Eurotherm Drives 620 Com Product Manual Download

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7. Press

to stop the motor, then press

LOCAL

to put the drive back into REMOTE MODE.

8. If

the

ENCODER SIGN

needs changing, go into the

‘CONFIGURE DRIVE’

menu and select

ENCODER

SIGN

, then press

. Use the

and

buttons to set the

ENCODER SIGN

parameter to the other setting.

Press

9. This completes the initial part of the setting up phase. At this point the motor is running under control, but it is

not optimised for smooth, efficient running. The next step is to Autotune the drive to automatically set up the
remaining basic parameters.

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The purpose of the Autotune function is to set up the magnetising current and rotor time constant for this motor.

This is a two-stage process. The first stage runs the drive up to various speeds to tune the magnetisation current.
The second stage calculates the rotor time constant from the

MAG CURRENT

and motor nameplate details which

you entered.

When the Autotune is carried out, the motor will run at base speed for several minutes.

It is essential that no load is applied to the output shaft for the Autotune to function

correctly. A gearbox may be permissible provided it does not significantly load the motor, but it

should be disconnected where possible.

Ensure that you are in the

‘CONFIGURE DRIVE’

menu. Scroll around the menu with the

buttons

until you locate

AUTOTUNE

. Press

to set the

AUTOTUNE

flag

TRUE

. Then restart the drive.

The drive will now accelerate first to base speed, and then to a number of other speeds, up to the value set in

MAX SPEED RPM

. At each speed it will set up the magnetising current for this motor. When it has finished, it

will then calculate the rotor time constant. If any error messages occur on the MMI, refer to Chapter 6,
"Alarms".

If the autotune fails to run, but no error message appears on the MMI, this may be due to a wrong configuration
in the autotune menu. This menu contains 2 flags which control the autotune action. 'Mag I Autotune' must be
set true to ensure that the mag current autotune is carried out, and 'Set Tr < Rtd Spd' must be true for the rotor
time constant calculation to be done. Go into the autotune menu, under 'Setup Parameters (see 'Menu Structure'
on page4-6) and ensure these flags are set to be true.

When Autotune has finished, the 620 Vector drive is set up with all the information required for basic operation
as a speed controller. It is now necessary to save this information in non volatile memory, so that it will be
retained when power is removed. This is done via the PARAMETER SAVE menu. See 'Parameter Save' under
'Menu Structure' on page 4-6.

At the end of the autotune process, the drive will calculate a new value of rotor time constant. If it is
significantly different from the old value, it may be advisable to run the autotune again. The values of
magnetising current obtained on the second pass will then be slightly more accurate, as the drive will now be
using a more accurate value of rotor time constant.

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Disconnect the power to the drive.

Hold down the

and

buttons while re-applying power and keep both buttons depressed for at least two

seconds after power-up

Note: The start input must also be low [B7].

This manual was downloaded on www.sdsdrives.com

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