3-12 Programming and Parameters
Basic Program Group (continued)
P038 [Speed Reference] Related Parameter(s): b001, b002, b012, b020, b021, P039,P040,
A051
-A054, A069, A070-A077, A110, A111,
A112
, A113, A123, A132, A140-A147, A150-A157
Sets the source of the speed reference to the drive.
The drive speed command can be obtained from a number of different sources. The source is
normally determined by P038
[Speed Reference]. However, when A051 - A054 [Digital Inx Sel] is set
to option 2, 4, 5, 6, 11, 12, 13, 14, 15 and the digital input is active, or if A132
[PID Ref Sel] is not set
to option 0, the speed reference commanded by P038
[Speed Reference] will be overridden. Refer to
the flowchart on page 1-27
for more information on speed reference control priority.
Options 1 “InternalFreq” Internal frequency command from A069
[Internal Freq]. Must
be set when using MOP function.
2 “0-10V Input” External frequency command from the 0-10V or ±10V analog
input or remote potentiometer.
3 “4-20mA Input” External frequency command from the 4-20mA analog input.
4 “Preset Freq” External frequency command as defined by A070
- A077
[Preset Freq x] when A051
- A054 [Digital Inx Sel] are
programmed as “Preset Frequencies” and the digital inputs
are active.
5 “Comm Port” (Default) External frequency command from the communications port.
Refer to Appendix C for details.
6 “Stp Logic” External frequency command as defined by A070
- A077
[Preset Freq x] and A140
- A147 [Stp Logic x]. If Step
Logic-based positioning control is desired, select option 9
“Positioning” and adjust E222
[Positioning Mode].
7 “Anlg In Mult” External frequency command as defined by the product of the
analog inputs (shown in b020
[Analog In 0-10V] and b021
[Analog In 4-20mA]).
[Analog In 0-10V] × [Analog In 4-20mA] = Speed Command
Example: 100% × 50% = 50%
8 “Encoder” External frequency command directly from encoder or pulse
train input. Use E216
[Motor Fdbk Type] to select encoder
type.
9 “Positioning” External position as defined by E222
and E230 - E245. Refer
to Appendix
F for detailed information on positioning.
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