ABB ACQ580-34, Hardware Manual

Page: 88 / 244

Protecting the input power cable against thermal overload
The drive has overload protection as standard. If the sizing of the input power cable is
correct, the drive overload protection protects also the cable against overload. In case of
parallel input power cables, it may be necessary to protect each cable separately. Obey the
local regulations.
Implementing a motor temperature sensor connection
WARNING!
IEC 61800-5-1 requires double or reinforced insulation between live parts and
accessible parts when:
• the accessible parts are not conductive, or
• the accessible parts are conductive, but not connected to the protective earth.
Obey this requirement when you plan the connection of the motor temperature
sensor to the drive.
You have these implementation alternatives:
1. If there is double or reinforced insulation between the sensor and the live parts of the
motor: You can connect the sensor directly to the analog/digital input(s) of the drive.
See the control cable connection instructions. Make sure that the voltage does not
exceed the maximum allowed voltage over the sensor.
2. If there is basic insulation between the sensor and the live parts of the motor: You can
connect the sensor to the analog/digital input(s) of the drive. All other circuits connected
to the digital and analog inputs (typically extra-low voltage circuits) must be:
• protected against contact, and
• insulated with basic insulation from other low-voltage circuits. The insulation must be
rated for the same voltage level as the drive main circuit.
Note: Extra-low voltage circuits (for example, 24 V DC) typically do not meet these
requirements.
Make sure that the voltage does not exceed the maximum allowed voltage over the
sensor.
As an alternative, you can connect the sensor with basic insulation to the analog/digital
input(s) of the drive, if you do not connect any other external control circuits to the drive
digital and analog inputs.
3. You can connect the sensor to the drive via an option module. The sensor and the
module must form a double or reinforced insulation between the motor live parts and
the drive control unit. See
Connecting motor temperature sensor to the drive via an
option module (page 88) . Make sure that the voltage does not exceed the maximum
allowed voltage over the sensor.
4. You can connect a sensor to a digital input of the drive via an external relay. The sensor
and the relay must form a double or reinforced insulation between the motor live parts
and the digital input of the drive. Make sure that the voltage does not exceed the
maximum allowed voltage over the sensor.
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Connecting motor temperature sensor to the drive via an option module
This table shows:
88 Guidelines for planning the electrical installation