NORD Drivesystems BU0020 - Manual (Page 75)

7 Data transmission
BU 0020 GB-2612 75
7.3.3 Control word (STW)
The control word (STW) is the first word transferred to the frequency inverter in the process data area
in an order telegram. For example, a control word "Ready for switch-on" corresponds to 047E
(hex)
. In
general the command "Standby" should be the first command which is transferred to the inverter.
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7 0 No acknowledgement With the switch from 0 to 1, errors which are no longer active are acknowledged.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: If a digital input has been programmed for the "ack.fault" function, this bit
must not permanently be set to 1 via the bus (otherwise, flank evaluation would
be prevented).
8 0
1 Bit 8 active Bus bit 8 from the control word is set. Only for SK 2xxE and SK 5xxE. For further
details of the function please refer to parameter P480.
9 0
1 Bit 9 active Bus bit 9 from the control word is set. Only for SK 2xxE and SK 5xxE. For further
details of the function please refer to parameter P480.
10 0 PZD invalid The transmitted process data is invalid.
1 PZD valid Valid process data is transferred from the master.
Note: In order for the transmitted setpoint to be valid, this bit must also be set
(setting: interface), even if only setpoint values are transmitted via the bus.
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
Pos: 129 /Anleitungen/Bussysteme/6. Datenübertragung/Zustandswort (ZSW) @ 1\mod_1336386086317_388.docx @ 25495 @ 3 @ 1
7.3.4 Status word (ZSW)
In the inverter response telegram, in the area of the process data the status word (ZSW) is transferred
as the first word. The meaning of the individual bits deviate for some types of devices.