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.
82 Program features
To Next Page
Loading...
