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SECTION 5: XE Series 4” Submersible Motors
5.8 4” Motor Overload Protection
Single Phase Motors
Single phase motors have overload protection either
in the motor or in the control box. Motors less than or
equal to 1HP have built-in protection. This automatic
protection will continue to cycle under a locked or stalled
rotorcondition.
Single phase motors larger than 1 HP use overload
protection located in the SMC (Submersible Motor
Controls) section. These are manual overloads and must
be manually reset if an overload condition occurs.
5.9 Motor Cooling
Pentek
®
4” XE Series motors are designed to operate to a
maximum SF (Service Factor) horsepower in water up to
86° F (30° C).
4” motors: Minimum cooling water flow 3 HP and over
I.D of casing Flow GPM (LPM) required
4 1.2 (4.5
5 7 (26.5)
6 13 (49)
7 20 (76)
8 30 (114)
10 50 (189)
12 80 (303)
14 110 (416)
16 150 (568)
If the flow is less than specified, a flow-inducer sleeve
can be installed, as shown in Figure 5-2. The sleeve will
act like a smaller casing size to force flow around the
motor to aidcooling.
5.10 Starting Frequency
Recommended motor starting frequency is shown
below. Motor, pressure switch, tank, and pump life may
be extended by limiting starts per hour and starts per
day. Proper tank sizing is critical to control pump cycle
times. Excessive or rapid cycling creates heat which can
prematurely damage motors, switches, andcontrols.
Motor Starting Frequency
HP
Single Phase Three Phase
Starts/hr Starts/24hr Starts/hr Starts/24hr
1/2 thru 3/4 12.5 300
12.5 300
1 thru 5 4.2 100
7.5 thru 200 4.2 100
A one (1) minute minimum run time for pumps and motors up to 1.5HP and
two (2) minutes for 2HP and larger motors is recommended to dissipate heat
build-up from starting current.
Figure 5-2: Flow Inducer Sleeve
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