Safe stop
Instruction handbook
b maXX
BM4400, BM4600, BM4700
Document No.: 5.12008.07
349
E
C.4
Requirements on an OSSD test pulse
The test pulses detect static error conditions in the safety-related circuits. The implementation
of the test pulses automatically takes place in the background. The drive functions and the safe-
ty functions are not affected.
The pulse enable inputs (X3-5) and the safety relays (X102-3/4, X103-3/4) of
b maXX
4000
are
provided for the use of an OSSD test pulse.
The test pulses have the following limit values:
OSSD test pulse
Figure 120:
OSSD test pulse
Thresholds for the inputs X3-5 and X102-3/4, X103-3/4:
Value
Description
t
TPLmax
3 ms
maximum low time of the test pulse
t
TPmin
100 ms
minimum period of the test pulse
Input
Threshold
X3-5
(pulse enable)
Low level:
0 V to 5 V
High level: 12 V to 28 V
X102-3/4, X103-3/4
(safety relay)
High level: 20 V to 28 V (24 V -15 % / +20 %)
Summary of Contents for b maxx BM4400
Page 359: ......
