Powerex SED1007, SED1007HP, SET1507, SET1507HP, SEQ2007 User Manual

10HP - 20HP Scroll Enclosure Air Compressors

Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the product described.
Protect yourself and others by observing all safety information. Failure to comply with instructions could result in personal injury and/or
property damage! Retain instructions for future reference.

DESCRIPTION

GENERAL

Powerex Scroll Enclosure Air Compressors are designed to
supply continuous oil-free air by using the most advanced
scroll technology. These turn-key packages are extremely quiet
and offer electronic control that will reduce electrical power
consumption.
The Powerex Oil-less Rotary Scroll Air Compressor has
advanced scroll compressor technology through the
development of a completely oil-less unit. The Powerex Scroll
Compressor offers a dynamically balanced air end which
insures vibration-free operation. The rotary design permits a
continuous 100% duty cycle. No oil separation, oil filtration,
or inlet valves are required on the Powerex Scroll unit. The
compressor is virtually maintenance free.
The Powerex Oil-less Rotary Scroll Air Compressor is based
on the theory of scroll compression. A scroll is a free standing,
intricate spiral bounded on one side by a solid, flat plane or
base. A scroll set, the basic compression element of a scroll
compressor, is made up of two identical spirals which form
right and left hand parts. One of these scroll components is
indexed or phased 180° with respect to the other so the scrolls
can mesh. Crescent-shaped gas pockets are formed and
bounded by the spirals and the base plate of both scrolls. As
the moving scroll is orbited around the fixed scroll, the pockets
formed by the meshed scrolls follow the spiral toward the
center and diminish in size. The moving scroll is prevented
from rotating during this process so the 180° phase
relationship of the scrolls is maintained. The compressor’s
inlet is at the outer boundary of the scrolls. The entering gas is
trapped in two completely opposite gas pockets and
compressed as the pockets move toward the center. The
compressed gas is discharged through the outlet at the center
of the fixed scroll so no valves are needed.

Table of Contents
Specifications Pg 1–2 Maintenance Pg 12
Safety Guidelines Pg 2-3 Electrical Pg 13-15

Installation Pg 3-7
Operation Pg 8-11

SPECIFICATIONS

Product SE Series Enclosed Scroll Air

Compressor

Performance
Specifications

Lubrication Grease-filled Bearing
Operating

Voltages
Compression

Cycle
Motor Overload

Protection
Pressure Settings Cut in: 90 psig Cut out: 116 psig

Overpressure
Protection

Outlet Air
Connections

Tank Sizes See Page 6, Chart 2
Drive 3V Belt

Agency Approvals UL/CSA Certified

See page 2

3Ø - 208-230/460/575 Volts, 60 Hz

Scroll

Motor Protector/Circuit Breaker

Cut in: 119 psig Cut out: 145 psig
(High Pressure Units)

Safety Valve Factory Set and Sealed

See page 2

Powerex - 150 Production Drive - Harrison, Ohio 45030 - USA
1-888-769-7979 - www.powerexinc.com

IN562802AV

Pg 1

04/13

10 HP - 20 HP Scroll Enclosure Air Compressors
SPECIFICATION CHART

Model HP Max

Pressure

PSIG

SED1007 10 116 30.4 208/230/460/575 53 1 Inch 38 x 26 x 61 825 67°F

SED1007HP 10 145 25 208/230/460/575 53 1 Inch 38 x 26 x 61 825 80°F

SET1507 15 116 45.6 208/230/460/575 56 1 Inch 38 x 26 x 61 965 67°F

SET1507HP 15 145 37.5 208/230/460/575 56 1 Inch 38 x 26 x 61 965 80°F

SEQ2007 20 116 60.8 208/230/460/575 58 1 Inch 38 x 26 x 61 1125 67°F

SEQ2007HP 20 145 50 208/230/460/575 58 1 Inch 38 x 26 x 61 1125 80°F

SCFM @

Max

Pressure

Voltage Noise

Level

dB(A)

Discharge

Connection

LxWxH
(inches)

Weight

(lbs.)

Discharge

Approach

Temp

Air

SAFETY GUIDELINES

This manual contains information that is very important to
know and understand. This information is provided for
SAFETY and to PREVENT EQUIPMENT PROBLEMS. To
help recognize this information, observe the following
symbols. MAKE SURE EVERYONE OPERATING OR
SERVICING THE COMPRESSOR READS AND
UNDERSTANDS ALL THE INFORMATION PROVIDED.

