Schneider Electric ALTIVAR 58 TRX Installationsanleitung PDF herunterladen (Seite 80)

Chapter 2—Menus VVDED397047USR6/03

5—I/O Menu 06/2003

Recommendations for configuring the Brake Logic control

parameters:

• Brake release frequency (brL):

Set the brake release frequency to the value of the nominal motor

slip (g) multiplied by the nominal frequency (FS) in Hz.

brL = g x FS

g = nominal motor slip

FS = nominal motor frequency (indicated on the motor nameplate)

Example Calculation:

nominal slip (g) = (Ns – Nr) / Ns

Ns = synchronous speed in rpm

Nr = nominal motor speed at nominal torque in rpm. Use the

speed indicated on the motor nameplate.

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, a nameplate

nominal speed of 1430 rpm, and a 50 Hz supply

g = (1500 – 1430) / 1500 = 0.0466

Brake release frequency (brL) = 0.0466 x 50 = 2.4 Hz

• Brake release current (Ibr):

Adjust the brake release current to the motor nameplate nominal

current.

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 drive controller) and increase the brake release

frequency gradually.

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Schneider Electric ALTIVAR 58 TRX Installationsanleitung Seite 80