Motor Thermal Protection - ABB ACS180 Firmware Manual

90 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.
With Off1 or Off3 emergency stop modes, the ramp-down of the motor speed can be
supervised by parameters
ramp supervision delay.
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 and diagnostics
Parameters 21.04 Emergency stop mode
(page 154), 23.23 Emergency stop time
supervision (page 212) and
Events: -


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.
The motor thermal protection model fulfills standard IEC/EN 61800-5-1 ed. 2.1
requirements for thermal memory retention and speed sensitivity. The estimated
temperature is retained over power down. Speed dependency is set by parameters.
31.32 Emergency ramp supervision
(23.32 Shape time 1
(page 153),
(page 173),
31.33 Emergency ramp supervision delay
21.04 Emergency stop
23.23 Emergency
and 31.33 Emergency
and 23.33 Shape time
21.05 Emergency stop source
31.32 Emergency ramp
2) are not
(page 213).