Baumuller b maXX BM3000 - Brake Watchdog

Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
379
of 820
4
The following recommendation applies for setting the delay for the pulse inhibit, T
A
(Z134.8–):
1 If the state monitoring is switched off (Z134.1– Bit 1 = 0):
T
A
> T
1)
SignalCom
+ T
2)
mech
2 If the state monitoring is switched on (Z134.1– Bit 1 = 1) and the response signal is
reporting the state of the current through the brake:
T
A
> T
mech
– T
3)
SignalFB
3 If the state monitoring is switched on (Z134.1– Bit 1 = 1) and the response signal is
reporting the mechanical state of the brake:
T
A
= 0
1)
Processing time for the command in the controller, max. 2 ms
2)
Drop-out time of holding brakes depends on type, approx. 125-400 ms
3)
Duration of current reduction in brake coil (depends on type, approx. 30 ms) + processing time for response
in controller: max. approx. 32
ms. 
The following must apply for a correct error reaction:
Z134.7– timeout check-back signal > T
SignalCom
+ T
SignalFB
4.5.3.2 Brake watchdog
From firmware version 01.11 a hardware watchdog can be activated by the parameter
Z134.1– bit 11 for the brake. This watchdog responds at an opened brake as soon as the
controller firmware does not execute a triggering anymore due to internal errors. The re-
sponding time of the watchdog is 1 ms. The watchdog causes an automatic closing of the
brake.
The monitoring function operates inversely if the logic is inverted to the brake control.
Bit 9 of Z134.2– specifies if the current firmware provides the watchdog functionality.