ABB ACS880 Series, Firmware Manual

Page: 119 / 764

1.6 4.8 8 11.2 14.4
U
DC
f
out
T
M
U
DC
(V DC)
f
out
(Hz)
T
M
(Nm)
160 80 520
120 60 390
80 40 260
40 20 130
t
(s)
U
mains
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.
Automatic restart
WARNING!
Before you activate the function, make sure that no dangerous situations
can occur. The function restarts the drive automatically and continues
operation after a supply break.
It is possible to restart the drive automatically after a short power supply failure
by using the Automatic restart function provided that the drive is allowed to run
for a time defined by parameter
21.18 to restart time 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.
Program features 119