Fuji Electric FRENIC-AQUA series, User Manual

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6.3 Details of Function Codes
6-231
Chap. 6
FUNCTION C
ODES
J182
J183
J184
J185
J186
End of Curve Protection (Input selection)
(Detection current)
(Deviation)
(Flow sensor)
(Detection timer)
Large-water-volume operation status due to factors such as pump capacity selection mistakes
can be detected. Large-water-volume status is detected, based on output frequencies, output
current, flow sensor values, and PID deviation values.
End of curve protection becomes active when all of the conditions in (1) to (4) are satisfied
and the detection timer (J186) setting time elapses.
< Detection condition >
(1) Output frequency detection
"Output
frequency
≥
upper limiter"
(F03, F15, J1/2-18, E61 to E63 = 13: lowest frequency among upper limit frequencies)
* When in large-water-volume status, the output frequency is kept at the maximum
frequency during operations because the pressure is insufficient (the feedback value
decreases).
(2) Current detection
"Output current > End of curve protection (detection current) (J183)"
* Because large-water-volume operation is being performed, current according to the
maximum load flows.
(3) Deviation detection
"Feedback value (PV) < PID control command value (SV) - deviation (J184)"
* During large-water-volume operation, the feedback value decreases because request of
water supply is beyond assumption.
(4) Flow sensor
"Flow sensor = ON status"
* Because large-water-volume operation is being performed, the flow sensor is turned
ON like normal operations.
As for the conditions in (1) to (4), those with OFF selected are considered as being
satisfied when activation of dry pump protection is judged.
Note, however, that if all the conditions in (2) to (4) are set to OFF, dry pump
protection does not become active even when the condition in (1) is satisfied.
„ End of curve protection (Input selection) (J182)
Set an operation for End of curve protection.
- Data setting range: 0 to 2
Data for J182 Operation description
0 Disable
1 Alarm (inverter stop with PoL trip)
2 Warning output
Operations regarding End of curve protection can be monitored from external
equipment, by assigning L-ALM ("Light alarm") to any of [Y1] to [Y4], [Y5A/C] and
[30A/B/C]. (E20 to E24 and E27, data = 98).