Motor Thermal Protection - ABB ACS580 Firmware Manual

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.
Settings
• Menu - Primary settings - Start, stop, reference - Run permissions
• Parameters 21.04 Emergency stop mode
source (page 197),
ramp supervision
248).


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
After this, when power is applied to the drive, the motor is assumed to be at the
estimated temperature.
2. Motor temperature is calculated using the user-adjustable motor thermal time and
motor load curve. The load curve should be adjusted in case the ambient
temperature exceeds 30 °C.
Note: The motor thermal model can be used when only one motor is connected to
the inverter.
23.23 Emergency stop time
(page 247) and 31.33 Emergency ramp supervision delay
Program features 127
(page 197), 21.05 Emergency stop
(page 214), 31.32 Emergency
35.50 Motor ambient
(page
temperature).