Lenze 8200 Frequency inverters - Manual (Page 186)

Configuration
8200SHB0199 7-49
7.5.13 Start conditions/flying-restart circuit
Code Name Possible settings IMPORTANT
Lenze Choice Info
C142 ¤ Start condition -1- -0- Automatic start inhibited,
flying-restart circuit not active
-1- Automatic start, if term. 28 HIGH,
flying-restart circuit not active
-2- Automatic start inhibited,
flying-restart circuit active
-3- Automatic start, if term. 28 HIGH,
flying-restart active
Function Determines the controller performance after mains connection or reconnection. With activated
flying-restart circuit, the controller automatically synchronises to a coasting motor after mains
disconnection. For this, the controller calculates the output frequency required for the current speed
of the coasting motor, the controller is then connected and accelerates the motor to the selected
setpoint. Steady and soft deceleration and acceleration is therefore possible.
Drive performance Start options with flying-restart circuit
- C142 = -0-
- After mains disconnection, the drive does not start before LOW/HIGH level change at the input
ctrl. enable (term. 28). The operating module displays AS_LC (Autostart-Lockout).
- C142 = -1-
- After mains disconnection, the drive starts automatically if a HIGH level is assigned to.
Start options with flying-restart circuit
- C142 = -2-
- Start with flying-restart circuit after a LOW/HIGH level change at input ctrl. enable (term. 28).
The operating module displays AS_LC.
- C142 = -3-
- Automatic start with flying-restart circuit, if a HIGH level is assigned to ctrl. enable.
Important - The flying-restart circuit must not be used, if several motors with different inertias are connected
to a controller.
- The flying-restart circuit does only search the selected direction of rotation for the
synchronisation.
- The flying restart works properly for drives with high moments of inertia.
- Machines with low moments of inertia and small friction:
- With activated flying-restart circuit, the motor can start briefly or reverse from standstill after
enabling the controller.
Series “HVAC”: - The flying-restart circuit must only be used during operation with a PID controller, if a speed
proportional signal is assigned to C0051!
- With a normalisation to an application datum (see page 7-63), it is absolutely necessary to
check whether C0051 contains a speed proportional value.
Note!
If the flying-restart circuit is not required for every drive start, but only after mains
reconnection:
-
bridge terminal 28 and start the controller with the “QSP” function (C142 = -3-
and C106 = 0 s),
-
the flying-restart circuit is now only activated for the first mains connection.
Show/Hide Bookmarks