EDGE 1545077 - Caterpillar

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(1) Electronic Control Module (ECM)
(2) J1 Harness Connector
(3) J2 Harness Connector
(4) "SSR 170 Lift" Relay
(5) "SSR 171 Lift" Relay
(6) "SSR 172 Drop" Relay
(7) "SSR 173 Drop" Relay
(8) Disconnect Switch
(9) “FU 101”
(10) “FU 102”
(11) “FU 108”
(12) “VBM” Voltage Band Monitor
(13) “SVR” Sample Voltage Relay
(14) “CT 2” Forward Current Transducer
(15) “CT 1” Reverse Current Transducer
(16) Negative Stud
(17) Magnet Fuse (Circuit)
(18) Circuit Board
(19) Positive Stud
(20) Boost Relay
(21) Controller HarnessThe ground fault indicator provides early detection of insulation breakdown. The indicator alerts the operator to the need for repair of the equipment before serious damage can occur. Early detection and repair of a ground fault can save both money and time. Early detection of problems is especially important for the generator and the magnet. Typically, the normal insulation resistance of cables, generators, and magnets is higher than one million ohms (>1 Megohm). Use a megohmmeter that is rated for 500 VDC to measure the resistance. Lower repair costs and longer equipment life can be realized by repairing the magnets and generators before the insulation resistance is down to 0.05 megohm.When in lift mode, this indicator will begin to illuminate when the insulation resistance to ground of the Positive Stud is starting to deteriorate. The indicator will glow brightly when the insulation resistance to ground has decreased to 0.05 megohm.Test Step 1. CHECK THE POSITIVE TERMINAL OF THE MAGNET FOR A SHORT TO GROUND.
Ensure that the machine is in the lift mode.
Press the "Drop" switch on the LH joystick before proceeding.
Before making any adjustments to the generator the engine must be shut off and the main disconnect switch on the controller must be in the off position. Personal injury can occur.Close all controller panel doors before the generator is started. Personal injury can occur.Never handle the leads to the magnet unless the generator is stopped and the main disconnect switch on the controller is in the off position. Personal injury can occur.
Switch the engine to the OFF position. Ensure that the generator is not rotating before proceeding.
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Control Panel door handle
Personal injury or death can result from high voltage.When power generation equipment must be in operation to make tests and/or adjustments, high voltage and current are present.Improper test equipment can fail and present a high voltage shock hazard to its user.Use electrical safety gloves when you are working in the cabinets.Make sure the testing equipment is designed for and correctly operated for high voltage and current tests being made.
Open the disconnect switch with the external handle on the enclosure door. Then, open the enclosure door with a screwdriver with your left hand. Hold the external handle in the release position with your right hand. (See Illustration 3.)
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(16) Negative Stud
(17) Magnet Fuse (Circuit)
(19) Positive Stud
Disconnect both cables to the magnet from the positive stud (19) and the negative stud (16) in the magnet control panel.
Disconnect both cables at the positive terminal and the negative terminal of the magnet.
At the magnet, connect the ground lead of the megohmmeter securely to the magnet frame.