Product Manual

SQ, SQE introduction
SQ, SQE, CU 331, and SP
1
4
1. SQ, SQE introduction
3-inch SQ, SQE submersible well pumps for 3-inch
and larger wells
SQ, SQE pumps are suitable for both continuous and
intermittent operation for a variety of applications:
• Domestic water supply
• light commercial
• irrigation
• tank applications.
SQ, SQE features and benefits
SQ, SQE pumps offer these features:
• Dry-run protection
• high efficiency pump and motor
• protection against up-thrust
•soft-start
• over-voltage and under-voltage protection
• over-temperature protection
• high starting torque.
Additionally, SQE pumps offer these advantages:
• Constant pressure control
• variable speed
• electronic control and communication.
SQ, SQE innovative motor technology
SQ, SQE pumps feature an innovative motor design
incorporating permanent-magnet technology. By
combining permanent-magnet motors and a Grundfos
micro-frequency converter, we are able to deliver
unmatched performance and the ability to control and
communicate with the pump in ways never before
possible. A few of the features that result from this
combined technology are Constant Pressure Control,
Soft-Start, and Integrated Dry-Run Protection, but
these are just a few of the features these pumps offer.
SQ pump models operate at a constant speed much
like today's conventional pumps. The difference is that
SQ delivers the benefits of an electronically controlled
permanent-magnet motor that cannot be achieved with
a conventional induction motor.
SQ pumps are available for single-phase power; a
simple 2-wire design makes installation easy.
SQE pumps are equipped with a Grundfos "Smart
Motor." Like the SQ models, SQ pumps have a high
efficiency permanent-magnet motor - but we add the
ability to communicate.
The "Smart Motor" communicates via the CU301
status box through the power leads.
It is not necessary to run any additional wires down the
well. Communication with the pump provides Constant
Pressure Control and the highly useful ability to
change the pump performance while the pump is
installed in the well. Like the SQ motor, this is also a
2-wire motor designed for single-phase operation.
Dry-running protection
The pumps are protected against dry running. A value
of P
cut-out
ensures cut-out of the pump in case of lack
of water in the borehole thus preventing a burnout of
the motor.
P
cut-out
is factory-set both for the SQ and SQE pumps.
Fig. 1 P
cut-out
curve
High pump efficiency
The hydraulic pump components are polyamide
reinforced with 30 % glass fiber. The hydraulic design
provides for high pump efficiency resulting in low
energy consumption and therefore low energy costs.
High motor efficiency
The motors are based on a permanent magnet rotor
(PM motor) featuring high efficiency within a wide load
range.
Fig. 2 Efficiency curves of Grundfos SQ motor versus
conventional motors
TM01 2751 2298TM01 2698 2298
H
Q
cut-out
P
Q
P1
P
cut-out
200 250 300 350 400 450 500 550 P2 [W]
45
50
55
60
65
70
[%]
Eta
Conventional 1 ph
Conventional 3 ph
MS 3
Conventional 3-ph.
Conventional 1-ph.
SQ