Danger indicates and

imminently hazardous situation which, if not avoided,
WILL result in death or injury.

Warning indicates a potentially

hazardous situation which, if not avoided, COULD result in
death or serious injury.

Caution indicates a potentially
minor or moderate injury.

Notice indicates important
information, that if not

followed, may cause damage to equipment.

GENERAL SAFETY INFORMATION

Since the air compressor makes up a high pressure system,
the following safety precautions must be observed at all
times.

1. Read all manuals included with this product
carefully. Be thoroughly familiar with the
controls and the proper use of the
equipment.

2. Follow all local electrical and safety codes
as well as in the United States, the National
Electrical Codes (NEC) and Occupational Safety and
Health Act (OSHA).

3. Only persons well acquainted with these rules of safe
operation should be allowed to use the compressor.

4. Keep visitors away and NEVER allow children in the
work area.

Pg 2

5. Wear safety glasses and use hearing
protection when operating the unit.

6. Do not stand on or use the unit as a
handhold.

7. Before each use, inspect compressed
air system and electrical components for signs of
damage, deterioration, weakness or leakage. Repair or
replace defective items before using.

8. Check all fasteners at frequent intervals for proper
tightness.

Motors,

electrical
equipment and controls can cause electri­cal arcs that will ignite a flammable gas or
vapor. Never operate or repair in or near a
flammable gas or vapor. Never store flammable liquids or
gases in the vicinity of the unit.

Never operate compressor pump without a
protective guard. This unit can start
automatically without warning. Personal
injury or property damage could occur
from contact with moving parts.

BREATHABLE AIR

WARNING

This unit is NOT equipped and should NOT be used “as
is” to supply breathing quality air. For any application of
air for human consumption, you must fit the air compres­sor with suitable in-line safety and alarm equipment.
This additional equipment is necessary to properly filter
and purify the air to meet minimal specifications for
Grade D breathing as described in Compressed Gas Asso­ciation Commodity Specification for Air, OSHA, ANSI
and/or Canadian Standards Associations (CSA).

DISCLAIMER OF WARRANTIES

IN THE EVENT THE COMPRESSOR IS USED FOR THE
PURPOSE OF BREATHING AIR APPLICATION AND
PROPER IN-LINE SAFETY AND ALARM EQUIPMENT
IS NOT SIMUTANEOUSLY USED, EXISTING
WARRANTIES ARE VOID, AND POWEREX
DISCLAIMS ANY LIABILITY WHATSOEVER FOR ANY
LOSS, PERSONAL INJURY OR DAMAGE.

10 HP - 20 HP Scroll Enclosure Air Compressors
GENERAL SAFETY CONT.

9. Do not wear loose clothing or jewelry that will get
caught in the moving parts of the unit.

Surface may be hot even if unit is stopped.

10. Keep fingers away from a running unit;
fast moving and hot parts will cause injury and/or burns.

11. If the equipment should start to vibrate abnormally,
STOP the unit and check immediately for the cause.
Vibration is generally a warning of trouble.

12. To reduce fire hazard, keep unit exterior free of oil,
solvent, or excessive grease.

An ASME code safety relief valve with a setting no higher
than the tank maximum allowable working pressure MUST
be installed in the air lines or in the tank of any compressor.
The ASME safety valve must have sufficient flow and
pressure ratings to protect the pressurized components from
bursting.

Do not operate with pressure
switch or pilot valves set higher

than the tank maximum allowable working pressure.

13. Never attempt to adjust ASME safety valve on
compressed air units. Keep safety valve free from paint
and other accumulations.

Never attempt to repair or modify a tank!
Welding, drilling or any other modification
will weaken the tank resulting in damage
from rupture or explosion. Always replace worn, cracked
or damaged tanks.

Drain liquid from tank daily.

14. Tanks rust from moisture build-up, which weakens the
tank. Make sure to drain tank regularly and inspect peri­odically for unsafe conditions such as rust formation and
corrosion.

15. Fast moving air will stir up dust and debris which may
be harmful. Release air slowly when draining moisture
or depressurizing a compressor system.

