TDE MACNO MINIOPD EXP User Manual page 37

2.3.1.2.1 CONTINUING TO WORK (C34=0; DEFAULT)
This operating procedure is adapted to those applications in which it is fundamental to have
unchanged working conditions in each situation. Setting C34=0 the drive, even if the mains supply
voltage is no longer available, continues to work as though nothing has been modified over the
control, pulling the energy from the present capacitor to the inner drive. This way making the
intermediate voltage of the DC Bus will begin to go down depending on the applied load; when it
reaches the minimum tolerated value (in parameter P106) the drive goes into alarm A10 of minimum
voltage and leaves to go to the motor in free evolution.
Therefore, this function will allow exceeding short-term mains break out
milliseconds on the basis of the applied load) without changing the motor operation in any way.
540V
400V
Break mains
If the alarm condition starts, there is the possibility to enable, setting C35=1 the alarms to an
automatic reset at the mains restore.
2.3.1.2.2 RECOVERY OF KINETIC ENERGY (C34=1)
This operating procedure is adapted to those applications in which it is temporarily possible to reduce
the speed of rotation to confront the mains break. This function particularly adapts in the case of
fewer applied motors and with high energy.
The qualification of such a function is obtained setting C34=1.
During the mains break out, the voltage control of the DC Bus is achieved using a proportional
regulator, with fixed proportional gain set in P86 (default=3.5), that controls the DC Bus voltage d24,
compare it with the threshold in P98 (default=600V) and functions on the torque limits d30 of the
motor that, in time, will slow down to work in recovery. Such regulation, when qualified (C34=1), at
mains break out (o.L.12=H) or if the DC Bus voltage goes below the threshold set in P97 (425V),
replaces the normal regulation (o.L.13=H) and is excluded when mains supply is on.
User's manual
Minimum voltage
allowed (P106)
Return
mains
(tenths/hundredths of
DC bus voltage
speed
C34=0
Continue to work
time
37