5.4 d: Reference Settings
YASKAWA ELECTRIC
SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
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d2: Frequency Upper/Lower Limits
By entering upper or lower frequency limits, the drive programmer can prevent operation of the drive above or below
levels that may cause resonance and or equipment damage.
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d2-01: Frequency Reference Upper Limit
Sets the upper limit for the frequency reference value that is input from frequency reference source 1 (b1-01). The limit
applies to any source selected in parameter b1-01. The value is set as a percentage of the maximum output frequency.
Even if the frequency reference is set to a higher value, the drive internal frequency reference will not exceed this value.
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d2-02: Frequency Reference Lower Limit
Sets the lower limit for the frequency reference value that is input from frequency reference source 1 (b1-01). The limit
applies to any source selected in parameter b1-01. The value is set as a percentage of the maximum output frequency.
If a lower reference than this value is input, the drive will run at the d2-02 level. If the drive is started with a lower
reference than d2-02, it will accelerate up to d2-02.
Figure 5.31
Figure 5.31 Frequency Reference: Upper and Lower Limits
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d2-03: Master Speed Reference Lower Limit
Unlike frequency reference lower limit (d2-02 and d2-05) which will affect the frequency reference no matter where it is
sourced from (i.e., analog input, preset speed, Jog speed, etc.), the master speed lower limit (d2-03) sets a lower limit that
will only affect the analog input (terminals A1 and A2) that is the active master speed frequency.
Set as a percentage of the maximum output frequency.
Note:
The lower limits for the Jog frequency, multi-step speed settings, and 2-step speed settings do not change. When lower limits are
set to both the frequency reference (d2-02 and d2-05) and the main frequency reference (d2-03), the drive uses the greater of
those two values as the lower limit.
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d2-04: Frequency Reference 2 Upper Limit
Sets the upper limit for the frequency reference value that is input from frequency reference source 2 (b1-15). The limit
applies to any source selected in parameter b1-15. The value is set as a percentage of the maximum output frequency.
Even if the frequency reference is set to a higher value, the drive internal frequency reference will not exceed this value.
No.
Parameter Name
Setting Range
Default
d2-01
Frequency Reference Upper Limit
0.0 to 110.0%
100.0%
No.
Parameter Name
Setting Range
Default
d2-02
Frequency Reference Lower Limit
0.0 to 110.0%
0.0%
No.
Parameter Name
Setting Range
Default
d2-03
Master Speed Reference Lower Limit
0.0 to 110.0%
0.0%
No.
Parameter Name
Setting Range
Default
d2-04
Frequency Reference 2 Upper Limit
0.0 to 110.0%
100.0%
Internal frequency
reference
d2-01
Operating
range
Frequency Reference Upper Limit
Set frequency reference
Frequency Reference Lower Limit
d2-02