STORAGE

1. When not in use, the unit should be covered to prevent
the ingress of dirt and foreign matter and stored in a
cool, dry place.

2. If a tank is incorporated with the unit, the tank should be
drained of all moisture.

3. If the unit is using external hoses, they should be
disconnected and hung open ends down to allow any
moisture to drain.

INSTALLATION

Disconnect, tag and lock out power source
then release all pressure from the system
before attempting to install, service, relocate
or perform any maintenance.

Do not lift or move unit without

appropriately rated equipment.
Be sure the unit is securely attached to lifting device used.
Do not lift unit by holding on to tubes or coolers. Do not
use unit to lift other attached equipment.

Never use the wood shipping

skids for mounting the unit.

Do not locate the air inlet near

steam, paint spray, sandblast
areas or any other source of contamination.

NOTE: If compressor system is installed in a hot, moist
environment, supply compressor pump with clean, dry
outside air. Pipe supply air in from external sources.

Failure to properly install a tank can lead to
cracks at the welded joints and possible
bursting or leakage.

UNPACKING

After unpacking the unit, inspect carefully for any damage
that may have occurred during transit. Make sure to tighten
fittings, bolts, etc., before putting unit into service.

Do not operate unit if damaged

during shipping, handling or
use. Damage may result in bursting and cause injury or
property damage.

The compressor nameplate should be checked to see if the
unit is the correct model and voltage as ordered.

Pg 3

10 HP - 20 HP Scroll Enclosure Air Compressors
INSTALLATION CONT.

PRECAUTIONS DURING TRANSPORTATION AND
MOVEMENT
TRANSPORTATION BY FORKLIFT

Use openings for forklift under both sides of the unit.

Avoid damaging the panel with
tips of forklift.

TRANSPORTATION BY CRANE

Use openings at bottom of the unit to life up by cable, lifting
straps etc. Make sure all lifting devices are rated for the
maximum load.

Be sure to use pads in order to
protect the panels.

VENTILATION

1. If the scroll compressor is located in a totally enclosed
room, an exhaust fan with access to outside air must be
installed.

2. Never restrict the cooling fan exhaust air or the intake
cooling air.

3. Vent the exhaust air outside to prevent the compressor
from operating at high temperatures and shutting down.

4. Never locate the compressor where hot exhaust air from
other heat generating units may be pulled into the unit.

SUGGESTED VENTILATION SYSTEM

The temperature rise in the room must be kept to a maximum
of 10 F. The BTU capacity of the vent system should be sized
for the full operating HP rating of the compressor. Suggested
fan capacity at 0 static pressure is shown below. If static
pressure is higher, the fan capacity should be increased.

INSTALLATION SITE

1. The scroll compressor must be located in a clean, well lit
and well ventilated area. A contaminated area can clog the
intake filter and / or intake metal mesh.

2. The area should be free of excessive dust, toxic or
flammable gases, moisture and direct sunlight.

3. Never install the compressor where the ambient
temperature is higher than 104°F or where humidity is high.
High humidity will cause electrical short circuit and rusting
of components.

4. Clearance must allow for safe, effective inspection and
maintenance.

A minimum of 24 inches of
clearance for sides, 40 inch

clearance from the top is required.

5. If necessary, use metal shims or leveling pads to level the
compressor. Never use wood to shim the compressor.

Pg 4

Figure 3

An exhaust duct may be installed to capture the warm air
exiting the compressor enclosure. The opening of the exhaust
duct should be about 6 inches larger on each side than the
vent openings on the compressor top panel. The duct should
not obstruct removal of the top panel for service. Leave be­tween 8 and 12 inches of clearance. The cfm capacity of the
cooling fan should be increased to compensate for duct flow
losses.

Figure 4

Model

Exhaust CFM Required

Figure 3 Figure 4

SED1007 2650 885
SET1507 3885 1415
SEQ2007 5300 1770

Chart 1

10HP - 20HP Scroll Enclosure Air Compressors

INSTALLATION Cont’d

WIRING

All wiring and electrical connections must be performed by
a qualified electrician. Installations must be in accordance
with local and national codes.

Overheating, short circuiting
and fire damage will result from

inadequate wiring.

