Hitachi SRL-7.5M6LL, SRL-11M6ML, SRL-11M6LL, SRL-7.5M6Ml, SRL-11M6LH Instruction Manual

Instruction Manual

SRL-Series

HITACHI OILFREE SCROLL COMPRESSOR

Model　 ： SRL-7.5M6LL/SRL-7.5M6ML
SRL-7.5M6LH/SRL-7.5M6M

H
SRL-11M6LL/SRL-11M6ML
SRL-11M6LH/SRL-11M6M

H
SRL-16.5M6LL/SRL-16.5M6ML
SRL-16.5M6LH/SRL-16.5M6M

H

CM1E029-00 Jul. 2011

Thank you for the recent purchase of a HITACHI Oilfree Scroll Air Compressor.
Please read this instruction manual carefully for installation, maintenance and
inspection guidelines of the HITACHI Scroll Air Compressor. After reading this
instruction manual, please keep it on hand for future reference.

Pressure Units Clarification

Pressure is indicated in units of
"psig" in this Instruction Manual.
Please review the table below
fo r th e co nve rsio n of "p s ig"
units to "MPa" units.

Unit of pressure

measurement

psig 122 145

MPa 0.84 1.0

Conversion - 1 psig = 0.00689 MPa

Attention

● The SRL air compressor is a piece of equipment for producing compressed air. The use of the SRL air
compressor should be limited to general industry. Since handling compressed air can be dangerous, the
operator should use the SRL air compressor only after acquiring technical knowledge. HITACHI
assumes no responsibility for machine failure, personal injury or an accident caused by the use of the
SRL air compressor without the operator acquiring relevant technical knowledge.

● The SRL air compressor is designed for indoor use.

● Personnel in charge of operation, maintenance and inspections of the SRL air compressor should have
easy access to this instruction manual.

● Thoroughly read this instruction manual and the SRL warning label to obtain vital information regarding:
○ Proper Installation ○ Proper Operation ○ Maintenance and Inspection
○ Safety Guidelines

○ Warning and Caution Information

● Observe the operating ranges of the air compressor in the instruction manual prior to use. To prevent
failures from occurring, perform proper maintenance and inspection.

● Do not operate, handle or modify the air compressor in any way that is not described in the instruction
manual and use genuine HITACHI parts when performing maintenance. HITACHI shall assume no
responsibility for any accidents and/or failures to the air compressor attributed to the above.

● If any description in the instruction manual in unclear, please contact the local Hitachi distributor.

● Sections of this instruction manual may be subject to change without notice.

● If service is required and/or an alarm occurs, please contact the local Hitachi distributor with the
following information:
○ Model and Serial Number
○ Vital information regarding the status of the air compressor (for example, alarm information in as
much detail as possible).

● Do not reprint and/or reproduce any section of this instruction manual without permission from Hitachi.

Safety Precautions

Improper use of the Oilfree Scroll Air Compressor may result in an accident or injury. Thoroughly read the
instruction manual before proceeding with installation, operation, maintenance or inspection of the air
compressor. Before using the air compressor, become familiar with all of the air compressor equipment,
safety information and the safety precautions. Dangerous and important information are highlighted by
the WARNING and CAUTION graphics. These graphic descriptions are detailed below.

Serious injury :

Injury :

Property Damage :

These safety precautions cover vital safety aspects of the Oilfree Scroll Air Compressor. Make sure to
establish safety measures in accordance with local and national codes and standards.
Hitachi Industrial Equipment Systems Co., Ltd. shall assume no responsibility for anything resulting from
disregard to these safety precautions.

Graphic Descriptions

This is a warning. If handled improperly, death or severe injury could result.

This is a caution. If handled improperly, injury and/or physical damage could result.

WARNING
CAUTION

Serious injury indicates the following could occur: blindness, injury, burns (mild and
excessive), electric shock, and/or toxic poisoning that require hospitalization or long
term medical treatment.
Injury indicates the following could occur: burns, electric shock that does not require
hospitalization or long term medical treatment.
Property damage means the foll owing could occur: breaks and /or dama ge to
equipment.

This is a Prohibited Operation.
Any operation illustrated by this symbol is strictly prohibited.

Prohibition

S-1

Avoid installing the air compressor in the dangerous areas described below:

● Avoid places subject to rain, water and/or high humidity.

Failure to adhere to this precaution
may cause electric current leakage,
rust and/or reduction in air compressor
life.

● Avoid outdoor installation or areas
subject to direct sunlight.

Failure to adhere to this
precaution may cause air
compressor overheating,
discoloration, alteration
and/or deterioration.

● Avoid areas subject to foreign matter, such as: iron powder,
sand dust, powdered dust, wood chips, textile waste, stone
powder, and fine iron powder fumes.
Failure to adhere to this precaution

may cause premature clogging of
the air filter and aftercooler fins,
excessive temperature rise,
air compressor
damage and
reduction in life
and/or explosive
accidents.

