The
Enable Controller Status Bit
Bit 0 of the status word is determined from the combination of the input terminals and the control
command contained in the control word. Fig. 20 shows the reaction of the
Controller Enable status
bit as a function of the
Enable control command and the actual speed respectively.
The
Ready for Operation Signal
When status bit 1 in the status word signals
Ready for Operation = 1, then the inverter is ready to
respond to control commands from an external control system. The inverter is not ready to respond,
if
- the MOVITRAC
®
31.. signals a fault
- the factory setting is ongoing (set-up)
- no mains voltage is present.
The
Fieldbus Mode Active Signal
Status bit 2 signals whether the inverter is in the FIELDBUS control mode (
P841 Control Mode =
FIELDBUS) and responds to control commands/setpoints from the process data channel of the
fieldbus interface.
Adjustment of the inverter parameters via the fieldbus interface is possible at any time independent
of the set control mode.
Current Parameter Set/Ramp Generator (not for MOVITRAC
®
31.., size 0)
Bits 3 and 4 of the status word indicate the currently selected parameter set and ramp generator.
Fault/Warning
In bit 5 of the status word the inverter signals a fault that may have occurred or issues a warning.
When a fault is signalled, the inverter is no longer ready for operation, whereas a warning may occur
temporarily without affecting the operational performance of the inverter. For exact filtering of a fault
we therefore recommend to evaluate status bit 1:
Ready for Operation in addition to this fault bit
(prerequisite: mains voltage ON). For the coding of a fault or warning see the following table.
0
0
1
0
1
t
n
setp.
Status bit 0:
Controller enabled
Speed
characteristic
Control command
Enable
00330AEN
Fig. 20: Behaviour of status bit 0:Controller Enabled
Inverter Control
with Process Data
3
34
MOVITRAC
®
31.. Fieldbus Unit Profile
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
