AIM Manual

Motor Application » Three-Phase Motors (Page 32)

SubMonitor

SubMonitor Three-Phase Protection

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.

This product is lead free.

Protects Against

Under/Overload
Under/Overvoltage
Current Unbalance
Overheated Motor (if equipped 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. Table 32 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 PF OF
HP	KW	0.9	0.95	1
5	3.7	1.2	2.1	4
7.5	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	12
25	18.5	2.1	6.2	15
30	22	2.5	7.4	18
40	30	4.5	11	24
50	37	7.1	15	32
60	45	8.4	18	38
75	55	6.3	18	43
100	75	11	27	60
125	93	17	36	77
150	110	20	42	90
175	130	9.6	36	93
200	150	16	46	110

Values listed are total required (not per phase).