Siemens Micromaster 420 Operating Instruction page 75

5. SYSTEM PARAMETERS
Parameter
Number
P1200 Start on the fly
Starts inverter onto a spinning motor.
If it is possible that the motor is still spinning e.g. after a short mains break, or if the motor
can be driven by the load then flying restart must be used – otherwise overcurrent trips will
occur.
This function is particularly useful for motors with high inertia loads.
Possible Settings:
0 "flying restart inactive"
1 "flying restart always active", starts in setpoint direction
2 "flying restart on power up, fault, OFF2", starts in setpoint direction
3 "flying restart on fault, Off2", starts in setpoint direction
4 "Flying restart always active. Search ONLY in setpoint direction."
5 "flying restart on power up, fault, OFF2, Search ONLY in setpoint direction
6 " Flying restart on fault, off2, Search ONLY in setpoint direction."
7
(F
F out
P1202
(level 3)
I out
I in
It does this by rapidly changing the output frequency of the inverter until the actual motor
speed has been found. Once this happens, the motor will run up to its setpoint using the
normal ramp time.
Note:
Settings 1 to 3 search in both directions. In order to search only in direction of setpoint it is
necessary to set 4 to 6.
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0
Parameter Name
+ 2 )
max fslip nom
rate set by P1203 (level 3)
'ramps to set tpoint with
normal ramp'
time
International English
♦ ♦ ♦ ♦ P0003 User
Min
Access Level
Max
♦ ♦ ♦ ♦ P0004 Setting
[Default]
♦ ♦ ♦ ♦ Changeable
Units
♦ ♦ ♦ ♦ Status
0 2
6 12
[0]
'•'
-
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