Watson-Marlow MM420 User Manual

Page 155

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Issue 10/06

3 Functions

MICROMASTER 420 Operating Instructions

6SE6400-5AA00-0BP0

155

After the magnetizing time P0346 has expired, the ramp-function generator is set to
the speed actual value and the motor is operated with the actual reference
frequency.

Setpoint frequency

t

f

f

Ramp up

Magnetizing

time

P0346

Demagnetizing

time

P0347

Flying restart

P1202
P1203

search,max

Fig. 3-66

Flying restart

NOTE

If a higher value is entered for the search velocity P1203 this results in a flatter

search curve and therefore to an extended search time. A lower value has the
opposite effect.

For "Flying restart", a braking torque is generated which can cause drives, with

low moments of inertia, to brake.

For group drives, "Flying restart" should not be activated due to the different

characteristics of the individual motors when coasting down.

WARNING

When "Flying restart" is activated (P1200 > 0), although the drive is at a stand-

still and the setpoint is 0, it is possible that the drive is accelerated as a result of
the search current !

If the operating range of the motors is entered when the drive is in this state,

this can result in death, severe injury or material damage.

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