Wiring must be installed in accordance with National Electric
Code and local codes and standards that have been set up
covering electrical apparatus and wiring. Consult the codes
and standards and observe local ordinances. Be certain that
adequate wire sizes are used, and that:

1. Service is of adequate ampere rating.

2. The supply line has the same electrical characteristics
(voltage cycles and phase) as the motor.

3. Ensure the line wire is the proper size and that no other
equipment is operated from the same line. The chart
gives the recommended wire sizes for horsepower of
motor provided.

Recommended wire sizes may be larger than the mini mum
set up by local ordinances. If so, use the large size wire to
prevent excessive line voltage drop.

MINIMUM WIRE SIZE

O

USE 75

HP

3 10 AWG 14 AWG 14 AWG
5 8 AWG 12 AWG 14 AWG

7.5 8 AWG 10 AWG 12 AWG
10 N/A 8 AWG 12 AWG
15 N/A 6 AWG 10 AWG
25 N/A 3 AWG 8 AWG

The additional wire cost is very small compared with the cost
of repairing or replacing a motor electrically “starved” by the
use of supply wires which are too small.

GROUNDING

Improperly grounded electrical components
are shock hazards. Make sure all the compo­nents are properly grounded to prevent death
or serious injury.

This product must be grounded. Grounding reduces the risk
of electrical shock by providing an escape wire for the
electrical current if short circuit occurs.

C COPPER WIRE

Single

Three Phase

Phase

230V 208/230V 460/575V

All electrical hook-ups must be performed by a qualified

electrician. Installations must be in accordance with local and
national electrical codes.

1. A service disconnect and fuses or a circuit breaker must be
installed to supply electric power to this compressor. Make
sure the circuit is sized to handle the full operating load as
shown in the table on the wiring diagram. Branch circuit
protection must be provided as specified in National Electric
Code, Chapter 2, “Wiring Design and Protection,” Article
210, using the applicable article “For Motors and Motor
Controllers.” (Article 430)

2. Remove the front panel to access the wiring area.

3. Using the appropriate strain relief and cable management
techniques, connect the power cable to the power junction
block and the ground wire to the ground bar.
Consult your NEC and local codes for wire size.

GENERAL FAULT DRY CONTACT CONNECTION

1. Turn the compressor off and lockout the power to the
compressor per OSHA standards.

2. Remove the door panel from the scroll cabinet to access
the operating panel.

3. Output wires should be connected between terminals 10
and 11. The dry contacts are normally closed; when there is a
fault or loss of power to the system, the contacts open. The
contact rating is as follows: 240 VAC/2A or 30VDC/2A,
maximum.

4. For larger load devices such as a horn or emergency light,
a relay should be used.

5. The signal wires should be between 24 and 12 AWG and
run through the grommet provided beneath the terminal
blocks.

6. Replace the door panel to the scroll compressor cabinet.

7. Return the power to the compressor system.

PIPING

Never use plastic (PVC) pipe for compressed air. Serious
injury or death could result.

Any tube, pipe or hose connected to the unit must be able to
withstand the temperature generated and retain the pressure.
All pressurized components of the air system must have a
pressure rating higher than or equal to the ASME safety valve
setting. Incorrect selection and installation of any tube, pipe
or hose could result in bursting and injury.

MINIMUM PIPE SIZE FOR

COMPRESSED AIR LINE

Length of Piping System

CFM

10 1/2” 1/2” 1/2” 3/4”
20 3/4 3/4 3/4 1
40 3/4 1 1 1
60 3/4 1 1 1

100 1 1 1 1- 1/4

25’

50’ 100’ 250’

Pg 5

10HP - 20HP Scroll Enclosure Air Compressors

INSTALLATION Cont’d

Never install a shut-off valve between a compressor pump
and the tank without an appropriate safety valve. Personal
injury and/or equipment damage may occur. Never use
reducers in discharge piping.

When creating a permanently installed system to distribute
compressed air, find the total length of the system and select
pipe size from the chart. Bury underground lines below the
frost line and avoid pockets where condensation can gather
and freeze.
Apply air pressure to the piping installation and make sure all
joints are free from leaks BEFORE underground lines are
covered. Before putting the unit into service, find and repair
all leaks in the piping, fittings and connections.
Select the size of the air receiver so that the combined volume
of the air receiver and facility piping results in a long enough
cycle time to keep any individual motor from starting more
than once every 3.43 minutes. Selecting the widest possible
spread between high and low system set point pressure along
with the largest differential for each pump interval will
reduce the starting frequency.
The table below shows the recommended tank size in gallons
per model. Some conditions of air usage may require
additional volume.

