Proper grounding is vitally important to safe and successful operation. Bring your ground
wire to the system subplate. You must choose the proper conductor size and minimize the
resistance to ground by using the shortest possible routing. See National Electrical Code
Article 250-95 or the applicable local electrical code.
Before applying power to the controller, physically check all the power resistors and other
components located in the resistor cabinet and inside the controller. Components loosened
during shipment may cause damage.
For proper operation of your controller, you must make sure that: 1) A direct solid ground is
provided in the machine room to properly ground the controller and motor. Indirect
grounds such as the building structure or a water pipe may not provide proper grounding
and could act as an antenna to radiate RFI noise, thus disturbing sensitive equipment in the
building. Improper grounding may also render any RFI filter ineffective. 2) The incoming
power to the controller and the outgoing power wires to the motor are in their respective,
separate, grounded conduits.
This equipment may contain voltages as high as 1000 volts. Use extreme caution. Do not
touch any components, resistors, circuit boards, power devices, or electrical connections
without ensuring that high voltage is not present.
Environmental Considerations
• Keep the machine room clean.
•Controllers are generally in NEMA 1 enclosures.
• Do not install the controller in a dusty area.
• Do not install the controller in a carpeted area.
• Keep room temperature between 32 and 104 degrees F (0 to 40 degrees C).
• Prevent condensation on the equipment.
• Do not install the controller in a hazardous location or where excessive amounts of
vapors or chemical fumes may be present.
• Make certain that power line fluctuations are within plus or minus 10% of proper value.
Air Conditioned Equipment Cabinets
If your control or group enclosure is equipped with an air conditioning unit, it is very important
to observe the following precautions. (Failure to do so can result in moisture damage to electri-
cal components.)
• Maintain the integrity of the cabinet by using sealed knockouts and sealing any holes
made during installation.
• Do not run the air conditioning while the cabinet doors are open.
• If you turn the air conditioner off while it is running, wait at least five minutes before
restarting it. Otherwise, the compressor may be damaged.
• Observe the recommended thermostat setting (75 degrees) and follow recommended
maintenance schedules.
• Make certain that the air conditioning drain tube remains clear to avoid water accumula-
tion in the unit.
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