...
Страница 160: ...Engine Control Panel Assembly Figure 15 OM 2028 4 3 May 1 91 Revised Page 34 ...
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Страница 164: ...Output Terminal Board Assembly Figure 16 OM 2028 4 3 May 1 91 Revised Page 38 ...
Страница 166: ...Generator Assembly Figure 17 OM 2028 4 3 May 1 91 Revised Page 40 ...
Страница 168: ...Mounting Frame Assembly and Lifting Yoke Figure 18 OM 2028 4 3 May 1 91 Revised Page 42 ...
Страница 170: ...Water Heater Figure 19 OM 2028 4 3 May 1 91 Revised Page 44 ...
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