Motor Inspection; Testing - Pentair Pentek Series Electronic Manual

SECTION 7: Hitachi

7.1 Motor Inspection

The following conditions are stated to provide the owner
with a list of criteria for maximum motor life and to
assure motor warranty.
1. Maximum water temperature:
• A) 35°C (95°F): 6" (5~40HP) motors.
• B) 25°C (77°F): 6" (50,60HP), 8'', 10", 12'' and 14"
motors
2. PH content of the water between: 6.5 -8
3. Maximum chlorine content: 500 PPM
• Maximum Sulfuric acid iron content: 15 PPM
• Maximum Fluorine content: 0.8 PPM
• Maximum Electric conductivity: 118 μMHO/INCH
4. Maximum sand content: 50 PPM
5. Proper approved three phase overload protection.
See Table 13.
6. Proper fusing for motor circuit protection.
See Table C.
7. Proper line voltage during running conditions:
60Hz: 460V, 230V ±10%
50Hz: 380V ±10%
at motor lead terminal. (Voltage drop of cable should
be considered by user.)
Combination of voltage and frequency variation:
±10% (sum of absolute values of voltage and
frequency)
Current unbalance between legs should not exceed
5% of the average.
8. Proper sizing of motor (current, thrust, voltage, etc.)
and a 10 feet clearance from the bottom of the well
are required.
9. In the case of horizontal installation, the motor is to
be rigidly aligned with the pump and firmly mounted
to prevent any load on the shaft and bearings and to
avoid any damaging vibrations to the motor.
10. The motor must always be immersed in water so that
a flow velocity of cooling water at a rate of 0.5 feet
per second flows past any and all parts of the motor.
The motor will not operate in mud or sand.
11. The power cables shall be sized large enough so
that at rated current there will be less than a 5%
voltage drop. See Table C. Cables must be waterproof
submersible type.
12. For 3ø motor a balanced and properly sized
transformer bank shall be provided. Improper
electrical supply (for example, phase converter.
V-connection transformer, etc.) or connections will
void the warranty
13. Single-phase protection is recommended for
protection of the installation. Any failure due to single
phasing of the incoming voltage causing the motor to
fail will void the warranty.
Hitachi is a registered trademark of Hitachi Industrial Equipment Systems Co., Ltd.
®
34
6" and Larger Submersible Motors
®
14. Surge suppressors are recommended in the interest
of protecting the control panel, as well a.s the
insulation system of the motor. Any motor failure
due to lightning or other Acts of God will void the
warranty.
15. Provide waterproof insulation splices between all
lead wires and well cables.
16. In the event that a reduced voltage starter is used to
start the motor, the following should be verified:
• Correct quick trip, class 10 or better, ambient
compensated overloads are incorporated.
• Proper short circuit protection is utilized.
• The torque required by the motor and pump package
is attainable by this type starter.
• The lead arrangement of the motor is acceptable with
the proposed starter load connections.
• Verify that if any time delay relays are used in
switching contactors in and out, that the time settings
do not exceed 2 seconds; this could damage the
motor.
• lf a manual auto transformer starter is used, voltage
should be minimum 60% of rated voltage, and
switched to "Run"condition within 2 seconds. Double
check Table B and C for correct protection.
17. Single-Phase Motors (5-15HP)
Proper connections and correct capacitors and
relays are necessary for single-phase motor starting
and running. Connection diagram: Sec Fig. 1.
Performance and recommendable capacitors: See
Table D.

7.2 Testing

1. Do not use lead wires to pull, lift or handle the motor.
The lead wires should be protected during storage,
handling, moving and installation of the motor. 2)
2. Inspect the motor to determine that it is the correct
HP, voltage and size for the job and that there is no
shipping damage.
3. The factory-installed water in the motor is supplied
with anti-freeze capable of temperatures to
0°C(-22°F). Do not install, transport or store below
these temperatures. If storage is necessary below
these temperatures, drain the water from the motor.
4. After long periods of idleness and on all new
installations, check the electrical resistance and
megger the motor with lead wires connected: see
table A. Prior to installation, the motor should have
an insulation value of at least 50 megohms. After
installation, motor and power cable should have a
minimum insulation value of 1 megohm. If minimum
values are not obtained, contact factory.