8. Test Box
The test box is an optional accessory item used for testing the generator set. All generator sets are wired
to accommodate a test box, however, the box is supplied only when ordered
(Part Number 388318A-1).
A. Description (See Fig. 11)
The test box assembly consists of a rotary selector switch, momentary contact pushbutton switch,
and two, insulated-tip test jacks, mounted in a small metal box. Connection to the generator set is
made through a wiring harness equipped with a 26-contact plug connector which mates with a recep-
tacle connector.
B. Theory of Operation
Wire leads are connected to the electrical circuitry of the generator set at various points and routed to
a receptacle connector, mounted on the engine control panel. They are connected to the test box ro-
tary switch by a plug connector and wiring harness.
The rotary selector switch is wired in such a manner that for any switch position, two pre-selected test
points in the generator set circuitry are connected for testing. The selector switch may be rotated to
any one of 22 positions, however not all positions are used in this installation. An instruction plate
mounted under the switch knob indicates switch positions and component tested in each position.
Normal voltage for each test is also indicated.
Two test jacks are provided for connection of the test prods of a voltmeter. After the voltmeter is con-
nected and selector switch positioned, the test circuit is closed by pressing the pushbutton switch. A
voltage value may then be observed on the voltmeter. This arrangement prevents energization of test
circuitry and equipment for extended periods and allows the operator to reset and adjust the voltmeter
without disconnecting it from the box. For operating instructions, see Sect. 1-3, Para. 3.
1. Test box
2. Cable
3. Plug connector
Test Box Assembly
(Optional)
Figure 11
OM-2028
1-1
May 1/91 Revised
Page 24
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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