ABB +Q951 Original User Manual page 10

10
Initial status: The drive is in operation and the motor(s) is running
Step Operation
1. The user activates the emergency stop with the emergency stop button [S61].
2. The emergency stop safety relay [A61] switches off the digital input (Off3) on the
drive control board (A41) giving the emergency stop command.
The emergency stop safety relay [A61] switches off the power supply for the timer
relay [K61].
The E-Stop time counter of the emergency stop safety relay [A61] starts (user-
adjustable delay).
The break delay counter of the timer relay [K61] starts (non-user-adjustable delay).
3. The drive acknowledges the emergency stop command by energizing the relay
output RO2.
The relay output RO2 bridges relay contacts of [K61] keeping the power supply for
the delayed contacts of the safety relay powered.
Note: If the drive fails to acknowledge the receivable of the emergency stop
command in 2 seconds, the STO cuts off the drive control pulses preventing motor
control and torque generation.
4. The drive decelerates the motor to zero speed in emergency stop deceleration time
(parameter setting).
5. The E-Stop time counter of the emergency stop safety relay [A61] trips and the relay
switches off the Safe torque off (STO) control signals on the drive control board
[A41]. The STO cuts off the drive control pulses preventing motor control and torque
generation.
6. At the same time, the power is taken away from relay K63. This energizes the
emergency stop indication lamp [P62].
7. Normal operation resumes after the user:
−
releases the emergency stop button [S61] to normal (up) position
−
resets the emergency stop circuit with the emergency stop reset button [S62]
(the user must push the button for 0.1 to 3 seconds)
−
resets the drive (if the STO indication parameter 31.22 has been set so that a
fault is generated)
−
makes sure that the drive has received the start signal (depends on the
configuration, see the firmware manual)
Option description and instructions
3ADW000508R0201+Q964 E-Stop cat.1 without opening mains contactor en b