NORD Drivesystems BU0220 User Manual
Page 61
BU 0220 GB-0912
Subject to technical amendments
61
7.2.1.1 Control word (STW)
The control word (STW) is the first word transferred to the frequency inverter in the process data section in an
order telegram. For example, a control word "Ready for switch-on" corresponds to 047E
(hex)
. The FI is
ultimately enabled with 047F
(hex)
.
PZD1
PZD2
PZD3
PZD4
STW
SW1
SW2/3
SW2/3
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Meaning of the individual bits:
Bit
Value
Meaning
Remarks
0
0
OFF 1
Reverse with the brake ramp, with disconnection from supply at f=0Hz
1
ON
Ready for operation
1
0
OFF 2
Cut off voltage; the inverter output voltage is switched off; the FI enters a state
where switching on is disabled.
1
Operating condition
OFF 2 is cancelled
2
0
OFF 3
Quick stop with programmed quick stop time; with disconnection from supply at
f=0Hz; the FI switches to starting disabled condition.
1
Operating condition
OFF 3 is cancelled
3
0
Disable operation
Cut off voltage; the inverter output voltage is switched off; the FI enters a state
where switching on is enabled.
1
Enable operation
The output voltage is enabled; ramp to the existing setpoint
4
0
Lock ramp generator
Ramp generator is set to zero; no disconnection from supply at f=0Hz; FI remains
in the operation enabled state.
1
Operating condition
Enable ramp generator
5
0
Stop ramp generator
The setpoint currently provided by the ramp generator is "frozen" (frequency is
maintained).
1
Enable ramp generator Enable setpoint on ramp generator
6
0
Disable setpoint
Selected setpoint value is set to zero on the ramp generator.
1
Enable setpoint
Selected ramp generator setpoint is activated.
7
0
No acknowledgement
With the switch from 0 to 1, errors which are no longer active are acknowledged.
1
Acknowledge
Note: When a digital input has been programmed for the "ack.fault" function, this
bit must not permanently be set to 1 via the bus (otherwise, edge evaluation
would be prevented).
8
0
1
Bit 8 active
Bus bit 8 from the control word is set. (only for SK 200E and SK 500E)
For further details of function, please refer to parameter (P480) and Section 7.2.1.7.
9
0
1
Bit 9 active
Bus bit 9 from the control word is set. (only for SK 200E and SK 500E)
For further details of function, please refer to parameter (P480) and Section 7.2.1.7.
10
0
PZD invalid
The transmitted process data is invalid.
1
PZD valid
Valid process data is transferred from the master.
Note: If only setpoints are transferred via the bus, this bit must be set so that the
transferred setpoint is valid.
11
0
1
Rotational direction:
right
Rotational direction right (priority) ON*
12
0
1
Rotational direction:
left
Rotational direction left ON*
13
0/1
Reserved
14
0/1
Bit 0 to switch
parameter set
00 = Parameter set 1
01 = Parameter set 2
10 = Parameter set 3
11 = Parameter set 4
15
0/1
Bit 1 to switch
parameter set
* If Bit 12=0, then "Direction of rotation right ON" applies