Schneider Electric Altivar 58 VW3-A58101 Uživatelský manuál stáhnout pdf (Strana 71)

VVDED397047US R8/01 ALTIVAR

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58 Keypad Display

08/01 Chapter 2 — Menus

(For a 50 Hz supply: Ns = 3000 rpm for a motor with two poles,

1500 rpm for a motor with four poles, 1000 rpm for a motor with six

poles, and 750 rpm for a motor with eight poles.

For a 60 Hz supply: Ns = 3600 rpm for a motor with two poles,

1800 rpm for a motor with four poles, 1200 rpm for a motor with six

poles, and 900 rpm for a motor with eight poles.)

Example calculation: for a motor with four poles, 1430 rpm given on

the rating plate, and a 50 Hz supply

g = (1500 – 1430) / 1500 = 0.0466

Brake release frequency = 0.0466 x 50 = 2.4 Hz

• Brake release current (Ibr):

Adjust the brake release current to the nominal current indicated on

the motor.

NOTE: The values indicated (release current and release frequency)

correspond to theoretical values. If during testing, the torque is

insufficient using these theoretical values, retain the brake release

current at the nominal motor current and lower the brake release

frequency (up to 2/3 of the nominal slip). If the result is still not

satisfactory, return to the theoretical values and then increase the

brake release current (the maximum value is imposed by the speed

controller) and increase the brake release frequency gradually.

• Acceleration time:

It is advisable to set the acceleration ramps to more than

0.5 seconds. Ensure that the drive controller does not exceed the

current limit.

The same recommendation applies for deceleration. A braking

resistor should be used on overhauling loads.

• Brake release delay (brt):

Adjust according to the time required for the mechanical brake to

open.

• Brake engage frequency (bEN):

Set to twice the nominal slip (in our example 2 x 2.4 = 4.8 Hz). Then

adjust according to observed results.

• Brake engage delay (bEt):

Adjust according to the time required for the mechanical brake to

close.

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Schneider Electric Altivar 58 VW3-A58101 Uživatelský manuál Strana 71