Sevcon Troubleshooting
Page 5
Electrical Troubleshooting
Test 1. CHECKING THE CONTROL LOGIC
INPUTS
Close the seat switch. Place the high/low switch in
the HIGH position.
Connect a voltmeter across the ISO solenoid coil
terminals and carefully monitor the voltage as the
key switch is turned on.
Turn the key switch ON and wait 1-second until
the Isolator contactor closes.
Perform the following tests:
TEST 1.1
The coil voltage should start at approximately 24
volts when the key is turned ON, then drop to
approximately 15 volts after about 0.5 seconds.
If the test is good, then skip ahead to test #
1.2.
If the voltage starts high, drops to 15 volts,
and then drops to 0 volts, then it indicates
an open circuit to the main battery positive.
Check the continuity of the ISO solenoid
contacts, the main circuit breaker, and the
wiring to the main battery positive post.
If the voltage is starts at 24 volts but the
solenoid does not pick up, then skip ahead
toTest #5.
If the voltage does not start at 24 volts, then
go to Test #4.
TEST 1.2:
Test the voltage from B+ to B- on the Controller.
If the voltage equals battery volts, then go
to Test #1.3.
If the voltage does not equal battery volts,
then:
•
Check the main positive wire to the circuit
breaker for open circuits.
•
Check the wire from the circuit breaker to
battery positive.
•
Check the wire from the contactor to B+ on
the controller for open circuits.
•
Check the wire from B- to battery negative
on the controller for open circuits.
Stop trouble shooting here and repair the
problem. When the repair is completed,
completely retest the vehicle before lowering
the drive wheels to the ground.
TEST 1.3:
Test the voltage at pin #6 on the 12-pin logic card
connector.
If the voltage is low, then skip ahead to Test
#1.4.
If the voltage is high, then check the wire to
the High/Low switch and the High/Low
switch for open circuits.
NOTE: The High/Low switch is optional and the
vehicle may not have this option. If the
vehicle is not equipped with option then there
is a jumper bypass installed in place of the
switch in the dash. Check the jumper to be
sure it is still connected.
Stop trouble shooting here and repair the
problem. When the repair is completed,
completely retest the vehicle before lowering
the drive wheels to the ground.
STOP
TEST 1.4:
Test the voltage at pin #5 on the 12-pin logic card
connector.
If the voltage is low, then skip ahead to Test
#1.5.
If the voltage is high, then:
•
Check the seat switch for open contacts.
•
Check that the seat switch is engaging the
seat correctly.
•
Check the wire from the pin 5 to the seat
switch for open circuits.
•
Check the wire from the seat switch to B-
for open circuits.
If all of the above is in working order, then the
logic card may have failed.
Stop trouble shooting here and repair the
problem. When the repair is completed,
completely retest the vehicle before lowering
the drive wheels to the ground.
Stop, do not continue. Reaching this point
indicates a failure in the Sevcon power unit
or an error was made during testing. Confirm
all previous tests were performed correctly
before replacing the Sevcon power unit.
STOP
Содержание B0-T48-48 Taylor Truck T48
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Страница 12: ...Model B 1 00...
Страница 58: ...Maintenance Service and Repair Steering Page 14 Exploded View of Steering Gear...
Страница 73: ...TABLE OF CONTENTS Throttle Linkage Adjustments 2 Magnetic Module 2 Pot Box module 3 Throttle Linkage...
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Страница 119: ...Sevcon Troubleshooting Page 3 Electrical Troubleshooting Identifying Your Controller...
Страница 138: ...Sevcon Troubleshooting Page 22 Electrical Troubleshooting...
Страница 158: ...Battery Charger Page 20 MN 402 000...
Страница 161: ...Wire Diagrams Wire Diagrams Page 3...
Страница 166: ...Illustrated Parts Parts Page 4 Front Brakes...
Страница 168: ...Illustrated Parts Parts Page 6 Steering Linkage...
Страница 170: ...Illustrated Parts Parts Page 8 Steering Column 1 2 3 4 5 6 7 9 8 12 10 11 13 14...
Страница 172: ...Illustrated Parts Parts Page 10 Steering Gear 9 15 16 10 2 3 14 17 12 11 13 6 8 7 5 1 4...
Страница 174: ...Illustrated Parts Parts Page 12 Front Suspension...
Страница 176: ...Illustrated Parts Parts Page 14 Transmission Gear Case...
Страница 178: ...Illustrated Parts Parts Page 16 Transmission Differential Case...
Страница 182: ...Illustrated Parts Parts Page 20 Rear Brakes Brake Body...
Страница 186: ...Illustrated Parts Parts Page 24 Motor...
Страница 188: ...Illustrated Parts Parts Page 26 Electric Brake 1 2 3 4 5 7 8 9 10 6 11 Automatic Electric Brake Component View...
Страница 190: ...Illustrated Parts Parts Page 28 Master Cylinder 2 3 4 1 5 6 7 8...
Страница 192: ...Illustrated Parts Parts Page 30 Brake Lines...
Страница 194: ...Illustrated Parts Parts Page 32 Brake Linkage parking brake...
Страница 196: ...Illustrated Parts Parts Page 34 Wheels and Tires Ref wheel hub 1 2 3...
Страница 200: ...Illustrated Parts Parts Page 38 Speed Control Panel...
Страница 202: ...Illustrated Parts Parts Page 40 Miscellaneous Frame and Body...
Страница 210: ...Illustrated Parts Parts Page 48 Decals 1 2 4 3 5 6 7...
Страница 212: ...Illustrated Parts Parts Page 50 Strobe Light...
Страница 214: ...Illustrated Parts Parts Page 52 Steel Cab T48 Page 1...
Страница 216: ...Illustrated Parts Parts Page 54 Steel Cab T48 Page 2...
Страница 218: ...Illustrated Parts Parts Page 56 Tops T48...
Страница 220: ...Illustrated Parts Parts Page 58 Doors T48...
Страница 222: ...Illustrated Parts Parts Page 60 Optional Deckboards T48...
Страница 224: ...Illustrated Parts Parts Page 62 Cargo Box...
Страница 226: ...Illustrated Parts Parts Page 64 Stake Sides...
Страница 228: ...Illustrated Parts Parts Page 66 1 2 7 8 3 4 5 5a 9 11 12 13 14 16 10 6 18 17 15 Cab Deck ET 3000...
Страница 230: ...Illustrated Parts Parts Page 68 3 4 5 6 1 2 Door Latch 9 8 7 Cab Components ET 3000...
Страница 234: ...TAYLOR DUNN...