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NORD Drivesystems BU0570 User Manual

Page 21

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4 Communication

BU 0570 GB-0312

Subject to technical amendments

21

4.2.4

FI Status Machine

The frequency inverter passes through a status machine. The changes between various states are triggered
by the respective control commands in the process data control word. The actual status is returned in the
process data status word.
After switching on, the inverter is in switch-on disabled status. This status can only be ended by
transmitting the “Shut down (Off 1)” command.
The answer to a master telegram normally does not yet contain a reaction to the control command. The
controller has to check the answers from the slaves as to whether the control command has been carried
out.

Status

Bit 6

Switch-on

disable

Bit 5

Emergency

stop

Bit 4

Disable

voltage

Bit 3

Fault

Bit 2

Operation

enabled

Bit 1

Standby

Bit 0

Ready for

switch-on

Not ready to start

0

X

X

0

0

0

0

Starting

disabled 1 X X 0 0 0 0

Ready

to

start

0 1 1 0 0 0 1

Activated

0 1 1 0 0 1 1

Operation

enabled

0 1 1 0 1 1 1

Fault

0 X X 1 0 0 0

Error

active

0 X X 1 1 1 1

Emergency stop
active

0 0 1 0 1 1 1

Table 15 Codes for FI status