Motor Thermal Protection - ABB ACS280 Firmware Manual

74 Program features
The mode of the emergency stop is selected by parameter
stop 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
Emergency stop time
With Off1 or Off3 emergency stop modes, the ramp-down of the motor speed
can be supervised by parameters
Emergency 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 (
not considered.
Settings and diagnostics
21.04 Emergency stop mode
Parameters
source 138
(page ),
supervision
(page
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.
.
31.32 Emergency ramp supervision
.
23.32 Shape time 1
23.23 Emergency stop time
195 31.33 Emergency ramp supervision delay
) and
23.33 Shape time 2
and
138 21.05 Emergency stop
(page ),
157 31.32 Emergency ramp
(page ),
21.04 Emergency
23.23
31.33
and
) are
196
(page ).