Efficient Networks S120 manual Response time with the Safe Brake Control function, 5HOD

Models: S120

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Safety Integrated basic functions 9.5 Safe Brake Control (SBC)

 

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Figure 9-1 Two-channel brake control, booksize

The Motor Module carries out a check to ensure that the "Safe Brake Control" function is working properly and ensures that, if the Control Unit fails or is faulty, the brake current is interrupted and the brake applied.

The brake diagnosis can only reliably detect a malfunction in either of the switches (TB+, TB-) when the status changes (when the brake is released or applied).

If the Motor Module or Control Unit detects a fault, the brake current is switched off and the safe status is reached.

Response time with the "Safe Brake Control" function

The following values can be specified for the response times when the function is selected/deselected via input terminals:

Typical response time

4 x Safety monitoring cycle CU (r9780) + inputs/outputs sampling time (p0799)

Max. response time in the event of a fault

8 x Safety monitoring cycle CU (r9780) + inputs/outputs sampling time (p0799)

Examples:

Assumption:

Safety monitoring clock cycle time CU (r9780) = 4 ms and inputs/outputs sampling time (r0799) = 4 ms

tR_typ = 4 x r9780 (4 ms) + r0799 (4 ms) = 20 ms tR_max = 8 x r9780 (4 ms) + r0799 (4 ms) = 36 ms

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Drive Functions

Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4

Page 314
Image 314
Efficient Networks S120 manual Response time with the Safe Brake Control function, 5HOD