Attachment For External Heatsink; Noise Filter Installation; Installing A Motor Thermal Overload (Ol) Relay On The Drive Output - YASKAWA V1000 Technical Manual

Drive Model
4A0038
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Attachment for External Heatsink

An external attachment can be used to project the heatsink outside of an enclosure to ensure that there is sufficient air
circulation around the heatsink. This installation method still requires a certain amount of airflow over the drive case.
Refer to Output Current Derating Due to Ambient Temperature on page 327
sales representative for more information.
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Noise Filter Installation

This drive has undergone testing in conformance with IEC/EN 61800-5-1 and is in compliance with low voltage directives.
Refer to EMC Guidelines Compliance on page 436
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Installing a Motor Thermal Overload (oL) Relay on the Drive Output

Motor thermal overload relays protect the motor by disconnecting power lines to the motor due to a motor overload
condition.
Install a motor thermal overload relay between the drive and motor:
• When operating multiple motors on a single AC drive.
• When using a power line bypass to operate the motor directly from the power line.
It is not necessary to install a motor thermal overload relay when operating a single motor from a single AC drive. The
AC drive has UL recognized electronic motor overload protection built into the drive software.
Note: Disable the motor protection function (L1-0 1 = "0") when using an external motor thermal overload relay. The relay should shut off
main power on the input side of the main circuit when triggered.
n General Precautions when Using Thermal Overload Relays
The following application precautions should be considered when using motor thermal overload relays on the output of
AC drives in order to prevent nuisance trips or overheat of the motor at low speeds:
• Low speed motor operation
• Use of multiple motors on a single AC drive
• 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 to 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.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Class L Fuse Type Manufacturer: Fuji Electric
Model
CR6L-150/UL
for information on selecting a noise filter.
8.4 Installing Peripheral Devices
Fuse Ampere Rating
150
if derating is required. Contact a Yaskawa
8
313