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Safety function blocks
442
02/16 MN05013001Z EN
• If both function block coils receive a synchronous signal, a
fault is indicated and the enable may possibly be removed.
• After each change of easySafety into operating state RUN
the two sensors can issue the same level without a fault
message being generated. In operating mode AST contact
OM..QS is closed at that time.
Only when the first edge is detected at one of the two
inputs IS1/IS2 does the function block signal a fault if both
sensors output the same level. Contact OM..QS then
opens.
The speed is determined by the frequency measured. The
frequency depends on the number of pulses per rotation:
With a gear wheel on a shaft with 6 cams and a maximum
speed of 800 rpm, the maximum rotation frequency FR is
calculated using the formula:
f [Hz] = C * n[rpm] / 60
80 Hz = 6 * 800 [rpm] / 60
If the set frequency is exceeded, the enable for the drive is
removed. The enable is issued again in the following cases:
• After the reset coil OM..RE has picked up at zero speed.
• In AST - automatic restart without manual restart - if the
actual rotation speed is below the set rotation speed by at
least 5 %.
j
Danger!
In order to avoid unexpected restarts, use Manual Start
(MST) or Controlled Start (CST) operating mode.
Содержание easySafety
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