CSD Series
Variable Frequency AC Drive
MOTORTRONICS
- 10 -
3.2 Grounding
Always be sure to make a positive ground connection to the Earth
terminal of the drive. This is necessary for both protection of personnel
and for reliable, trouble free operation. Following are additional
guidelines for proper grounding:
• See Table 3 A for minimum ground wire size.
• Resistance to ground should be 100 ohms or less.
• Never ground the drive with welding or other high current machines.
• When several units are used together they should all be grounded to
a common pole. Alternatively, connecting all of the Earth (E) terminals
together and running a single wire to the ground pole is acceptable.
Be sure you do not form a ground loop with the ground wires.
• Wire must be class 1 wire with a voltage rating minimum of 300V for
230 VAC systems and 600V for 460 VAC systems.
• Control wiring should not be run in the same conduit or raceway with
power or motor wiring.
3.3 Power Connection Diagram
Figure 3 - 1
Power Wiring Diagram
Motor Overload Protection
Motors should have external thermal overload protection. Due to the
characteristics of variable frequency drive applications, the best thermal
protection for the motor is using a thermostat imbedded in the stator
of the motor and interlocking this contact in the drive’s control logic.
Optional braking module
(Units 15HP and above)
Optional Braking Resistor
(Units 10 HP & below)
Note: In single phase input
applications, connect the
AC power source to L1
and L2.
External DC Choke
(Optional on units 15-30HP
Standard on units above 30 HP)
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