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External Seal Probe Connections
7.14. SINGLE PHASE PUMP START-UP PROCEDURE
Run Capacitor sizing can vary depending on the incoming supply voltage provided. HOMA Single Phase pumps
are provided with Start and Run Capacitor(s) sized for 220-230V under load. Frequently, the available line voltage
is considerable different than indicated, and the Run capacitor(s) may need to be resized to match the available
field voltage. The following procedure will allow you to verify proper operation of your single phase pump, and/or
make necessary changes to you capacitors to correct for your power supply.
After verifying wiring is in accordance with your pump requirements, start pump and record the following readings
from each of the (3) pump cable leads.
Current under load:
U1
Should be (highest reading)
Lead U1 (common) should have the highest current reading. Lead Z2 (start) should have the lowest reading.
If Z2 current draw is greater than the current draw of either U1 or U2, a smaller size Run capacitor (lower
microfarad rating) is required to correct the condition. Example: If a 60 µf Run capacitor was supplied, change to a
50 µf Run capacitor and check current readings. Typically, only one step down in capacitor size is required, but in
certain instances 2 steps may be required.
( ) The standard capacitor kit provided includes:
( ) Additional run capacitors have been included for use in tuning the pump to match available line voltages for
optimum performance.
This form is provided for your use in optimizing the performance and service life of your single phase pumps, and
is applicable to most Capacitor Start/Capacitor Run motors. Please contact our customer service with any
questions or if you require any additional information or assistance.
Amps,> U2
(middle reading)
____________µf start capacitor
____________µf run capacitor.
___________µf run capacitor
___________µf run capacitor
___________µf run capacitor
Amps,> Z2
(lowest reading)
Amps
59
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