ABB ACS880 ESP, Руководство по прошивке

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80 Standard programposi features
Note:
Units equipped with a main contactor must be equipped with a hold circuit
(example UPS) to keep the contactor control circuit closed during a short supply
break.
Automatic restart
It is possible to restart the drive automatically after a short (maximum 5 seconds)
power supply failure by using the Automatic restart function provided that the drive is
allowed to run for 5 seconds without the cooling fans operating.
When enabled, the function takes the following actions upon a supply failure to
enable a successful restart:
• The undervoltage fault is suppressed (but a warning is generated)
• Modulation and cooling is stopped to conserve any remaining energy
• DC circuit pre-charging is enabled.
If the DC voltage is restored before the expiration of the period defined by parameter
21.18 Auto restart time and the start signal is still on, normal operation will continue.
However, if the DC voltage remains too low at that point, the drive trips on a fault,
3280 Standby timeout .
130
260
390
520
1.6 4.8 8 11.2 14.4
t (s)
U
DC
f
out
T
M
U
DC
= intermediate circuit voltage of the drive, f
out
= output frequency of the drive, T
M
= motor torque
Loss of supply voltage at nominal load ( f
out
= 40 Hz). The intermediate circuit DC voltage drops to the
minimum limit. The controller keeps the voltage steady as long as the mains is switched off. The drive runs
the motor in generator mode. The motor speed falls but the drive is operational as long as the motor has
enough kinetic energy.
U
mains
20
40
60
80
40
80
120
160
U
DC
(V DC)
f
out
(Hz)
T
M
(Nm)