Application Limits - Pentair PENTEK 76PM2-50-4 Owner's Manual

Safety

APPLICATION LIMITS

Maximum Immersion Depth: 656 ft. (200 m)
Maximum Water Temperature: 95°F (35°C)
pH content of the water: 6.5–8
Minimum Water Flow Rate: See chart.
Required line voltage at the motor under operating
conditions (±10%).
NOTICE When calculating voltage at the motor, be sure to
allow for voltage drop in the cable.
The sum of the absolute values of the voltage and frequency
must not vary from the sum of the nominal values by more
than ±10%.
Operating with current unbalanced on the three legs of the
circuit can overheat and damage the motor and will void the
warranty. Current imbalance must not exceed 5% maximum.
Maximum Sand Content: 50ppm (max. size 0.1–0.25mm)
Maximum Chlorine Ion Content: 5000ppm
Problem
Motor does not start, but does not blow
fuses or trip circuit breaker
Motor starts, but fuses blow or circuit
breakers trip
Motor starts and runs, then blows fuse
or trips circuit breaker
Motor does not start, but fuse blows or
circuit breaker trips
Water Flow Rate
Motor Type
Possible Causes
Defective fuses or circuit breakers
Loose or corroded terminals
Damaged or defective connections
No incoming power
Wrong voltage
Incorrect fuses or relay
Incorrect connections
Locked rotor or pump
Insufficient insulation on motor cables
Incoming voltage more than 10% high
or low
Sand in well
locked rotor or pump
HP / KW
7" 50-60 HP / 37-45 KW
8" 40-75 HP / 30-55 KW
8" 100-125 HP / 75-92 KW
10" 150-250 HP / 147-185 KW
Solution
Replace fuses or circuit breakers. Clean
and tighten connections and motor lead
terminals.
Repair or replace connections.
Contact power company.
Make sure that nameplate rated voltage
matches nominal power supply, and
that actual supply voltage is within
±10% of nameplate voltage.
Install correct fuses or relay.
Re-connect motor wires correctly.
Make sure that motor is at least 10ft
above bottom of well, check well for
sand.
Install new motor cables; recheck resis-
tance with Megohmeter.
Confirm high or low voltage in motor
cable, consult power company.
Pull the pump and clean the well.
Check for sand in well.
Make sure that motor is at least 10ft
above the bottom of the well.
Pull pump and check for mechanical
obstruction in the pump and for free
rotation of the motor.
4
Minimum Water
Flow Rate (m/s)
0.2
0.2
0.5
0.5