II K 4-24
Overview of Software
4.4 Drive Logic
The drive logic controls the switching on and off of the
converter and the motor and protects both in excep-
tional situations, in case of fault or emergency stop.
This logic switches on the main contactor, the fans
and the field supply. The drive logic uses rising/falling
edges, i.e. it responds to 0-1 and 1-0 signal changes.
Switching on and off
The main commands for switching the drive on and off
are ON and RUN. The behaviour during switching on
and off with the default setting is described below.
Switching on
When the electronic supply has been switched on (or
after a fault) the ON and the RUN command must be
reset to "0" before logic will accept the switching on
commands.
The rising edge of the ON command switches on the
main contactor, the fans and the field supply and the
converter synchronizes itself to the mains.
The rising edge of the RUN command (starting the
drive) enables the ramp generator, the current and
speed controller and the drive accelerates to the
speed reference value on the ramp set with Accel
Ramp (5.09).
The RUN command can be set simultaneously with
the ON command.
Switching off
The falling edge of the RUN command (stopping the
drive) and Stop Mode (2.03) = Ramp brake the drive
on the ramp set with Decel Ramp (5.10), until the
actual speed has fallen below the speed set with Zero
Speed Lev (5.15). Then the current and the speed
controller will be blocked.
If Start Mode (2.09) = Flying Start is set and the RUN
command is output again during stopping the drive
will accelerate again, irrespective of the selected Stop
Mode (2.03).
If Start Mode (2.09) = Flying Start is set and the drive
is switched off with the ON command (RUN=1) only
switching the drive on will require only the rising edge
of the ON command. If the drive has not yet come to
a standstill, the drive will accelerate from the actual
speed.
The pulses are blocked with the falling edge of the ON
command, 200 ms will pass, the main contactor, the
fans and the field supply will be switched off and
hence the drive will be disconnected from the mains.
This command is also effective when the drive is
running, braking or has already come to a standstill.
Other behaviour during switching on and off
Switching off modes other than the default setting can
be selected with Stop Mode (2.03):
If Stop Mode (2.03) = Torque Lim, the internal speed
reference is set to 0 rpm and speed controller brakes
the drive along the torque and/or current limit. This
requires the balancing of the speed controller before
braking. After the minimum speed has been reached
the pulses are blocked, the main contactor, the fans
and the field supply are switched off and thereby the
drive is disconnected from the main.
Stop Mode (2.03) = Coast blocks the pulses and the
drive is coasting without control.
If Start Mode (2.09) = Start from Zero is set and the
RUN command is output again during stopping this
command will be ineffective, i.e. the drive will not start
again by itself after the minimum speed has been
reached. Only if the RUN command is reset and set
again during standstill the drive can be started again.
Switching off with emergency stop
In addition to ON or RUN the drive can be stopped with
the Eme Stop command. The procedure is as follows
with the default values:
The falling edge of the Eme Stop command generates
the warning Eme Stop Pending (A09). At the same
time the drive is braking on the ramp set with Eme
Stop Ramp (5.11) until the actual speed has fallen
below the speed set with Zero Speed Lev (5.15)
(minimum speed). Current and speed controllers are
blocked, the main contactor, the fans and the field
supply are switched off and thereby the drive is
disconnected from the mains.
Neither the ON nor the RUN command is effective in
this phase. Only upon reaching the minimum speed,
can the drive be restarted with the rising edge of the
ON and the RUN command.
Switching off behaviour at emergency stop
Eme Mode Stop (2.04) allows the selection of other
switching off modes than those provided by the de-
fault setting.
If Eme Stop Mode (2.04) = Torque Lim is set the
internal speed reference value is set to 0 rpm and the
drive will brake along the torque or current limit via the
speed controller. this requires the balancing of the
speed controller before braking. The pulses are
blocked, the main contactor, the fans and the field
supply are switched off and thereby the drive is
disconnected from the mains after the minimum speed
has been reached.
Содержание DCS 400
Страница 1: ...II K 1 1 DCS Thyristor power converter for DC drive systems 20 to 1000 A 9 to 522 kW Manual DCS 400 ...
Страница 24: ...II K 3 14 Technical data ...
Страница 29: ...II K 4 5 Overview of Software ...
Страница 158: ...II K 6 36 Operating Instructions ...
Страница 181: ...II K B 1 Appendix B Declaration of conformity ...
Страница 190: ...Notices ...
Страница 191: ...Notices ...