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T
f
U
M
out
DC
(Nm)
(Hz)
(V DC)
160
80
520
120
60
390
80
40
260
40
20
130
U
= intermediate circuit voltage of the drive, f
DC
T
= motor torque Loss of supply voltage at nominal load ( f
M
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
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.
1.6
4.8
21.18
to restart time without the cooling fans
Program features 119
8
11.2
= output frequency of the drive,
out
out
U
mains
U
DC
f
out
T
M
t
(s)
14.4
= 40 Hz). The
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