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02.99
04.01
Closing the brake
The "pulse enable" is withdrawn when the following events occur:
when the "pulse
S
enable" is
S
withdrawn
S
What happens if the "pulse enable" is withdrawn?
When the pulse enable is withdrawn, the drive coasts down, and the
"open holding brake" output signal is canceled.
The motor "coasts" down until the brake becomes effective mechani-
cally and brings the motor to a standstill.
After the time taken for the brake to close, the drive is braked by the
motor holding brake.
"Pulse enable"
Output signal
"control external
holding brake"
Speed setpoint
Speed actual value
Holding brake
Fig. 5-19 Closing the brake: Behavior when withdrawing "pulse enable"
Warning
!
When this type of braking is used, it subjects the holding brake to
mechanical wear and therefore should only be seldomly used.
E Siemens AG 2013 All Rights Reserved
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
STW.1 (operating condition/OFF 2) = 1/0 signal
STW.3 (operation enabled/operation inhibited) = 1/0 signal
A fault occurs, where it is no longer possible to brake in a controlled
fashion (e.g. encoder fault)
Positioning mode
1
0
1
0
Ä Ä Ä Ä Ä
1
Ä Ä Ä Ä Ä
0
Time
to close the holding brake
5 Description of the Functions
5.5 SIMODRIVE POSMO A functions
OFF 2 – operating inhibit – fault
The drive "coasts" down
The drive is braked by the
holding brake
5
t
t
t
t
t
5-191
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