Equipment For Troubleshooting; Safety - Warning; Parts Replacement; Test Values - Hobart 60PL20 Operation And Maintenance Manual

OM-2053

3. Equipment for Troubleshooting

A good quality multi-scale voltohmmeter is the only instrument required for trouble shooting. At least two
"jumper" leads with "alligator" clips and test prods will be required. The 12-V, engine electrical system may
be used as a 12-V DC power source.

4. Safety - WARNING:

WARNING: Exercise extreme care to avoid contact with high voltage leads and
components which could cause serious shock and injury if touched when
trouble shooting or operating the equipment.

5. Parts Replacement

To lessen end item "down" time and to get a faulty machine back "on-theline" as quickly as possible, the
"black-box" concept of parts replacement is reflected in the trouble shooting chart. For example, if a com-
ponent in a particular assembly or module is defective, the quickest way to remedy the situation is to re-
place the complete assembly or the module and send the old assembly or module to stock. Assemblies
which lend themselves to this concept are:
Voltage regulator
Governor actuator
Overload module
Over-undervoltage module
The above items are in addition to normally replaced items such as fuel pump, injectors, relays, etc.

6. Test Values

Although test values are provided throughout the trouble shooting chart, where applicable, additional infor-
mation and values are given as follows.
Generator output at maximum voltage regulator rheostat setting
Generator output at minimum voltage regulator rheostat setting
Depending on customer requirements, two over-undervoltage PC boards and four over-under fre-
quency PC boards are available. Trip values, trip times and reset values for these PC boards are
shown in the table on the following page.
3-1
Page 2
Protective monitor module
Over-underfrequency module
Electric governor control "box"
134 V or higher
108 V or lower
December 30/93 Revised