Safety And Protections; Emergency Stop; Motor Thermal Protection - ABB ACS880 Firmware Manual

Safety and protections



Emergency stop

The emergency stop signal is connected to the input selected by parameter
Emergency stop source. The mode of the emergency stop is selected by parameter
21.04 Emergency stop
fieldbus (parameter
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.


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), 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 at ambient
temperature (defined by parameter
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.
mode. An emergency stop can also be generated through a
06.01 Main control word, bits 0...2).
35.50 Motor ambient
Program features 49
21.05
temperature). After this,