Eaton easySafety Manual page 524

Safety function blocks
ZM01 NEN AST *
*** ***
>FR 2
520
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.
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:
ZM01SA
ZM01I1
ZM01I2
ZM01QS
ZM01ER
Figure 275:
a
b, c The speed is less than 10 rpm, ZM detects the standstill
d
02/16 MN05013001Z EN
a b
Zero speed monitoring example: signal diagram
The speed is more than 10 rpm, ZM01QS signals: "no
standstill".
and closes contact ZM01QS.
The speed of the motor increases and exceeds 10 rpm
+ 5 % hysteresis (= 11 rpm). ZM01QS opens and thus
no zero speed indicated.
c d