5. Objetivos particulares.
12.8 Activación del canal Nav1.4.
2. If frequency is now good but voltage is high or low, go to Problem 1, Test 4.
teSt 14 – check VoltaGe and
FreqUency Under load
DISCUSSION:
It is possible for the generator AC output frequency and voltage to be good at no-load, but they may drop excessively when electrical loads are applied. This condition, in which voltage and frequency drop exces- sively when loads are applied, can be caused by (a) overloading the generator, (b) loss of engine power, or (c) a shorted condition in the stator windings or in one or more connected loads.
PROCEDURE:
1. Connect an accurate AC frequency meter and an AC voltmeter across the stator AC power winding leads. 2. Start the engine, let it stabilize and warm-up.
3. Apply electrical loads to the generator equal to the rated capacity of the unit.
4. Check the AC frequency and voltage.
a. Single Cylinder Units: Frequency should not drop below approximately 58 Hertz. Voltage should not drop below about 230 volts.
b. V-Twin Engine Units: Frequency should not drop below approximately 60 Hertz. Voltage should not drop below about 240 volts.
RESULTS:
1. If frequency and voltage drop excessively under load, go to Test 15.
2. If frequency and voltage under load are good, discon- tinue tests.
teSt 15 – check For oVerload condItIon
DISCUSSION:
An “overload” condition is one in which the generator rated wattage/amperage capacity has been exceed- ed. To test for an overload condition on an installed unit, the best method is to use an ammeter. See “Measuring Current” in Section 1.4.
PROCEDURE:
Use a clamp-on ammeter to measure load current draw, with the generator running and all normal electrical loads turned on. RESULTS:
1. If the unit is overloaded, reduce loads to the unit’s rated capacity.
2. If unit is not overloaded, but rpm and frequency drop excessively when loads are applied, go to Test 16.
teSt 16 – check enGIne condItIon
DISCUSSION:
If engine speed and frequency drop excessively under load, the engine may be under-powered. An under- powered engine can be the result of a dirty air clean- er, loss of engine compression, faulty fuel settings, incorrect ignition timing, etc.
PROCEDURE:
For engine testing, troubleshooting and repair pro- cedures refer to Problem 11 in Section 4.3. For fur- ther engine repair information refer to the appropri- ate engine service manuals.
AC GENERATORS
Part 3
“W/V-tYPE”
traNsfEr
sWitcHEs
air-cooled, automatic
standby Generators
3.1 Description and Components ... 50 General ...50 Enclosure ...50 Transfer Mechanism ...51 Transfer Relay ...51 Neutral Lug ...52 Manual Transfer Handle ...52 Terminal Block ...52 Fuse Holder ...53 3.2 Operational Analysis ... 54 Utility Source Voltage Available ...56 Utility Source Voltage Failure ...57 Transfer To Standby ...58 Transfer To Standby ...59 Utility Restored...60 Utility Restored, Transfer SwitchDe-energized ...61 Utility Restored,
Retransfer Back To Utility ...62 Transfer Switch In Utility ...63 3.3 Troubleshooting Flow Charts ... 64 Introduction To Troubleshooting ...64 Problem 5 – In Automatic Mode,
No Transfer to Standby ...64 Problem 6 – In Automatic Mode, Generator
Starts When Loss of Utility Occurs, Generator Shuts Down When Utility Returns But There Is
No Retransfer To Utility Power ...65 Problem 7 – Blown F1 or F2 Fuse ...65
3.4 Diagnostic Tests ... 66 General ...66 Test 21 – Check Voltage at
Terminal Lugs E1, E2 ...66 Test 22 – Check Voltage at
Standby Closing Coil C2 ...67 Test 23 – Test Transfer Relay TR ...67 Test 24 – Check Manual Transfer
Switch Operation ...68 Test 25 – Test Limit Switch XB1 ...69 Test 26 – Check 23 And 194
Wiring/Connections ...69 Test 27- Check Voltage At
Terminal Lugs N1, N2 ...70 Test 28 – Check Voltage At Utility 1
And Utility 2 Terminals ...70 Test 29 – Check Voltage At
Utility Closing Coil C1 ...71 Test 30 – Check Fuses F1 And F2 ...71 Test 31 – Test Limit Switch Xa1 ...72 Test 32 – Continuity Test Of Wiring (C1) ...72 Test 33 – Continuity Test Of Wiring (C2) ...72 Test 34 – Check N1 And N2 Wiring...73 Test 35 – Check Transformer (Tx) ...73
Part titLE PG#
3.1. Description and components 50
3.2 operational analysis 54
3.3 troubleshooting flow charts 64
General
The “W/V-Type” transfer switch is rated 100 amps at 250 volts maximum. It is available in 2-pole configura- tion only and, for that reason, is usable with 1-phase systems only.