REMOTE INTAKE PIPING

Powerex compressor systems with pipe thread connectors on
the intake filters are intended for installation with remote air
intake. Piping for the remote intake system should be
installed at the final operating site.
Under some conditions, the intake piping may facilitate the
condensation of humidity in the intake air stream into liquid
water.
THE INTAKE FILTERS SUPPLIED BY POWEREX WILL
NOT STOP INGESTION OF LIQUID WATER BY THE
PUMPS. LIQUID WATER GOING INTO THE PUMPS

WILL DAMAGE THE PUMPS AND VOID THE
WARRANTY.

Always install drip legs with

sufficient capacity to capture
liquid water in the intake piping before the air filters. Drip
legs must be sized with low enough air velocity to make sure
they are effective at capturing liquid water in the intake air
and must be maintained (drained) at frequent intervals to
make sure they remain effective.

SAFETY VALVES

Safety Valves must be installed on every receiver. The flow
capacity of a safety valve should be equal to or greater than
the capacity of the compressor.

1. The pressure setting of the safety valve must not be greater
than the maximum working pressure of the air receiver.

Differential* SED SET SEQ

2. Safety valves should be placed ahead of any possible
blockage point in the system, i.e. shutoff valve.

Min 80 120 200
Standard 60 80 120
Max 30 60 80

Chart 2

Pressure setting selected on control panel

*

1. Make sure the piping is lined up without being strained or
twisted when assembling the piping for the scroll compressor.

2. Appropriate expansion loops or bends should be installed
at the compressor to avoid stresses caused by changes in hot
and cold conditions.

3. Piping supports should be anchored separately from the
compressor to reduce noise and vibration.

4. Never use any piping smaller than the compressor
connection.

5. Use flexible hose to connect the outlet of the compressor to
the piping so that the vibration of the compressor does not
transfer to the piping.

3. Avoid connecting the safety valve with any tubing or
piping.

4. Manually operate the safety valve every six months to
avoid sticking or freezing.

CHECK VALVES

Do not install a check valve between the compressor and the
air receiver or facility piping. If a check valve is installed, the
compressor pressure sensor will see rapid pressure drops and
cause short cycling of the motors and other control problems.

ISOLATION VALVES

An isolation valve should be installed between the
compressor and an external air receiver to facilitate
maintenance and control air flow out of the unit. Make sure
the valve is open when operating the compressor. A second
isolation valve should be installed between the air receiver
and the facility piping.

TANK MOUNTING

Bolt an external air receiver on a flat, even, concrete floor or
on a separate concrete foundation. Use vibration isolators
between the tank leg and the floor. After placing unit on
vibration pads, do not draw bolts tight. Allow the pads to
absorb vibrations. Install a flexible hose or coupling between
the tank and service piping.

Pg 6

10HP - 20HP Scroll Enclosure Air Compressors

INSTALLATION Cont’d

CONTROL PANEL - DISPLAY AND INPUT

The Powerex scroll enclosure air compressor has a power
control switch and a touch screen or HMI panel on the front
to allow operation and monitoring of the unit. See Controls
section for details on operating the unit using the touch
screen.

The switch below the screen controls power to the
motor starters. When the system is energized the HMI screen
will be lit and active, but the motors will not run until the ON
button is pushed. When ON is pushed, the center section of
the switch will illuminate, enabling PLC control of the sys­tem, and will remain lit until the OFF button is pushed. The
OFF button on the switch may be used to stop the compres­sors at any time. The switch does not turn off power to the
panel so be sure to lock out the power source before opening
the panel for service.
NOTE: The "Jog" function on the HMI screen overrides the
ON switch. The motors will operate if the Jog button is
continually depressed. To reach "JOG" press the SYSTEM
STATUS button, then press PUMP INFO for the pump
module you want to jog.

The PUMP INFO screen is shown below. Press the “JOG”
button to jog pumps.

Use the < arrow button to go back and select the next pump.