● Avoid areas where corrosive gases are present, such as:
organic solvents (benzene, toluene, etc.), acid, chloride gas,
ozone gas, ammonia, significant oil mists
and/or bromine.
Failure to adhere to this precaution may

cause rust to the air compressor components
and/or reduction in air compressor life.

● Avoid areas of close proximity to explosives and/or flammable
gases, such as: acetylene, propane gas, organic solvents,
explosive powdered dust and/or fire.
Failure to adhere to this precaution

may cause accidents.

Safety Precautions (continued)

S-2

Items requiring extra safety attention are described below. Observe the items described below, as well
as other items in the instruction manual that require safety attention.

● Do not use the air compressor to compress any gas other than air.
Using the air compressor to compress any gas other than air may lead to damage of the air compressor.

● SRL air compressors are not designed, intended or approved for breathing air applications. Hitachi does
not approve specialized equipment for breathing air applications and assumes no responsiblity or liability
for compressors used for breathing air services.

● If the scroll air compressor is used for any important production equipment, it is highly recommended to
utilize a back up air compressor.
A back up air compressor will keep production running in the event of a failure to an air compressor.

● Oil, dust and abrasive powder may be present in the air, and can be ingested into the air compressor
and mixed into the compressed air discharge.

Installation Safety Precautions

● Make sure that the installation ares has sufficient space for ventilation cooling. The compressor should
operate at room temperature in between 32 ゜ F and 104° F. If the room temperature exceeds104° F,
the air compressor's protective devices will stop compressor operation.
Excessive temperatures may lead to reduction in bearing life, seal life and seizure of the scroll head.

● Do not install the air compressors in a high location where the air compressor or air compressor parts
can be dropped.

● Install a pressure tight, heat resistant rubber hose at the compressed air discharge.
Do not use improper rubber hose or flexible tubing as they may crack and/or break.

● Verify that the power supply is 208/230/460 volt, 3 phase, 60 Hertz.
Failure to adhere to this precaution may cause motor and/or start failure.

● Do not install heavy objects, such as a filter, directly on the compressed air discharge.

Installing heavy objects on the compressed air discharge can cause damage to the piping and/or an accident.

WARNING

CAUTION

CAUTION

WARNING

Prohibition Prohibition

Prohibition

Prohibition

Safety Precautions (continued)

S-3

● If the Compressor Operation light is lit, keep all human body parts away from the rotating parts (pulley,
V-belt and ventilating fan) of the air compressor, as the air compressor will automatically start when
pressure drops.
Failure to adhere to this precaution may cause injury and/or accidents.

● Do not touch the air piping and check valve inside the air compressor package during operation and
immediately after the air compressor has stopped, as they will generate excessive heat.

Failure to adhere to this precaution may cause burns.

● Do not operate the air compressor with an inverter and/or generator.
Failure to adhere to this precaution may cause damage to the air compressor and/or accidents.

● Make sure to ground (earth) the air compressor.
Failure to adhere to this precaution may cause electric shock and/or injury.

● Remove all the transport fixtures prior to operation. (7.7/11kW : 2 locations, 16.5kW : 3 locations)
Failure to adhere to this precaution may cause excessive vibration and/or damage to the air compressor.

● Turn off the power supply during a power failure and/or electric storm.
Failure to adhere to this precaution may cause damage to the air compressor and/or accidents.

Operation Safety Precautions

WARNING

CAUTION

Maintenance and Inspection Safety Precautions

● Carry out the standard scheduled maintenance and service (See page 21).
Failure to adhere to this precaution may cause damage to the air compressor and/or accidents.

● Before performing any maintenance and/or inspection, ensure that the power supply has been
disconnected and all compressed air in the air receiver and air compressor piping has been released.

Failure to adhere to this precaution may cause electric shock and/or injury.
【122PSIG Model】

● Contact the local Hitachi distributor for the completion of the maintenance required every 10,000
hours or every 4 years of standard use. The maintenance has to be completed in this period, or earlier
depending on the operating environment. Do not operate beyond the scheduled period.
Failure to adhere to this precaution may cause damage to the air compressor and/or accidents.

For more details, contact the local Hitachi distributor.
【145PSIG Model】

● Contact the local Hitachi distributor for the completion of the maintenance required every 5,000 hours
or every 2 years of standard use. The maintenance has to be completed in this period, or earlier
depending on the operating environment. Do not operate beyond the scheduled period.
Failure to adhere to this precaution may cause damage to the air compressor and/or accidents.

For more details, contact the local Hitachi distributor.
【122PSIG Model】

● Contact the local Hitachi distributor for the completion of the overhaul required every 20,000 hours or
every 8 years of standard use. The overhaul has to be completed in this period, or earlier depending on
the operating environment. Do not operate beyond the scheduled period.
Failure to adhere to this precaution may cause damage to the air compressor and/or accidents.

