Yaskawa iQpump Controller User Manual - Manual (Page 248)

248 YASKAWA TM.iQp.06 iQpump Controller User Manual
G.6 Start Level Function
G.6 Start Level Function
The following is a summary of a set-up procedure and application examples included in this section.
• Start Level Function
With the Start Level function, the system starts when the feedback level drops below the start level for the time specified in P1-05. This
level also specifies the wake up level when the iQpump drive is in Sleep Mode. If this is set to a negative value, the feedback level must
drop this amount below the setpoint.
When parameter P1-04 is set to a positive value, the feedback must drop below that value before the drive will wake up. When parameter
P1-04 is set to a negative value, the feedback must drop the P1-04 amount below the setpoint.
Figure G.3
Figure G.5 Start Pump System
In Figure G.5 above, the system setpoint U1-01 = 100 psi and start level P1-04 = 70 psi and the iQpump drive would allow for a 30 psi
pressure draw down before starting. If the setpoint U1-01 is increased to 110 psi, the new draw down pressure is equal to 40 psi (110 psi
- 70 psi = 30 psi).
If maintenance of a 30 psi draw down pressure is required, the P1-04 setting would need to increase to 80 psi (110 psi - 80 psi = 30 psi).
Figure G.4
Figure G.6 70 psi
Figure G.6 shows 70 psi Start level for a 30 psi draw down with a setpoint U1-01 = 100 psi.
Figure G.5
Figure G.7 80 psi
Figure G.7 shows 80 psi Start level for a 30 psi draw down with a setpoint U1-01 = 110 psi.
-ADV-
Start Level
-- - - - - - - - - - - - - - - - -
P1-04=0070.0PSI
(-999.9-999.9)
-ADV-
Start Level
-- - - - - - - - - - - - - - - - -
P1-04=0080.0PSI
(-999.9-999.9)