If the SYSTEM STATUS screen is not visible, go back to the
MAIN screen and select SYSTEM STATUS. (see below)

Pg 7

10HP - 20HP Scroll Enclosure Air Compressors

OPERATION

BEFORE START UP

1. Make sure all safety warnings, labels and instructions have
been read and understood before continuing.

2. Remove any shipping materials, brackets, etc.

3. Confirm that the electric power source and ground have
been firmly connected.

4. Check the belts for tightness.

5. Be sure all pressure connections are tight.

6. Check to be certain all safety relief valves etc., are the
proper size.

7. Securely mount all panels and guards.

8. Check that all fuses, circuit breakers etc., are the proper
size.

9. Make sure the inlet filter is properly installed.

10. Secure the area in front of the compressor to prevent
unauthorized access during this check. Remove the front
access panel so that the motor pulley on each set is visible.

Check motor rotation before
operating the unit.

Turn power on the unit and exercising extreme caution, use
the HMI display/input screen to jog each motor. (To reach the
JOG function, select SYSTEM STATUS from the MAIN
screen, then select PUMP INFORMATION for each installed
pump/motor set) Correct rotation is CW looking at the pulley
from the motor side. All motors should rotate in the same
direction. If all or any of the motors rotate incorrectly, lock
out the power, correct the input wiring and recheck. Restore
the front access panel before operating the unit.

INITIAL START UP AND SET UP OF THE CONTROL

The control is programmed at the factory and default settings
are installed. To access certain control functions you will
need to enter a seven digit authorization code. You may select
your own code. We recommend using the last seven digits of
the unit serial number.
To enter the code, from the SYSTEM STATUS screen touch
SELECT SETPOINT.

Go to PG 2 of the SELECT SETPOINT screen.

Touch the rectangle to enter the Authorization Code and enter
seven digits using the keypad that appears. Powerex suggests
using the last seven digits of the serial number.

START-UP AND OPERATION

1. Follow all the procedures under “Before start-up” before
attempting operation of the compressor.

2. Switch on the electric source.

3.Verify the display screen is lit.

4. If an isolation valve is installed between the compressor
unit and the air receiver, make sure it is open. Close the
isolation valve between the air receiver and the facility
piping.

5. Pushing the ON button below the touch screen will allow
unit to start and operate automatically. Pushing the OFF but­ton will stop the motors, but the HMI screen will remain ac­tive.

6. If the pressure does not rise, turn the unit off, the unit is
running backwards. Have a qualified electrician switch the
breaker OFF and exchange two out of the three phases of
electrical source. If pressure is rising, allow the compressor
unit to run. Each compressor motor will automatically turn
off as the pressure rises and the maximum operating pressure
is reached. Pressure settings may be adjusted as described
below.

7. Open the isolation valve between the air receiver and the
facility piping. The compressor will start and stop each pump
as needed to maintain the pressure between the high and low
set points.

8. After a few hours and again after a few days, check the
display screen to see if the ALARM screen has appeared. If a
HIGH TEMPERATURE or MOTOR OVERLOAD condition
occurs, the alarm screen will appear and the affected
pump-motor will be taken out of service. If the chosen
settings are causing the motors to start too frequently, the
ALARM screen will appear and the MOTOR WARNING
indicator will illuminate. Motor warning will not take the
motor out of service, but the user should take action to
prevent motor overload and damage. To reduce motor starting
frequency, adjust the set points to a wider range between
High and Low and possibly increase the differential. If
starting is still too frequent, a larger or additional air receiver
will be needed.

The second page of the SETUP screen will appear.

Pg 8

10HP - 20HP Scroll Enclosure Air Compressors

OPERATION Cont’d

SHUT-DOWN

1. Stop the compressor by pushing the OFF button.
NOTE: If the compressor rotates in reverse for more than
five seconds, the check valve needs to be cleaned or replaced.

2. Switch the breaker OFF if the compressor is not to be used
for a long period of time.

STOPPING THE COMPRESSOR DURING
EMERGENCY OPERATION

Stop the compressor by pushing the OFF button or by turning
the power off at the main disconnect panel.

MULTI-STAGE CONTROL

As this compressor uses plural air ends, it employs
multi-stage control. It can start and stop each air end
according to pressure and air consumption, automatically
select the number of air ends in accordance with air
consumption and achieve optimum and uniform operation at
all times as well as energy-saving and labor-saving operation.

