Motor Thermal Protection - ABB ACS380 Firmware Manual

ACS380 FW.book Page 98 Friday, May 4, 2018 4:18 PM
98 Program features
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.
• 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 171), 23.23 Emergency stop time
supervision (page 230) and


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.
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(23.32 Shape time 1 and 23.33 Shape time
(page 170), 21.05 Emergency stop source
(page 192), 31.32 Emergency ramp
31.33 Emergency ramp supervision delay
35.50 Motor ambient
2) are not
(page 231).
temperature).