Motor Overload Protection - ABB ACS560 Firmware Manual

88 Program features
Connection of motor temperature sensor to the drive via a relay
PTC alternative A: This table shows the insulation requirement for a customer's
external relay, and the insulation requirement for the sensor to fulfill decisive voltage
class A (double insulation) of IEC 60800-5-1.
PTC relay
Type
External relay
PTC alternative B: Decisive voltage class B of IEC 60800-5-1 (basic insulation) is
provided with a 6 kV relay. Circuits connected to all motor protection relay inputs and
outputs must be protected against direct contact.
Pt100 alternative A: This table shows the insulation requirement for a customer's
external relay, and the insulation requirement for the sensor to fulfill decisive voltage
class A (double insulation) of IEC 60800-5-1.
Pt100 relay
Type
External relay
Pt100 alternative B: Decisive voltage class B of IEC 60800-5-1 (basic insulation) can
be achieved when there is basic insulation between the sensor and live parts of the
motor. Circuits connected to all motor protection relay inputs and outputs must be
protected against direct contact.
Settings and diagnostics
Menu - Primary settings - Motor - Thermal protection estimated,
Menu - Primary settings - Motor - Thermal protection measured
Settings
Parameter group 35 Motor thermal protection


Motor overload protection

This section describes motor overload protection without using motor thermal
protection model, either with estimated or measured temperature. For protection with
the motor thermal protection model, see section
Motor overload protection is required and specified by multiple standards including
the US National Electric Code (NEC), UL 508C and the common UL\IEC 61800-5-1
standard in conjunction with IEC 60947-4-1. The standards allow for motor overload
protection without external temperature sensors.
The protection feature allows the user to specify the class of operation in the same
manner as the overload relays are specified in standards IEC 60947-4-1 and NEMA
ICS 2.
Insulation
Basic insulation 6 kV
Insulation
Basic insulation 6 kV
Temperature sensor insulation requirement
Basic insulation
Temperature sensor insulation requirement
between sensor and live parts of motor
Basic insulation
(page 280).
Motor thermal protection on page 82.