User Manual 08/2003 Edition

5
5 Description of the Functions 02.99 04.01
5.5 SIMODRIVE POSMO A functions
Closing the brake
when withdrawing
the ”controller
enable”
5-174
Speed setpoint
Speed actual value
Output signal
”control external
holding brake”
Holding brake
n holding brake
”Internal pulse enable”
The ”controller enable” is withdrawn for the following events:
STW.0 (ON / OFF 1) = 1/0 signal
STW.2 (operating condition / OFF 3) = 1/0 signal
A fault occurs where it is possible to brake in an orderly fashion
(e.g. software limit switch actuated)
What happens if the ”controller enable” is withdrawn?
The axis is actively braked and the brake delay time started
– The axis is actively braked according to the data entered (ramp
or maximum deceleration)
– The brake delay time (P60) is started
The brake control signal is withdrawn
The brake control signal is withdrawn, if
– nact = nholding brake (P59), or
– The brake delay time (P60) has expired
Start the controller inhibit time (P61) and then cancel the pulses
1
0
1
0
1
0
Positioning
mode
P59
ÄÄÄÄ
ÄÄÄÄ
ÄÄÄÄ
Drive is actively braked
(e.g.: regenerative braking)
P60 Holding brake
brake delay time
P61 Holding brake
controller inhibit time
Time
to close the holding brake
Fig. 5-16 Closing the brake: Behavior when withdrawing ”controller enable”
Objective when
setting
OFF 1 – OFF 3 – fault
The controller inhibit time should be harmonized so that the closed–
loop control is only withdrawn after the brake has been closed. This
prevents an axis from possibly sagging.
Siemens AG 2003 All rights reserved
SIMODRIVE POSMO A User Manual (POS1) – 08.03 Edition
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