HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 135 of 189
Version: 50F
6.2 Response times for FAST_CHANNEL
FAST_CHANNEL refers to a property of the PSC1 to react faster to speed requirements than
is possible on processing the safety program in the normal cycle (= 8 ms). The sampling time
of the FAST_CHANNEL is 2 ms + 2 ms for signalling on bus.
The following response times can be stated:
4 ms (worst-case condition)
Safety instructions:
On the usage of the FAST_CHANNEL it is to be noted that a shutdown in the time
stated above for a specified speed threshold can only occur if the sensor information is
of adequate resolution. The smallest resolvable switching threshold for the
FAST_CHANNEL requires at least 2 edge changes on the selected sensor system
within a time of 2 ms.
This function is only possible on the usage of safe semiconductor outputs.
The FAST_CHANNEL must not act on SSI listeners
6.3 Response times for overspeed distance monitoring
For the calculation of the worst-case condition, there is the following calculation scheme:
System speed at sampling point: V(t)
System speed on response from the PSC1: V
A
(tTheshold for monitoring (SLS or SCA ): V
S
= constant for all t
Filter value configured: XF = constant for all t
Maximum possible acceleration for the application: a
F
= constant for all t
Delay after shutdown: a
V
= constant for all t
Sampling point for occurrence of worst-case event: T
Fault
Response time of the PSC1 system: t
Resp
For the worst-case assessment it is assumed that the drive is initially moving at a speed v(k)
exactly at the threshold configured v0 and then accelerates with the maximum possible value
a0.
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