2 the status machine – NORD Drivesystems BU0220 User Manual
Page 66
PROFIBUS DP
– Supplementary manualfor NORD Frequency Inverter SK 2xxE
66
Subject to technical amendments
BU 0220 GB-0912
7.2.2
The 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 frequency 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.
The following bits indicate the status of the frequency inverter:
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