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Issue 08/03
5.9

Other Commonly Used Features

5.9.1 Flying Restart
It is possible that your motor may be spinning when you enable the drive, e.g. it is being driven by the
load (quite common with fan applications), then it will be necessary to enable the flying restart feature.
Flying restart searches for the speed of the motor and once found, the drive will adjust the output
frequency according to the setpoint.
There are a number of options in the flying restart parameter P1200.
Possible Settings:
0 Flying start disabled
1 Flying start is always active, start in direction of setpoint
2 Flying start is active if power on, fault, OFF2, start in direction of setpoint
3 Flying start is active if fault, OFF2, start in direction of setpoint
4 Flying start is always active, only in direction of setpoint
5 Flying start is active if power on, fault, OFF2, only in direction of setpoint
6 Flying start is active if fault, OFF2, only in direction of setpoint
For a full explanation of these settings and the more advanced tuning facilities please see the
descriptions for P1200, P1202, P1203 in the parameter list (on the supplied CD).
NOTE
Useful for motors with high inertia loads.
Settings 1 to 3 search in both directions.
Settings 4 to 6 search only in direction of setpoint.
NOTE
Flying start must be used in cases where the motor may still be turning (e.g. after a short line
interruption) or can be driven by the load. Otherwise, overcurrent trips will occur.
5.9.2 Auto-Restart (P1210)
After a power failure (F0003 "Undervoltage"), the "Automatic restart" function (enabled using P1210)
automatically powers-up the drive again. Any faults are automatically acknowledged by the drive.
When it comes to power failures (line supply failure), then a differentiation is made between the
following conditions:
Line Undervoltage (brownout)
"Line undervoltage" is a situation where the line supply is interrupted and returns before (if installed)
the BOP display has gone dark (this is an extremely short line supply interruption where the DC link
hasn't completely collapsed).
Line Failure (blackout)
"Line failure" is a situation where the display has gone dark (this represents a longer line supply
interruption where the DC link has completely collapsed) before the line supply returns.
The automatic restart function P1210 is shown in the following diagram (refer to Table 5.1) as a
function of external states / events.
60
Quick Start Guide
MICROMASTER 440
6SE6400-5GA00-0BP0

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Mm440

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