Yaskawa P7B Drive Bypass - Manual (Page 135)

Programming 5 - 41
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d2 Reference (Speed Command) Limits
" d2-01 Frequency Reference Upper Limit
Setting Range: 0.0 to 110.0%
Factory Default: 100.0%
" d2-02 Frequency Reference Lower Limit
Setting Range: 0.0 to 110.0%
Factory Default: 0.0%
The use of parameters d2-01 and d2-02 places limitations on the speed command that the Drive will accept. The parameters
are set in units of percentage of the maximum frequency (E1-04) and provide limits on any remote speed command input. By
entering upper or lower frequency limits, the Drive programmer can prevent operation of the Drive above or below levels that
may cause resonance, equipment damage or discomfort (see also parameter d3-0X). For example, limits may be needed to
prevent low speed operation of: cooling tower fans with gear boxes, pumps with pressure dependent seals or AHUs with
minimum delivery requirements.
Fig 5.21 Frequency Reference Upper and Lower Limit Effects on the Speed Command
d2-01
d2-02
Frequency Reference Upper Limit
Frequency Reference Lower Limit
Internal Speed Command
Set Speed Command
Note: See also the “Sleep” function in Figure 5.19 for alternate “lower limit” implementation.
d2-01
d2-02
Operating
Range