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3.2 Safe state of the output relays
Output relays are de-energised� Current paths are open�
3.3 Switching function "Overspeed"
The output relays de-energise when the event occurs (selected frequency Fo
reached)� The relays switch on again when the value falls below the preset value
reduced by hysteresis (Foh)�
Characteristics of the safety outputs (current paths)
The NO contacts of the internal relays are connected in series and connected to
the terminals� If both relays are energised, the current paths are closed so that, for
example, a power contactor can be controlled�
If the switch point is exceeded, the current paths open�
3.4 Hysteresis
The hysteresis determines the difference between the switch point (current paths
open) and the switch-on point (current paths close)�
The hysteresis value is fixed at 5 %�
If the input frequency falls below the set switch point by 5 %, the relays energise
again and the current paths are closed�
Example switch point Fo = 10 (Hz):
• The current paths open when Fo has been exceeded (rising frequency)�
