16
5.2.2 Manual operation
In this operating mode, the outputs of the device are only switched if the input
frequency is above the switch point Fu and after the restart signal has been sent
to the device via an external restart command element�
When the underspeed has been detected, the current paths are open�
Power
supply
Safety
output
Fu
Fuh
f in
t
ON
ON
Restart
signal
10 s
10 s
Manual operation
1: Voltage supply of the unit
2: Restart signal
3: Current paths (safety-related outputs)
In manual operation the current path remains open until there is a restart signal on
input Y5� The restart signal is activated via a falling edge on input Y5 (a complete
transition 0 V DC → + 24 V DC → 0 V DC ).
This signal is only active if the frequency exceeds the Fuh value�
The restart signal must be applied for 0�3���5 s� Otherwise the command is
rejected�
If the restart command is activated while the frequency is between Fu and
FuH, the command is rejected� This applies both to the rising and the falling
edge�
