Insulation And Winding Resistance Tests; Advanced Settings / Options - Xylem 3AB2 Manual De Instrucciones

• Typical UIB Settings:
• 30 or 10 Hertz (depends on pump/motor)
• Dry Run Restart - 5X
• Low Pressure Cut-Off - On (switch to off if pressure
drops by 20 PSI or more)
• Pressure Drop - 5 PSI
• Transducer - Connected
• Transducer Jumper - Bottom Position (Factory Setting)
• Float Switch Connected to Switch Input
Transducer Jumper
Explosion Hazard. Keep jumper in bottom
DANGER
position whenever a pressure transducer is
used. Failure to do so may cause a pressure transducer error
to be ignored and an over-pressure hazard to result.
For applications not requiring a pressure transducer such
as level control, the transducer can be removed. When
the transducer is not used, the Transducer Jumper must be
placed in the top position to prevent a sensor error. Never
place the jumper in the top position when using a pressure
transducer.
5: INSULATION AND WINDING 5: INSULATION AND WINDING
RESISTANCE TESTS
RESISTANCE TESTS
INSULATION RESISTANCE
Electrocution Hazard. Turn off power and
DANGER
wait 5 minutes before opening cover.
1. Set the scale lever to R x 100K and adjust to 0.
2. Disconnect motor leads from the controller (note
position of wires). Connect an ohmmeter lead to any one
of the motor leads and the other ohmmeter lead to the
ground wire on the motor or the ground terminal in the
motor conduit box.
Normal Ohm and Megohm Values (Insulation
Resistance) Between All Leads and Ground
Insulation resistance does not vary with rating. All motors of all HP , voltage and phase
rating have similar values of insulation resistance.
Condition of Motor and Leads
A new motor (without cable).
A used motor which can be reinstalled.
Insulation damage, locate and repair
What it Means
1. If the ohm value is normal, the motor windings are not grounded
and the cable insulation is not damaged.
2. If the ohm value is below normal, either the windings are grounded or
the cable insulation is damaged. Check the cable at the well seal as the
insulation is sometimes damaged by being pinched.
MOTOR WINDING RESISTANCE CHECKOUT
1. Set the scale lever to R x 1 for values under 10 ohms. For values
over 10 ohms, set the scale lever to R x 10. Zero balance the
ohmmeter.
Electrocution Hazard. Turn off power and
DANGER
wait 5 minutes before opening cover.
Ohms Megohm
Value Value
20,000,000 20.0
(or more) (or more)
10,000,000 10.0
(or more) (or more)
Less than Less than
500,000 .50
2. Connect the ohmmeter leads as shown below.
Cable Resistance – Copper
If aluminum cable is used the readings
Paired Wire
Size
will be higher. Divide the ohm readings
Resistance
Cable
on this chart by 0.61 to determine the
(ohms per foot)
actual resistance of aluminum cable.
14 .0050
12 .0032
Ground
10 .0020
Wire
8 .0013
6 .0008
4 .0005
2 .0003
0 .0002
00 .00015
000 .00013
0000 .00010
See motor data pages for motor resistance ratings.
What it Means
1. If all ohm values are normal, the motor windings are neither shorted
nor open, and the cable colors are correct.
2. If any one ohm value is less than normal, the motor is shorted.
3. If any one ohm value is greater than normal, the winding or the cable is
open or there is a poor cable joint or connection.
4. If some ohm values are greater than normal and some less and the
motor is single phase with red, black and yellow wires, then the leads
are mixed.

6: ADVANCED SETTINGS / OPTIONS

6: ADVANCED SETTINGS / OPTIONS
WHEN TO USE ADVANCED SETTINGS
• Failure of the controller to go into standby mode (pump
stopped) is sometimes caused by the tank or check valve.
First insure that the tank pre-charge pressure is correct,
refer to Tank Sizing and Setting section. The system
must be drained to properly check the tank pre-charge
pressure. A faulty check valve or system leak will allow
a system pressure drop preventing the controller from
shutting down as it will see flow. Spring type check valves
should be used for every 200' of vertical pipe and one on
the pump side of the tank and pressure sensor. If the tank
and check valve appear to be operating correctly, use the
instructions and chart in Size of Pressure Variation for
Flow Detection in this section to make a program change.
• If the controller stops momentarily when there is plenty
of flow - see instructions to increase pressure variation in
Size of Pressure Variation for Flow Detection.
• If a No Water/Loss of Prime fault (2 red blinks) is not
detected when the well is dry, first ensure the motor
overload setting is correct. Then perform the No Water/
Loss of Prime Power Calibration while the system is at
maximum flow (open several faucets) and the pressure
setting is normal. It may be necessary to change the No
Water/Loss of Prime Trigger Conditions to Power Only or
Pressure Only.
• If the No Water/Loss of Prime fault (2 red blinks) occurs
when there is plenty of water available, perform the No
Water/Loss of Prime Power Calibration while there is low
flow and the pressure setting is high.
• If a No Water/Loss of Prime is impossible e.g. pumping
from a lake, it can be disabled.
Most applications do not require changes to these advanced
settings. They are provided for the occasional application
that requires more flexibility to achieve desired results.
O H M S
Z E R O
O H M S
R X 1 0 0 R X 1 0 0 0
R X 1 0 R X 1 0 K
R X 1 R X 1 0 0 K
Motor
Leads
RX1
or
RX10
9