MD600 Series Compact AC Drive Hardware Guide-EN-B06.PDF - 第33页
Electrical Design ‑ 32 ‑ Use the dedicated motor for the AC drive. Failure to comply will result in short circuit due to insulation. 4.3.5 Checking the Compatibility of the Motor and Drive The AC drive can be used to dri…
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4.3 Basic Electrical Safety Precautions
4.3.1 Selecting Power Supply Isolation Devices
Install a manually operated input isolation device between the AC power supply and the
AC drive. Disconnecting the isolation device can cut off the power supply for safety
during installation and maintenance.
EU
To comply with the EU guidelines, the isolation device must be one of the following types
according to electrical safety standards for machinery equipment specified in EN60204-1:
● Isolation switch (EN 60947-3) of AC-23B
● Circuit breaker for isolation which complies with EN 60947-2
Other regions
The isolation device must comply with the applicable safety regulations.
4.3.2 Selecting Main Contactors
If the main contactor is used, the type (number of operation times under load) must be
AC-1 and must be in accordance with IEC 60947-4. Select the contactor based on the
rated voltage and current of the AC drive.
4.3.3 Short-circuit protection
When the AC drive encounters an internal short circuit fault, the fuse used to protect the
AC drive will prevent damage to the AC drive and the adjacent devices.
If the motor cable size is determined according to the rated current of the AC drive, the AC
drive can protect the motor cable and motor in case of short circuit. No other protective
equipment is required.
4.3.4 Selecting Motors
After power-on, the motor generates heat continuously due to thermal effect of the
current. The heat is then dissipated to the surroundings. When the generated heat
exceeds the dissipated heat, the motor temperature rises, which will burn the motor.
The drive provides motor overload protection, but does not provide motor overheat
protection. Therefore, use a motor with the overheat detection function.
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Use the dedicated motor for the AC drive. Failure to comply will result in short circuit due
to insulation.
4.3.5 Checking the Compatibility of the Motor and Drive
The AC drive can be used to drive one or multiple AC asynchronous induction motors
simultaneously. According to AC voltage and motor load, select the motor capacity and
drive model according to
"11.3 Electrical Specifications
"
on page 94
.
4.3.6 Selecting SPD Surge Protection Devices
The surge protection device (SPD) is installed on the input side of the AC drive to ensure
that electrical systems and important electrical and electronic equipment are protected
from damage caused by lightning overvoltage. The SPD is mainly used to limit transient
overvoltage and operating overvoltage caused by lightning in power supply and signal
systems. Lightning surges can be transmitted to the AC drive through the power supply or
signal cable. When a lightning stroke occurs, the ground potential increases, which may
damage the drive. The induced voltage can be produced in the cable and loop when a
pulse electromagnetic field is generated by a lightning strike on the building (or in the
vicinity). Therefore, in addition to the external lightning protection measures such as the
installation of lightning rods, down conductors, and grounding devices, you need to
install an SPD. This is because the lightning rod, down conductor, and grounding device
cannot prevent conduction of lightning induction surge along the cable and secondary
lightning strike.
4.3.7 Requirements on Power Grid System Compatibility
When the power supply distribution system of the AC drive is an asymmetric grounding
system or a floating ground system (IT system), remove the ground safety capacitor for
grounding applications. Any voltage to ground of the asymmetric grounding system or
floating ground system (IT system) may exceed the voltage of the built-in filter and safety
capacitor. Therefore, connecting to ground in this system will damage the AC drive.
To avoid risks or accidents, it is not recommended to use the AC drive in an asymmetric
grounding system or in a floating ground system (IT system).
The AC drive supports only TN and TT star-type power grids under normal conditions.
Other power grids are not supported. Contact Inovance technical service personnel if
necessary.
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4.4 Electromagnetic Compatibility
Overview
Electromagnetic compatibility (EMC) means that a device or system can work normally in
its electromagnetic environment and the device or system does not emit electromagnetic
interference (EMI) that causes abnormal operation of other devices or systems in the
environment.
Category
Electromagnetic compatibility performance of the drive includes two aspects:
electromagnetic emission (EMI) and electromagnetic sensitivity (EMS). EMI includes
radiated emission (RE) and conducted emission (CE).
● Radiated emission (RE): interference signal radiated by the product through the port
on its housing.
● Conducted emission (CE): interference signal conducted from the product through its
cable port.
Interference and Anti-interference
Electromagnetic compatibility is a system-level concept, which indicates that the product
has certain anti-interference capabilities and does not seriously interfere with other
devices.
4.5 Cabinet Design
4.5.1 Recommended Cabinet Layout
Reserve sufficient clearance according to the power rating of the drive. The
recommended installation methods of the MD600 include single-layer installation
and multi-layer installation.
● When only a single device is installed, reserve sufficient clearance around the device,
as shown in the following figure.