Nema Type 1 Kit - YASKAWA CIMR-JC4A0002BAA Quick Start Manual

7.4 Installing Peripheral Devices
• Motor cable length
• Nuisance tripping resulting from high AC drive carrier frequency
Low Speed Operation and Motor Thermal oL Relays
Generally, thermal relays are applied on general-purpose motors. When general-purpose
motors are driven by AC drives, the motor current is approximately 5 ~ 10% greater than if
driven by the commercial power supply. In addition, the cooling capacity of a motor with a
shaft-driven fan decreases when operating at low speeds. Even if the load current is within
the motor rated value, motor overheating may occur. A thermal relay cannot effectively protect
the motor due to the reduction of cooling at low speeds. For this reason, apply the UL
recognized electronic thermal overload protection function built into the drive whenever
possible.
UL recognized electronic thermal overload function of the drive: Speed-dependent heat
characteristics are simulated using data from standard motors and force-ventilated motors.
The motor is protected from overload using this function.
Using One Drive with Multiple Motors
Turn off the electronic thermal overload function. Please refer to the appropriate product
instruction manual to determine which parameter disables this function.
The UL recognized electronic thermal overload function of the drive cannot be applied when
using multiple motors on one drive.
Long Motor Cables
When long motor cables and high carrier frequency are used, nuisance tripping of the thermal
relay may occur due to increased leakage current. Therefore, reduce the carrier frequency or
increase the tripping level of the thermal overload relay.
Nuisance Tripping Resulting from High AC Drive Carrier Frequency
Current waveforms generated by high carrier frequency PWM drives tend to create additional
temperature rise in overload relays. Therefore, it may be necessary to increase the trip level
setting when encountering nuisance triggering of the relay.
WARNING! Fire Hazard. Confirm an actual motor overload condition is not present prior to increasing the
thermal oL trip setting. Check local electrical codes before making adjustments to motor thermal overload
settings.
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NEMA Type 1 Kit

WARNING! Fire Hazard. Provide sufficient cooling when installing the drive inside an enclosed panel or
cabinet. Failure to comply could result in overheating and fire. When multiple drives are placed inside the
same enclosure panel, install proper cooling to ensure air entering the enclosure does not exceed 40 °C.
The optional NEMA Type 1 kit can be installed to raise the enclosure protection level of an
IP20/Open-Chassis drive to NEMA Type 1. Drives with a NEMA Type 1 kit cannot be
installed using side-by-side mounting unless the top cover is removed. The drive does not
retain NEMA Type 1 integrity with the top cover removed. Refer to Installation Orientation
and Spacing on page 30 for installation instructions.
190 YASKAWA ELECTRIC TOEP C710606 26B YASKAWA AC Drive – J1000 Quick Start Guide
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