![background image](http://html.mh-extra.com/html/thermo-king/crr-40-119/crr-40-119_manual_1104388014.webp)
Safety Precautions
14
Controller Repair
When servicing the controller, it is necessary to
ensure that electrostatic discharges are avoided.
Potential differences considerably lower than
those which produce a small spark from a finger
to a door knob can severely damage or destroy
solid-state integrated circuit components. The
following procedures must be rigidly adhered to
when servicing these units to avoid controller
damage or destruction.
1. Disconnect all power to the unit.
2. Avoid wearing clothing that generates static
electricity (wool, nylon, polyester. etc.).
3. Do wear a static discharge wrist strap (Refer
to Tool Catalog) with the lead end connected
to the microprocessor’s ground terminal.
These straps are available at most electronic
equipment distributors. Do not wear these
straps with power applied to the unit.
4. Avoid contacting the electronic components
on the circuit boards of the unit being
serviced.
5. Leave the circuit boards in their static proof
packing materials until ready for installation.
6. If a defective controller is to be returned for
repair, it should be returned in the same static
protective packing materials from which the
replacement component was removed.
7. After servicing the circuit board and any other
circuits, the wiring should be checked for
possible errors before restoring power.
Welding of Units or Containers
Whenever electric welding is to be performed on
any portion of the refrigeration unit, container or
container chassis with the refrigeration unit
attached, it is necessary to ensure that welding
currents are not allowed to flow through the
electronic circuits of the unit. These procedures
must be rigidly adhered to when servicing these
units to avoid damage or destruction.
1. Disconnect all power to the refrigeration unit.
2. Disconnect all quick-disconnect wire
harnesses from the back of the controller.
3. If the unit is equipped with a Remote Monitor
Module or Modem (RMM) or Integrated
Remote Monitor Unit (IRMU), disconnect all
wire harnesses from the RMM/IRMU circuit
board.
4. Switch all of the electrical circuit breakers in
the control box to the Off position.
5. Weld unit and/or container per normal
welding procedures. Keep ground return
electrode as close to the area to be welded as
practical. This will reduce the likelihood of
stray welding currents passing through any
electrical or electronic circuits.
6. When the welding operation is completed. the
unit power cables, wire harnesses and circuit
breakers must be restored to their normal
condition.
Summary of Contents for CRR-40 119
Page 4: ......
Page 16: ...Safety Precautions 16...
Page 18: ...Service Guide 18...
Page 20: ...Model Features 20...
Page 32: ...Specifications 32...
Page 120: ...MP 3000a Controller 120...
Page 160: ...Wiring and Schematic Diagrams Index 160...
Page 161: ...161 MPC2000 Wiring Schematic...
Page 162: ...162 MPC2000 High Voltage Wiring Diagram...
Page 163: ...163 MPC2000 Low Voltage Wiring Diagram...
Page 164: ...164 MPC2000 WCC Wiring Schematic...