1. Multi-stage control - Among air ends which are operating
under group control, it stops the air end which has been
operating for a longer time and restarts the air end whose
operating time has been shorter, thus resulting in equalization
of operating time of each air end and operation with a min.

quantity of air ends in accordance with air consumption and
energy-saving operation by eliminating waste of electricity.
The chart below shows the relationship between pressure and
the quantity of air ends operating for an SEQ model. The
same concept is applied to 3 air ends for an SET and 2 for an
SED. 2. Automatic Alteration: When air demand allows one
or more air ends to remain idle, the control will automatically
shift operation to equalize usage after 10 minutes. If air
demand increases and pressure drops, the control will
energize additional air ends as needed, starting the one with
the longest off time first. The control will also de-energize air
ends as pressure rises.

3. The control allows the user to adjust the pressure settings.
To minimize power consumption, the user should select the
lowest maximum pressure that is suitable for the operations
being performed. The smallest gap between minimum and
maximum pressure that avoids too frequent motor starting
should also be selected.

4. The control will automatically prevent multiple motors
from starting simultaneously by inserting a three second
delay.

The sequence is an

example of operation

of SEQ2007.

SET1507 operate 3 air

ends, SED1007

operate 2 air ends.

Pg 9

10HP - 20HP Scroll Enclosure Air Compressors

OPERATION Cont’d

OPERATING PANEL & SETTINGS

The Scroll Enclosure Air Compressor is controlled by a PLC
programmed at the Powerex factory. The operating status is
displayed on the HMI– touch screen panel on the front of the
compressor unit. The touch screen allows the user to select
operating parameters within predetermined limits set at the
factory. The touch screen also allows the user to change the
display to get more information about the operation of the
individual compressor modules and to take action based on
alarms and warnings. This enclosed scroll system utilizes a
PLC for alternation and will change the pump sequence
(Lead, Lag1, Lag2 etc) after every start or after 10-minutes,
which ever happens first. The HMI offers a MIN and MAX
system setpoint and three calculated pressure differential
settings. (Standard, Min and Max)

The factory default settings for HIGH and LOW Operating
Pressures are:

Standard Models 90-116 PSIG

High Pressure Models 119-145 PSIG

Differential setting default is STANDARD

Pressure and by selecting the widest differential.

To minimize power consumption, select the lowest possible
HIGH operating pressure and the smallest differential that
avoids exceeding the motor start frequency limit.

PERFORMING PRESSURE ADJUSTMENTS

The above display is the SYSTEM STATUS screen. (For
SED and SET models, only two and three sets of buttons/
indicators will be shown).
To adjust pressure settings, touch the SELECT SETPOINT
button. The screen will change to this display:

Limits to difference between HIGH and LOW setpoints:

Maximum Differential 50 PSIG

Minimum Differential 16 PSIG

The control automatically divides the range between HIGH
and LOW Operating Pressure into equal operating intervals.
The differential for the operating intervals may be adjusted by
selecting STANDARD, MIN or MAX on the set up screen.

In STANDARD, the differential will be automatically set to
have a slight overlap between the individual pump intervals.
Each interval will be 135% of the possible minimum value.

In MIN, the differential will be automatically set to divide the
available range into equal intervals with no overlap. The
selection will result in the most frequent starting of the
electric motors for a given Operating Pressure range.

NOTE: more frequent motor starting can lead to reduced
motor life. Exceeding 17.5 starts per hour will cause a
warning display.

In MAX, the differential will be automatically set to increase
the overlap as compared to the Standard setting. Each interval
will be 235% of the possible minimum interval. Select this
mode to minimize the frequency of motor starts. Motor start
frequency can be reduced by using larger air receiver tanks,
selecting a wider range between HIGH and LOW Operating

Touch the screen at either the HIGH SET or LOW SET
button/indicator. A key pad display will be shown. Enter the
desired pressure setting using the key pad and touch ENT.

CLR is clear, use it to backspace one digit.
CAN or Cancel, voids the whole input, use it to start over.

Pressure settings must be entered as whole numbers, no
decimal or factions. The individual intervals will be
calculated and shown in the display boxes on the right side of
the setting screen. If number are entered that are out of the
allowed range, the input will be scaled back to the range
limit.

Pg 10