4" Motor Overload Protection; Motor Cooling; Starting Frequency - Pentair Pentek Series Electronic Manual

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 1 HP have built-in protection. This automatic
protection will continue to cycle under a locked or stalled
rotor condition.
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
4
5
6
7
8
10
12
14
16
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 aid cooling.

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, and controls.
Motor Starting Frequency
Single Phase
HP
Starts/hr Starts/24hr
1/2 thru 3/4 12.5
1 thru 5 4.2
7.5 thru 200
A one (1) minute minimum run time for pumps and motors up to 1.5 HP and
two (2) minutes for 2HP and larger motors is recommended to dissipate heat
build-up from starting current.
24
Flow GPM (LPM) required
1.2 (4.5
7 (26.5)
13 (49)
20 (76)
30 (114)
50 (189)
80 (303)
110 (416)
150 (568)
Three Phase
Starts/hr Starts/24hr
300
12.5 300
100
4.2 100
Figure 5-2: Flow Inducer Sleeve