For more details, contact the local Hitachi distributor.
【145PSIG Model】

● Contact the local Hitachi distributor for the completion of the overhaul required every 10,000 hours or
every 4 years of standard use. The overhaul has to be completed in this period, or earlier depending on
the operating environment. Do not operate beyond the scheduled period.
Failure to adhere to this precaution may cause damage to the air compressor and/or accidents.

For more details, contact the local Hitachi distributor.

● For maintenance and service inspections, please contact the local Hitachi distributor.

● Do not remove or modify the safety devices and/or insulating parts of the air compressor.
Failure to adhere to this precaution may cause damage to the air compressor and/or accidents.

● Use genuine HITACHI parts when maintaining or servicing the air compressor.
Failure to adhere to this precaution may cause damage to the air compressor and/or accidents.

● Do not use the air receiver if it has developed a leak. Do not attempt to repair or rework a leaking air
receiver.
Failure to adhere to this precaution may cause personal injury, damage to the air compressor and/or pressurized

rupture.

WARNING

Introduction

The instruction manual gives details related to the specifications, construction, installation, operation,
maintenance and inspection of the Oilfree Scroll Air Compressor.
This instruction manual describes the proper operation method to smoothly and safely utilize the
functions of the Oilfree Scroll Air Compressor.

Table of Contents

1

● Daily Operating Components

● Installation

1. Product Confirmation

2. Transporting the Air compressor

3. Installing the Air compressor

4. Piping the Air compressor

5. Wiring the Air compressor

● Operation

1. Control Panel Descriptions

2. Prior to Operation

3. Start Up

4. Daily Operation

● Maintenance and Inspection

● Troubleshooting

● Parts List

● Wiring Diagram

● Standard Specifications

● Aftermarket Ordering Procedure

・・・・・・・・・・ 2

・・・・・・・・・・ 4

・・・・・・・・・・ 4

・・・・・・・・・・ 4

・・・・・・・・・・ 5

・・・・・・・・・・ 7

・・・・・・・・・・ 8

・・・・・・・・・・ 12

・・・・・・・・・・ 12
・・・・・・・・・・ 14

・・・・・・・・・・ 19

・・・・・・・・・・ 20

・・・・・・・・・・ 21

・・・・・・・・・・ 29

・・・・・・・・・・ 33

・・・・・・・・・・ 34

・・・・・・・・・・ 36

・・・・・・・・・・ 37

Safety Precautions (continued)

● If the air compressor has not run in over one (1) month, carry out the long term storage operation
prior to restarting the air compressor (See page 28).
Failure to adhere to this precaution may cause abnormal wear to the air compressor components, damage to the air

compressor and/or accidents.

● Verify that the front door chain has been connected before closing the door.

● Make sure the V-belt is tightened properly prior to operation. If the V-belt is loose, tighten the V-belt
prior to operation.
Failure to adhere to this precaution may cause belt slippage, damage to the air compressor and/or excessive noise.

CAUTION

Daily Operating Components

2

Air Compressor Exterior

● Do not leave the front door open during operation.
Failure to adhere to this precaution may cause dust to be ingested, excessive vibration and/or noise to be

generated and/or reduction in air compressor life due to excessive temperature rise.

CAUTION

Air Exhaust

Air Intake

● Intake air and cooling
air is supplied to the air
compressor.

Compressed Air

Discharge Pipe

Power Cable Inlet

Control Panel

Locks for door

enclosure with Keys

Front Door

Emergency Stop

Switch

SRL-7.5M6LL/ML/LH/MH

SRL-11M6LL/ML/LH/MH

SRL-16.5M6LL/ML/LH/MH

● Make sure that front
door is closed during
the operation of the air
compressor.

Air Exhaust

Air Intake

● Intake air and cooling
air is supplied to the air
compressor.

Compressed Air

Discharge Pipe

Power Cable Inlet

Control Panel

Locks for door

enclosure with Keys

Front Door

Emergency Stop

Switch

● Make sure that front
door is closed during
the operation of the air
compressor.

Daily Operating Components(continued)

3

Air Compressor Interior

Check Valve

Scroll Head

Air Release Valve

Power Supply Panel

Electric Main Motor

Rubber Vibration

Isolators

V-BeltPrimary Cooler

Ventilating Fan

SRL-7.5M6LL/ML/LH/MH

SRL-11M6LL/ML/LH/MH

SRL-16.5M6LL/ML/LH/MH

Safety Relief Valve

Rubber Hose

Intake Air Filter

● 10HP (7.7kW) : 3 locations

● 15HP (11kW) : 4 locations

Transport Fixture

● 2 locations

Secondary Cooler

Main Power Supply

Terminal Block

Electromagnetic

Contactor

Check Valve

Scroll Head

Air Release Valve

Power Supply Panel

Electric Main Motor

Rubber Vibration

Isolators

V-Belt

Primary Cooler

Ventilating Fan

Safety Relief Valve

Rubber Hose

Intake Air Filter

● 6 locations

Transport Fixture

● 3 locations

Secondary Cooler

Main Power Supply

Terminal Block

Electromagnetic

Contactor

Ventilating Fan

Installation

4

● It is recommended that properly trained personnel move the air compressor.

