Yaskawa iQpump Controller User Manual - Manual (Page 251)

G.8 Lube Pump Digital Output for Deep Well Irrigation
YASKAWA TM.iQp.06 iQpump Controller User Manual 251
G.8 Lube Pump Digital Output for Deep Well Irrigation
The following is a summary of a set-up procedure and application examples included in this section.
• Lube Pump Digital Output for Deep Well Irrigation example
The iQpump drive uses a programmable internal timer that allows for a normally open digital output to close before the pump starts in
Auto or Hand mode. This activates a solenoid valve and allows water to flow to pre-lube the bearings.
This digital output setting is used in vertical turbine well pumps known as a Lineshaft turbine pumps. Lineshaft turbine pumps have a
motor located on the well head with a line shaft supported by shaft bearings running down the discharge column pipe to the pump. Water-
lubricated line shaft bearings rely on water pumped through the column pipe for cooling and lubrication. When the water table is very
shallow, water in the column pipe reaches the bearing almost immediately. When the water table is deeper, it can take several seconds for
water to reach the uppermost bearings, which will fail prematurely if they are allowed to spin for even a few seconds without lubrication.
This type of installation will normally have some type of pre-lubrication system that allows water to run down the shaft and lubricate the
top bearings before the pump starts. The most common pre-lube systems are from a pressurized header or water storage tank.
Note: Check the voltage and maximum current rating on the digital outputs before wiring to terminals.
◆ Deep Well Irrigation Application Example
A turbine pump requires that a solenoid valve is activated for 15 seconds to pre-lubricate the line shaft bearings before the pump starts.
Digital outputs M1-M2 will close at the start to energize the solenoid and allow water to flow.
Lube Pump: The lube pump function will operate when the iQpump drive is accelerating from zero speed. Instead of starting, the drive
will remain base-blocked at zero speed until the lube pump timer configured by Parameter P4-23 expires. Whenever the lube pump timer
is timing (after a start or restart), the Lube Pump digital output (H2-0x = 55) will be energized. Setting Parameter P4-23 to 0.0 disables
the lube pump feature
◆ Required Parameter Changes
• H2-01 = 55 (Digital Outputs M1-M2)
• P4-23 = 15 s
Note: All other parameters are at factory default settings.
Table G.5 Related Parameters
Table G.6 Added Multi-Function Output Setting
Table G.7 Alarm
Parameter
No.
Addr.
Hex
Parameter Name
Digital Operator Display
Description
Setting
Range
Factory
Setting
Menu
Location
P4-23 836
Lube Pump Delay Timer
Lube Pump Time
Sets the amount of time the drive output will be delayed and the Lube
Pump digital output (H2-0x = 55) will be energized. A setting of 0.0 will
disable this feature
0.0 ~
300.0 s
0.0 Programming
Setting Description V/f
55
Lube Pump
This will energize for the time set in parameter P4-23 each time the drive is supposed to start. The drive will delay
starting for P4-23 time.
¸
Alarm Display Description
Lube Pump Running The drive is delaying the start of the motor and the Lube Pump digital output is energized.