Lenze E94AYAE SM301 - Manual (Page 74)

Safety engineering
Safety functions
Safe direction
1
l
74 EDS94AYAE EN 7.0
1.3.10 Safe direction
1.3.10.1 Description
Safe Direction / SDI
This function monitors safe compliance with an adjustable direction of movement.
Monitoring also includes zero speed with a tolerance window.
If the valid direction of rotation is not complied with, optionally SS1, SS2, or STO can be
activated.
After the adjustable delay time has expired (C15341), the function monitors the
compliance with the positive/negative direction of movement.
When operating within the limit values (C15342), the "SDIxxx monitored" status is set
(C15000). The status can be assigned to the safe output (C15052/1). The status can also be
reported via the safety bus.
If deviations from the permissible direction of movement occur, an error stop will be
triggered. As an error response, STO, SS1, or SS2 can be set (C15343). In the event of an error
the maximum change in position is displayed (C15344).
t
n
0
1
t
S
2
SDIpos
1
SDIpos
2
0
0
I
I
t
t
 ‚
t1
t 0
I
0
SMxDIASLS
0 Input signal of the request of a safety function
’1’ Logic signal level "1" / "TRUE"
1 Direction of movemtn of the motor
tx Action instant
t Time axis
t
s
Delay time
2 Feedbacks
SDIpos1 SDIpos active
SDIpos2 SDIpos monitored
 Error response − triggering motion range
‚ Adjustable SDI tolerance threshold
)
Note!
If the SDI delay time (C15341) is parameterised greater than zero, either the
"SDIxxx monitored" feedback must be evaluated (safety bus or safe output) or
the risk analysis must show that the delay is not hazardous. This fact must e.g.
be considered in the calculation of the safety clearance.