Pilz PNOZ m EF 2MM - Manual (Page 11)

Function description
Operating Manual PNOZ m EF 2MM
1003107­EN­01 11
} Tolerance time (t1), which takes into account the length of the overshoots (maximum
time for which the limit value may be exceeded)
} Tolerance period (t2), which takes into account the oscillation period (minimum time
that must elapse between one limit value overshoot and the next)
} Tolerance amount (%), which takes into account the size of the overshoots (maximum
permitted percentage by which the configured limit values may be exceeded)
t
v
SSM
SSM
t
s
t
e
Tolerance amount (%)
Limit
Speed +
Limit
Speed -
Tolerance amount (%)
Legend:
} t
e
: Activation of the safety function SSM
} t
s
: Speed v exceeds the limit value and activates the tolerance range (tolerance time,
tolerance period, tolerance amount)
} t
1
: Tolerance time
} t
2
: Tolerance period
} Tolerance amount (%): Tolerance amount of limit value in both directions
Safe speed range monitoring
The "safe speed range monitoring" function (SSR­M) monitors the current speed to ensure
it stays within a maximum and minimum permitted limit value.
If the speed is outside the configured range, the output switches off. As soon as the speed
returns to within the configured range (plus hysteresis), the output switches back on.
A tolerance range may also be set for the limit values used to monitor the speed range.
This tolerance range modifies the set limit values. As a result, one­off or periodic over­
shoots that exceed the range limits can be tolerated.
The following values can be configured for the tolerance range:
} Tolerance time (t1), which takes into account the length of the overshoots (maximum
time for which the limit value may be exceeded)
} Tolerance period (t2), which takes into account the oscillation period (minimum time
that must elapse between one limit value overshoot and the next)