Transfer switches do not have an intelligence sys- tem of their own. Instead, automatic operation of these transfer switches is controlled by a circuit board housed in the generator control panel.
encloSUre
The “W/V-Type” transfer switch enclosure is a NEMA 1 type (“NEMA” stands for “National Electrical Manufacturer’s Association”). Based on NEMA Standard 250, the NEMA 1 enclosure may be defined as one that is intended for indoor use primarily to provide a degree of protection against contact with the enclosed equipment and where unusual service conditions do not exist.
30 1 29 27 9 21 23 31 7 17 18 11 5 3 2 39 40 36 19 25 15 26 38 41 33 32 34 34 35 42 3 12 14 8 13 3B 3A itEm DEscriPtioN
1 BOX GTS LOAD CENTER
2 COVER, 12 POSITION GTS LOAD CENTER
3 TRANSFER SWITCH HOME STANDBY 100A2P250V
4 SCREW TAPTITE M5-0.8 X 10 BP
5 SCREW TAPTITE 1/4-20 X 5/8 BP
6 LOCK WASHER, SPECIAL-1/4”
7 RELAY PANEL 12VDC DPDT 10A@240VA
8 BASE, MOUNTING 12 CIRCUIT 125A/240V
9 SCREW TAPTITE M4-0.7X10 BP
10 RIVET POP .156 X .160-.164/#20
11 WASHER FLAT 1/4 ZINC
12 PLUG
13 HARNESS ADAPTER PLATE
14 PANEL-SUB BREAKER BASE
15 TRIM VINYL BLACK 1/8GP
16 WASHER LOCK #10
17 NUT WING M6-1.0
18 HANDLE, TRANSFER SWITCH HOME STANDBY
19 HOLDER CABLE TIE
21 LUG DIS QK NI-S 10X45 DEG BR/T
22 SCREW PPHM #10-32 X 1/4
23 LUG SLDLSS 1/0-#14X9/16 AL/CU
24 BLOCK TERMINAL 20A 5 X 6 X 1100V
25 TIE WRAP 3.9” X .10” NAT’L UL
26 WASHER FLAT #8 ZINC
27 COVER, RELAY & TERM BLOCK
28 WIRE HARNESS,GTS LOAD CENTER (NOT SHOWN FOR CLARITY)
29 FUSE HOLDER
30 ASSEMBLY FUSE 5A X BUSS HLDR73591
31 PCB SUPPORT SNAP-IN 1-3/8”
32 CIRCT BRK 20 X 1 HOM120
33 CIRCT BRK 20 X 2 HOM220
34 CIRCT BRK 15 X 1 HOM115
35 CIRCT BRK 30 X 2 HOM230
36 COVER - HARNESS ENTRY
37 HARNESS, GTS TO EXT CONN BOX
38 WASHER LOCK M4
39 SCREW SW 1/4-20X5/8 N WA JS500
40 SCREW SWAGE 1/4-20 X 1/2 ZINC
41 SCREW PPHM M4-0.7 X 10
42 HARNESS,GTS TO MAIN PANEL
Figure 1. Exploded View of W/V-Type Transfer Switch