Water Systems
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SubMonitor Three-Phase Protection

Applications

SubMonitor is designed to protect 3-phase pumps/ motors with service factor amp (SFA) ratings 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 equiped with Subtrol Heat Sensor)
  • False Start (Chattering)
  • Phase Reversal

  
 

Power Factor Correction
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.

 
Table 32  KVAR Required 60 Hz
Motor KVAR Required for P.F. of:
HP KW .90 .95 1.00
5 3.7 1.2 2.1 4
7 1/2 5.5 1.7 3.1 6
10 7.5 1.5 3.3 7
15 11 2.2 4.7 10
20 15 1.7 5.0 12
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 93 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
Values listed are total required (not per phase).