Publication 2092-UM001D-EN-P — July 2005
Ultra1500 Application Examples 5-45
Dual Current Command Mode
Figure 5.26 shows the block diagram for the dual current mode of the
Ultra1500:
Figure 5.26
Dual Current Mode Block Diagram
In this operating mode, an external controller performs all commutation
functions, and the Ultra1500 drive functions as a simple three-phase current
regulator.
• If the command polarity is set to Normal, the U phase current command
comes from the analog velocity input and the W phase current command
comes from the analog current input.
• If the command polarity is set to Inverted, the U phase current command
comes from the analog current input and the W phase current command
comes from the analog velocity input.
The current command limit is set to the minimum of the following:
• Positive / Negative Internal Current Limit,
• Positive / Negative External Current Limit,
• Stopping Current (if active), and
• Drive Peak / Motor Peak Current Rating.
Block/Switch definitions shown in Figure 5.26 refer to the Ultraware parameter names where applicable.
+
+
Analog Velocity
Command (Volts)
K
c
Analog Velocity
Command
Offset (V olts)
3
Block/Switch Definitions:
1 Mode Configuration : Analog : Velocity Command Offset
2 Mode Configuration : Analog : Current Command Offset
3 Mode Configuration : Analog : Current Scale
4 Main Drive Window : Command Polarity
5 Main Drive Window : Current Limits; Main Drive Window : Stopping Functions : Maximum Stopping Current
5
UVW Phase Current
Command to
Current Regulator
Phase Current
Cmd Amplitude
Limit
1
+
+
Analog Current
Command (Volts)
K
c
Analog Current
Command
Offset (Volts)
3
2
4
4
U Phase
Current
Command
W Phase
Current
Command
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