Program features 115
Safety and protections
Emergency stop
The emergency stop signal is connected to the input selected by parameter 21.05
Emergency stop source. An emergency stop can also be generated through fieldbus
(parameter 06.01 Main control word, bits 0…2).
The mode of the emergency stop is selected by parameter 21.04 Emergency 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 23.23 Emergency
stop time.
With Off1 or Off3 emergency stop modes, the ramp-down of the motor speed can be
supervised by parameters 31.32 Emergency ramp supervision and 31.33 Emergency
ramp supervision delay.
Notes:
• For SIL 3 / PL e-level emergency stop functions, the drive can be fitted with a
TÜV-certified FSO-xx safety options module. The module can then be
incorporated into certified safety systems.
• 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.
• Speed and torque reference additives (parameters 22.15, 22.17, 26.16, 26.25 and
26.41) and reference ramp shapes (23.16…23.19) are ignored in case of
emergency ramp stops.
Settings
Parameters 06.17 Drive status word 2 (page 168), 06.18 Start inhibit status word
(page 169), 21.04 Emergency stop mode (page 244), 21.05 Emergency stop source
(page 244), 23.23 Emergency stop time (page 260), 25.13 Min torq sp ctrl em stop
(page 274),
25.14 Max torq sp ctrl em stop (page 274), 25.15 Proportional gain em
stop (page 274), 31.32 Emergency ramp supervision (page 309) and 31.33
Emergency ramp supervision delay (page 310).
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