SIEMENS
SINAMICS DCM
DC Converter and Control Module
DC Converter
3/50
Siemens D 23.1 · 2014
3
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More information
(continued)
Functions of the inputs and outputs
Analog user-assignable inputs
After converting to a digital value, the quantity of the analog
inputs can be flexibly adapted via parameters for scaling, filter,
sign selection and offset input. The values are available as con-
nector. This is the reason that the analog inputs can be effective
as main setpoint and also as quantity for a supplementary
setpoint or a limit.
Analog outputs
Selectable analog outputs are available to output analog
signals. Analog signals can be output as bipolar signal or as
absolute value. In this case, scaling, an offset, polarity and a
filter time can be parameterized. The required output quantities
are selected at the intervention points by entering connector
numbers. For instance, speed actual value, ramp-function
generator output, current setpoint, line supply voltage etc.
can be output.
Binary inputs
•
Switch-on/shutdown (OFF 1)
This terminal function is ANDed with the control bit of the serial
interface. For an H signal at terminal
switch-on/shutdown
, the
main contactor closes via an internal sequence control. The
controllers are enabled if there is an H signal at the operating
enable terminal. The drive accelerates up to the operating
speed with the speed setpoint. For an L signal at the terminal
switch-on/shutdown
, the drive is ramped down to speed
n
<
n
min
via the ramp-function generator; after the brake con-
trol delay time, the controllers are inhibited and at
I
= 0, the
main contactor is opened. After this, after an adjustable time
after the main contactor has dropped out, the field current is
reduced to the standstill field current (this can be parameter-
ized). The standstill field can e.g. be used as anti-condensa-
tion heating for the motor; to do this, approximately 30 % of the
rated field current must be entered as standstill field. The mo-
tor fan must be operational for a field current of 100 % of the
rated field current. Otherwise, the field winding will be over-
loaded.
•
Operating enable
This function is ANDed with the control bit of the serial inter-
face. The controllers are enabled with an H signal at the
oper-
ating enable
terminal. For an L signal, the controllers are inhib-
ited and at
I
= 0, the pulses are inhibited. The signal
operating
enable
has a high priority; this means that if the signal (L sig-
nal) is withdrawn in operation, then this always results in
I
= 0
and therefore the drive coasts down.
Binary user-assignable inputs:
Additional binary input terminals are available for user-assign-
able functions. In this case, a binector number is assigned to
every user-assignable terminal, which can be used for control
functions.
Examples of binary input functions:
•
Voltage disconnect (OFF 2): For OFF 2 (L signal), the control-
lers are instantaneously inhibited, the current in the armature
circuit is reduced and at
I
= 0, the main contactor is opened.
The drive coasts down uncontrolled.
•
Quick stop (OFF 3): For a quick stop (L signal), the speed set-
point at the speed controller input is set to zero and the drive
is braked along the current limit for quick stop (parameteriz-
able). At
n
<
n
min
after the brake control delay time
I
= 0 is
entered and the main contactor is opened.
•
Jogging: The jogging function is available for an L signal at
terminal
switch-on/shutdown
, for an H signal at terminal
oper-
ating enable
and when the jogging function is controlled. In
this case, the main contactor is closed and the drive acceler-
ates up to the jogging setpoint defined in a parameter. When
the jogging signal is withdrawn, the drive is braked to
n
<
n
min
;
after this, the controllers are inhibited and the main contactor
is opened after a parameterizable time (0 to 60 s). Further, it
can be selected as to whether the ramp-function generator is
active or ramp-up time = ramp-down time = 0 is used.
Binary outputs
User-assignable signaling functions are available at the binary
output terminals (open emitter output). Any binector quantity,
which can be selected via the associated user-assignable
parameter, can be output for each terminal. The polarity of the
output signal and an adjustable delay time (0 to 10 s) can be
selected using parameters.
Examples of binary output functions:
•
Fault: An L signal is output when a fault message is present.
•
n
<
n
min
: An H signal is output for speeds less than
n
min
.
This signal is used, for instance, as a zero speed signal.
•
Switch-on command for a mechanical brake: A motor brake
can be controlled using this signal.
When switching on the drive using the "switch-on" function and
entering "operating enable", an H signal is output to open the
brake, in this case, the internal controller enable is delayed by a
parameterizable time (wait for the mechanical brake opening
time to expire). When shutting down the drive using the "shut-
down" function or "quick stop", an L signal is output to close the
brake when speed
n
<
n
min
is reached. At the same time, the
internal controller enable is present for a parameterizable time
(wait for the mechanical brake closing time to expire): When
I
= 0 is entered, the pulses are inhibited and the main contactor
is opened.
An additional operating mode can be selected using the "close
brake" signal (L signal at the binary user-assignable output). As
a consequence, when the "internal controller inhibit" is present
(the drive is in a no-current condition), the drive does not wait for
the status
n
<
n
min
, but the brake is already controlled (operating
brake) at speeds greater than
n
min
.
Internal control inhibit is present when a fault message occurs,
when the voltage is disconnected or the operating enable –
terminal
operating enable
– is withdrawn in operation.
© Siemens AG 2014