Delta Electronics VFD-M Series, User Manual

Page: 119 / 173

Chapter 4 Parameters
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4-84 Revision May 2008, ME14, SW V3.04
Pr. 152
Skip Frequency Width
Settings 0.00 to 400.00Hz Factory Setting: 0.00
Pr. 153
Bias Frequency Width
Settings 0.00 to 400.00Hz Factory Setting: 0.00
Frequency of
Δ
top point Fup= master frequency F + Pr.152 + Pr.153.
Frequency of
Δ
down point Fdown= master frequency F – Pr.152 – Pr.153.
Fup
Fdown
Pr.10, 12
Pr.11, 13
Pr.152
Master
Frequency
(F)
Double Pr. 153
Pr. 154
Reserved
Pr.155
Compensation Coefficient for Motor Instability
Factory Setting: 0.0
Settings 0.1 to 5.0 (recommended setting 2.0)
0.0 Disable
This parameter is used to improve a condition of unstable current in any specific area. For
higher frequencies, you can adjust this parameter to 0.0, and increase the setting value in
Pr.155 for 30HP and above (a setting of 2.0 is recommended).
Pr.156
Communication Response Delay Time
Settings 0 to 200 (x500µs) Factory Setting: 0
This parameter is used to set communication response delay time. If you set Pr. 156 to 1 the
communication response delay time will be 1 X 500µs=500µs, set Pr. 156 to 2 the
communication response delay time will be 2 X 500µs=1000µs.
Pr.157
Communication Mode Selection
Factory Setting: 1
Settings 0 Delta ASCII
1 MODBUS