34 PCP/ESP program features
Timing diagram
At start, the pump starting speed function controls the pump to run in the start
acceleration time. After a defined delay time is passed, the function releases control
and the pumps shifts to normal acceleration time to reach the reference speed.
Settings
Parameters: 74.12 Starting speed enable, 74.13 Starting speed, 74.14 Starting speed
acc time and 74.15 Starting speed time delay.
Signals: 09.06 Motor speed reference and 09.14 Pump status word (Bit 14)
Warnings: -
Faults: -
Pump level control
The pump level control is a fluid level PI regulator for maintaining fluid level at a
certain set point. The pump speed is adjusted based on the requirements during the
working process. The actual fluid level value comes through a dedicated input, that
reads the signal from one or several sensors. The fluid level is maintained through
continuous speed adjustment in PI regulator. The user can enable this function in the
parameter 75.01 Level control enable.
Note: The pump level control provides fluid level data even if the level control is
disabled. It is also possible to check the fluid level through pressure data, since the
values are in direct relation.
Timing diagram
Non-inverted level control
When feedback from fluid level source is higher than fluid level set point, the PI
regulator output decreases, causing the speed reference to decrease. The grey
Time
Reference speed
Start
acceleration
time (Par74.14)
Wait time
(Par 74.15)
Normal
ramp time
(Par 74.10)
Start up reference
(Par 74.13)
Reference
speed ramped
(Par 09.06)
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