244 YASKAWA TM.iQp.07 iQpump Controller Programming Manual
P9-08 = 2: Feedback + Output Frequency:
This mode monitors both the feedback level and the output frequency to determine if staging is needed. When the output frequency rises
above the P9-09 level and the delta feedback (setpoint - feedback) has exceeded the level set in P9-10 for the time set in P9-11, the lead
drive will issue a network stage request if there is a drive available to run. Refer to Figure 186.
De-staging:
P9-12 = 0: Output Frequency:
This mode monitors the lead drive output frequency and determines if de-staging is needed to maintain the setpoint. If the output
frequency of the lead drive drops below the P9-13 level for the time set in P9-15, then a de-stage request is issued if this is not the only
drive running. Refer to Figure 187.
P9-12 = 1: Feedback Level:
This mode monitors the feedback level and determines if de-staging is needed. If the difference in feedback and setpoint (feedback -
setpoint) has exceeded the P9-14 level for the time set in P9-15, then a de-stage request is issued if this is not the only drive running.
Refer to Figure 188.
P9-12 = 2: Feedback + Output Frequency:
This mode monitors both the feedback level and the output frequency to determine if de-staging is needed. the output frequency of the
lead drive drops below the P9-13 level and the delta feedback (feedback - setpoint) has exceeded the P9-14 level for the time set in P9-15,
then a de-stage request is issued if this is not the only drive running. Refer to Figure 189.
Quick De-stage (P9-18 x P1-09 < PI Feedback):
If the feedback level goes above P9-18 (set as a percentage of P1-09) for 2 seconds, a de-stage request is issued if this is not the only drive
running. Refer to Figure 190.
If Stabilize Time P9-16 > 0, then whenever a pump becomes a lag drive, or gets de-staged that disables lead-lag control and pump
protection. It will resume these functions when the timer P9-16 expires, which counts only when the drive becomes a lead drive once
again.
Setpoint Modifier P9-17 is used to increase or decrease the setpoint each time an additional pump is brought online to compensate for
system losses or gains. The drive's setpoint is modified using this calculation:
Pump X: Setpoint + ((X-1)(P9-17))
Thus, if there is only one pump running, the setpoint is not modified.
Monitor U1-62 is only available when P1-01 = 3. The monitor displays the drive’s network run queue number. The first drive to run will
show U1-62 = 1, the second drive U1-62 = 2 and so on.
When P1-01 = 3 (MEMOBUS / Modbus Network), the U1-01 Display text will change depending on the Auto Mode run command and
the network run command as can be seen in Table 117 on page 245.
(522 pages)
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