Emerson FXMP25 User Manual page 41

• Enter new mode in Pr 78
• Reset
• Power cycle
The new mode will then take effect.
When Mentor II modes [2.H (2) 2.F (3)] are required, Pr 11 must be set before Pr 78.
NOTE
If Pr 11 is changed after Pr 78 = 2.H (2) or 2.F (3), a power cycle is required before the
new values will take effect.
Recommendations
Half control
Normally use half control, since this generally produces a lower amplitude of current
ripple. This results in lower torque ripple in motor.
Full control
Full control causes the SCR bridge to force the field current more rapidly towards zero
at each half cycle. This increases the amplitude of the current ripple, but gives faster
control of the field current level. Use full control under the following conditions:
• When very rapid field weakening is required
• If the natural decay of the field defined by
required, then full field control is required
Pr 78 can be changed while running between St.H (4) and St.F (5).
NOTE
When controlling FXMP with Mentor MP, Mentor MP firmware must be V01.05.01 or
NOTE
later (Pr 11.29 = 01.05, Pr 11.34 = 1).
80
Coding
Range
Update rate
Indicates that field economy level has been selected.
81
Coding
Range
Default
Update rate
Select the destination parameter of the digital input (terminal 1).
If Pr 81 = 0 (Eco), the digital input controls parameter Pr 80. This is inverted so Pr 80 is
'ON' by default.
If Pr 81 = 1 (F.Ctl), the digital input controls the parameter Pr 77.
Reset the drive for the change to take place.
FXMP25 User Guide
Issue Number: 3
Economy level selected
Bit FI Txt
1 1
OFF (0) to On (1)
Background read
Digital input control
Bit FI TE
1
Economy Level (0) or Enable Field Controller (1)
0
Background read
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L
⎛ ⎞
--- -
is slower than the acceleration
⎝ ⎠
R
.
VM DP ND US
1
VM DP ND US
RW BU PS
RW BU PS
1 1 1
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