96
Operating Instructions – MOVITRAC® B
5
Communication and unit profile
Startup
For safety reasons, the basic control block is defined in such a way that the frequency
inverter with the control word setting 0000
hex
will assume the state
No enable
because
all commercially available fieldbus master systems will reset the outputs to 0000
hex
in
the event of a fault. In this case, the frequency inverter will execute a rapid stop and then
activate the mechanical brake.
Control commands
Controlling the fre-
quency inverter
with bits 0 - 2
If the frequency inverter was enabled at the terminals, it can be controlled with bits 0 - 2
for applications with speed feedback of the basic control block.
Control command
"controller inhibit"
You can disable the power output stages of the frequency inverter and set them to high
impedance using the control command
controller inhibit
. At the same time, the fre-
quency inverter activates the mechanical motor brake so that the drive will immediately
come to a standstill through mechanical braking. Motors without mechanical brake will
coast to standstill when using this control command.
You can activate the "
controller inhibit
" control command by setting
bit 0
:
Controller in-
hibit/enable
in the control word because all other bits are not relevant. This setting will
assign the highest priority to this control bit in the control word.
Control command
"rapid stop"
Using the
rapid stop
control command lets you have the frequency inverter brake the
motor at the currently applicable rapid stop ramp. The following rapid stop ramps set via
parameters basically take effect:
• P136 T13 stop ramp (with active parameter set 1)
• P146 T23 stop ramp (with active parameter set 2)
The process ramp that may have been set via fieldbus does not affect the rapid stop.
This control command is activated by resetting
bit 1
:
Enable/rapid stop
.
Bit 2: Enable/stop
Bit 1: Enable / rapid stop
Bit 0: Controller inhibit/enable
Priority
Control com-
mand:
Bit 2
Bit 1
Bit 0
High
.
Controller
inhibit:
X
X
1
e.g. B. 01
hex
, 03
hex
,
05
hex
, 07
hex
,
.
.
Rapid stop:
X
0
0
e.g. 00
hex
, 04
hex
.
.
Stop:
0
1
0
e.g. 02
hex
.
Low
.
Enable:
1
1
0
06
hex
X = irrelevant
00
I
Summary of Contents for Movitrac B
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