Operating instructions

Functions
5.10 Technological functions
CU240S and CU240E Control Units, FW 3.2
Operating Instructions, 03/2009, A5E02440075B AA
139
WARNING
Secure loads held by the brake!
Since this procedure cancels the "Brake active" signal which, in turn, causes the brake to
be forced open, the user must ensure that, even when the motor has been powered-down,
all loads held by the brake are secured before the signal is canceled.
Table 5- 56 Parameter to force open a motor holding brake
Parameter Description
P0003 = 3 Enable expert access to parameters
P1218 = 1 Forcibly open the motor holding brake
5.10.2 Automatic restart and flying restart
5.10.2.1 Flying restart: switching on the converter when the motor is running
Description
The "flying restart" function, which is activated by P1200, allows the inverter to be switched
to a rotating motor. The function must be used whenever a motor may still be running. This
could be:
● After a brief line interruption
● When an inverter is shut down but air currents cause a fan impeller to rotate (either CW
or CCW)
● If the motor is driven by a load
This function is useful, therefore, with motors whose load exhibits a high moment of inertia
since it can help prevent sudden loads in the mechanical components.
If this function is not used in such cases, this could cause the motor to shut down due to
overcurrent (overcurrent fault F0001).
The "flying restart" function can be used to synchronize the inverter and motor frequency.
WARNING
Drive starts automatically
When this function is enabled (P1200 > 0), all those working with the system must be
informed of the following:
• The drive starts automatically.
• Although the drive is at a standstill, it can be started by the search current.