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Application – Three-Phase Motors
Applications
SubMonitor is designed to protect 3-phase pumps/
motors with service factor amp ratings (SFA) from 5
to 350 A (approx. 3 to 200 hp). Current, voltage, and
motor temperature are monitored using all three legs
and allows the user to set up the SubMonitor quickly
and easily.
Protects Against
• Under/Overload
• Under/Overvoltage
• Current Unbalance
• Overheated Motor
(if equipped with Subtrol Heat Sensor)
• False Start (Chattering)
• Phase Reversal
In some installations, power supply limitations make it
necessary or desirable to increase the power factor of a
submersible motor. The table lists the capacitive kVAR
required to increase the power factor of large Franklin
three-phase submersible motors to the approximate
values shown at maximum input loading.
Capacitors must be connected on the line side of the
overload relay, or overload protection will be lost.
Values listed are total required (not per phase).
Table 31 kVAR Required 60 Hz
MOTOR KVAR REQUIRED FOR PF OF:
HP KW 0.90 0.95 1.00
5 3.7
1.2 2.1 4.0
7.5 5.5
1.7 3.1 6.0
10 7.5
1.5 3.3 7.0
15 11
2.2 4.7 10.0
20 15
1.7 5.0 12.0
25 18.5
2.1 6.2 15.0
30 22
2.5 7.4 18.0
40 30
4.5 11.0 24.0
50 37
7.1 15.0 32.0
60 45
8.4 18.0 38.0
75 55
6.3 18.0 43.0
100 75
11.0 27.0 60.0
125 90
17.0 36.0 77.0
150 110
20.0 42.0 90.0
175 130
9.6 36.0 93.0
200 150
16.0 46.0 110.0
SubMonitor Three-Phase Protection
Power Factor Correction
31