Festo Контроллеры двигателя CMMS-ST - Manual (Page 84)

4. Functional safety engineering
84 Festo.P.BE-CMMS-ST-G2-HW-EN 1008NH
Restart after activated “Safe standstill”
Before switching it on again, make sure that all hazards have been eliminated and the
system can be safely placed in operation again. If there are areas inside that can be
entered, a manual acknowledgement must be made via the optional S2 button (see
switching example).
In order to switch the end stage of the CMMS-ST-G2 controller active again and thus
operate the connected motor, the following steps must occur:
1. The relay control for switching the end stage driver power supply (2nd switch-off path)
must be supplied with 24V between pin 2 and pin 3 of [X3] at time t1.
2. The driver supply is then charged.
3. The potential-free feedback contact ([X3] Pins 5 and 6) for plausibility checking of the
driver supply relay control opens a maximum of 20 ms after t1 (t2-t1) and the driver
supply is switched off.
4. Approx. 10 ms after the acknowledgment contact opens, the “H” on the display goes
out at time t3.
5. The time for the end stage enable ([X1], DIN4) is largely freely selectable (t4-t1). The
enable may occur at the same time as the relay is controlled, but it must occur
approx.10 祍 (t5-t4) before the rising edge of the controller enable ([X1], DIN5),
depending on the application.
6. The rising edge of the controller enable at time t5 releases the motor holding brake (if
present) and the end stage enable occurs. The brake can only be released when the
relay for switching the driver supply is engaged. Using the parameterising software, a
travel start delay time (t6-t5) can be set that regulates the drive at a speed of “0” for
the specified time and, after this delay, causes it to move at the set speed at time t6.
7. At time t7 the drive has reached the set speed. The requires ramp settings can be
parameterised using the FCT parameterising software.
Note
If external forces (e.g. hanging loads) have an effect on the drive,
additional measures (e.g. mechanical brakes) are necessary to
avoid hazards.
The Safe Stop 1 stop function (SS1), in which the drive is brought
to standstill in a controlled manner, is then always preferred.