Motor Thermal Protection - ABB ACS560 Firmware Manual

82 Program features
The mode of the emergency stop is selected by parameter
mode. The following modes are available:
• Off1: Stop along the standard deceleration ramp defined for the particular
reference type in use
• Off2: Stop by coasting
• Off3: Stop by the emergency stop ramp defined by parameter
stop time.
Notes:
• The installer of the equipment is responsible for installing the emergency stop
devices and all additional devices needed for the emergency stop function to fulfill
the required emergency stop categories. For more information, contact your local
ABB representative.
• After an emergency stop signal is detected, the emergency stop function cannot
be canceled even though the signal is canceled.
• If the minimum (or maximum) torque limit is set to 0%, the emergency stop
function may not be able to stop the drive.
• During an emergency stop, the speed and torque reference parameters such as
reference ramp shapes
considered.
Settings
Parameters 21.04 Emergency stop mode
(page 211), and 23.23 Emergency stop time


Motor thermal protection

The control program features two separate motor temperature monitoring functions.
The temperature data sources and warning/trip limits can be set up independently for
each function.
The motor temperature can be monitored using
• the motor thermal protection model (estimated temperature derived internally
inside the drive), or
• sensors installed in the windings. This will result in a more accurate motor model.
Motor thermal protection model
The drive calculates the temperature of the motor on the basis of the following
assumptions:
1. When power is applied to the drive for the first time, the motor is assumed to be at
ambient temperature (defined by parameter
(23.32 Shape time 1
(page 211),
(page 228).
21.04 Emergency stop
23.23 Emergency
and 23.33 Shape time
21.05 Emergency stop source
35.50 Motor ambient
2) are not
temperature).