Standard programposi features 83
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
Parameters 06.17 Drive status word 2 (page 118), 06.18 Start inhibit status word
(page 119), 21.04 Emergency stop mode (page 191), 21.05 Emergency stop source
(page 191), 23.23 Emergency stop time (page 207), 25.13 Min torq sp ctrl em stop
(page 219), 25.14 Max torq sp ctrl em stop (page 219), 25.15 Proportional gain em
stop (page 219), 31.32 Emergency ramp supervision (page 248) and 31.33
Emergency ramp supervision delay (page 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.
In addition to temperature monitoring, a protection function is available for ‘Ex’ motors
installed in a potentially explosive atmosphere.
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 35.50 Motor ambient temperature).
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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