Safety function blocks
520
02/16 MN05013001Z EN
The enable parameter stays in the default setting, the oper-
ating mode is set to AST, Automatic Start without manual
restart, the maximum zero speed rotation frequency is 2 Hz.
The signal diagram of the function block for this application
shows the dependence of the enable contact ZM01QS on the
measured frequency at the function block coils ZM01I1 and
ZM01I2:
Figure 275:
Zero speed monitoring example: signal diagram
ZM01 NEN AST *
*** ***
>FR
2
Hz
ZM01SA
ZM01QS
ZM01ER
ZM01I2
ZM01I1
a
b
c
d
a
The speed is more than 10 rpm, ZM01QS signals: “no
standstill”.
b
,
c
The speed is less than 10 rpm, ZM detects the standstill
and closes contact ZM01QS.
d
The speed of the motor increases and exceeds 10 rpm
+ 5 % hysteresis (= 11 rpm). ZM01QS opens and thus
no zero speed indicated.
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