simoreg 6ra70 dc master

2
SIMOREG 6RA70 DC MASTER
System Overview
Design and mode of operation
■ Functions of inputs and outputs
Binary inputs
Switch-on/Shutdown (OFF1)
via terminal 37.
This terminal function is ANDed
with the control bit of the
serial interface. With an H signal
applied to terminal 37, the
main contactor (terminal 109/
110) is energized via an internal
sequence control. If an H
signal is applied to terminal 38
(enable operation), then the
controllers are enabled. The
drive accelerates at the speed
setpoint up to operating
speed. With an L signal at terminal
37, the drive is decelerated
along the deceleration
ramp down to speed n < n min
and when the brake control
delay has expired, the controllers
are disabled and the main
contactor is de-energized
when I = 0. The field current is
then reduced to its standstill
value (parameterizable) after
a parameterizable delay following
main contactor dropout
has expired.
Enable operation via
terminal 38
This function is ANDed with the
control bit of the serial interface.
The controllers are enabled
with an H signal applied
to terminal 38. With an L signal
at terminal 38, the controllers
are disabled and, at I = 0, the
pulses are disabled too. The
“Enable operation” signal has
high priority, i.e. if it changes
to “L” during operation, the
effect is always I = 0, causing
the drive to coast to a standstill.
2/10
Siemens DA 21.1 · 2006
Binary selectable inputs:
Further binary input terminals
are provided for optional function
selections. A binector number
is assigned to each
assignable-function terminal for
use for control functions.
Examples of binary input
functions:
Voltage disconnect
(OFF 2): With an OFF 2 (L signal),
the controllers are disabled
instantaneously, the
armature circuit current is
reduced and when I = 0, the
main contactor is de-energized.
The drive coasts down
in an uncontrolled manner.
Fast stop (OFF 3): With a fast
stop (low) signal, the speed
setpoint at the speed controller
input is set to zero and the
drive is braked along the current
limit (separate current limit
can be parameterized for
fast stop). When n < nmin is
input, on expiry of the brake
control delay time, I = 0 is input
and the main contactor is
deactivated.
INCH: The inching function is
available with an L signal at
terminal 37, an H signal at terminal
38 and activation of
inching mode. In active inching
mode, the main contactor
is energized and the drive is
accelerated to a parameterized
inching setpoint. When
the inching signal is cancelled,
the drive is braked
down to n < nmin; the controllers
are then disabled and the
main contactor is de-energized
after a parameterizable
delay (0 to 60 s) has elapsed.
It is also possible to select
whether the ramp function
generator must be active in
inching mode or whether a
ramp-up time = ramp-down
time = 0 should be applied.
Binary outputs
Selectable signaling functions
are available at binary output
terminals (open emitter output).
Any binector quantity, chosen
by the appropriate selection parameter,
can be output at each
terminal. The polarity of the output
signal and a settable delay
(0 to 15 s) can also be parameterized.
Examples of binary output
functions:
Fault: An L signal is output
when a fault message is
active.
Alarm: An L signal is output
when an alarm is active.
n < nmin : An H signal is output
at speeds of less than nmin. This signal is used, for example,
to activate a “zero speed”
message.
Switch-on command for a mechanical
brake: A motor brake
can be activated via this signal.
When the drive is switched on
with the “Drive ON” function and
“Enable operation” signal, an
H signal is output to release the
brake; output of the internal
controller enable signal is delayed
for a parameterizable period
(corresponding to mechanical
release time). When the
drive is stopped via the “Shutdown”
or “fast stop” function, an
L signal to close the brake is
output when a speed of n < nmin is reached. At the same time,
the internal controller enable
signal remains active for a parameterizable
time period (corresponding
to mechanical
brake closing time). I = 0 is then
input, the pulses are disabled
and the main contactor is deenergized.
A further operating mode can
be selected for the “Close
brake” signal (L signal at binary
selectable output). With this
option, there is no delay until
n < nmin is reached when “Internal
controller disable” is applied
(drive is at zero current), but instead,
the (operating) brake is
activated at speeds greater
than nmin .
An internal controller disable
signal is output in response to
fault messages, voltage disconnection
or cancellation of the
“Enable operation” signal at
terminal 38 during operation.