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4. Functional safety engineering
80
Festo.P.BE-CMMS-ST-HW-EN 0903b
Timing diagram: activating the SS1 function
Controller
release
Drive is moving
1
0
1
0
1
0
1
0
Holding brake
current-carrying
1
0
DOUT0 : READY
Output stage release
1
0
tx
Motor
controlled
ty
1
0
UZK+
tz
tx
= x ms (dependent on brake ramps)
ty
= x ms (dependent on set switch-off delay)
tz
= t(PNOZ XV2p)
Fig. 4.2 Behaviour when the controller enable is switched off
The switch off delay ty takes off as soon as a standstill is recognised by the motor
controller.
Setting the switch-off delay
The switch-off delay of the holding brake must be set in the FCT. The set time is necessary,
as the brake does not close immediately due to the mechanical design. If this set time = 0
or <= 10 ms, the vertically hanging load can briefly slip through.
Parameterisation example FCT
Circuitry example