● Operation of the air compressor with the transport fixtures installed will lead to excessive vibration
of the air compressor and the package may rupture. The transport fixtures must be removed prior
to operation of the air compressor.

WARNING

1 Product Confirmation

1. Check the air compressor nameplate to verify that
the proper model air compressor was delivered.

2. Verify that there has been no damage to the air
compressor during transportation.

3. Verify that the items shown below are included
with the air compressor.

Rubber

vibration

sheets for

installation -

4 Sheets

Instruction

Manual

1 copy

4 - Steel

plates

＆ 8 - Bolts

Model Nameplate

● Review the model
number, serial number,
power requirements and
compressor
specifications.

Warning Label

● Read the Warning Label
before use.

● Do not use an air compressor with
a power supply differing from the
specified power requirement.
Incorrect power supply may cause
fire and/or abnormal vibration.

CAUTION

2 Transporting the Air Compressor

Transporting the Air Compressor Removing the Transport Fixtures

Moving with a Forklift

P l a c e a bu f f e r pl a t e in
between the air compressor
and the forklif t to prote ct
the air compressor panels.

Do no t t i l t th e for k s o f
the forklift too much. Too
much tilt may cause the air
compressor to drop.

Remove the transport fixtures

Bolt

Fixture

Transport Fixtures Location

● After installing air compressor, please
be sure to attach the plates shown in
the figure to the right.
These plates are shipped with the
compressor and will greatly reduce
compressor noise during operation.

【Reference】

● Open the front door, remove the yellow bolts and
remove the transport fixtures prior to operating.

7.7/11kW : 2 locations

16.5kW : 3 locations

1. Install the air compressor inside a room with adequate space, ventilation and relatively low humidity.

2. Keep the operating room temperature in between 32° F and 104° F.

3. Install the air compressor with the recommended spacing shown in the figure below for ease of
maintenance and temperature control.
・The air compressor is designed to inhale air from the left side of the package and exhaust the air out
of the top of the package. It is recommended to provide suction and exhaust openings as shown in
the figure below to properly ventilate the room. If the suction and exhaust openings cannot be
provided, do not modify the air compressor without consulting the local Hitachi distributor.

4. The allotted space located to the right and to the rear of the air compressor must be maintained
to perform maintenance. Ensure that this space is maintained if the air compressor is going to be
permanently installed. (#)

A B

Installation(continued)

5

3 Installing the Air Compressor

Ventilating fan

● If the temperature exceeds 104° F in the
room, install a ventilating fan to keep the
room temperature below 104° F.

● Select a ventilating fan with more than
enough capacity to handle the air flow of
the room.

Maintenance Space,
Intake Air, Discharge

Piping and Wiring

● Secure enough space for proper ventilation.

● Absence of intake space causes the suction resistance to
increase, resulting in temperature rise in the package, which may
cause a reduction in the life of air compressor components.

● Secure enough space for wiring and piping.

Ventilation and

Exhaust Space

● Secure enough space for proper
ventilation.

● Absence of intake space causes
the suction resistance to increase,
resulting in temperature rise in the
package, which may cause a
reduction in the life of air
compressor components.

Maintenance Space for

Right ＆ Rear Sides

● If a space of more than 12 in.
and/or 20 in. cannot be secured,
utilize a piping connection that
can be easily removed for
maintenance purposes.

Front Maintenance Space

● Secure the proper amount of
space to open the front door of
the air compressor for inspection.

Exhaust duct

● Do not directly connect the duct with the
air compressor. The ducting hood should
maintain a distance (indicated as “h”)
between the air compressor and the duct
that is larger than the diameter of the duct.

h

Exhaust

air

40 in. or more

Exhaust
Opening

Intake
Opening

Exhaust
air

I

ntake
air

I

ntake
air

12 in.
or more (#)

20 in.
or more (#)

Exhaust
air

40 in. or more

25 in. or more

Intake Opening

● The intake opening should be installed as
low as possible. The area of the opening
should be calculated as 1,550 sq in.(1m

2

)

per compressor1.

● Conditions of the ambient air, including
dust and toxic substances, should be
considered when selecting the location
for the intake air opening.

【Reference】

■ Guidance for construction of ventilating fan and exhaust duct

Exhaust Air

Exhaust Air
of air
compressor

Intake Air

■ Ventilating Fan
Refer to the v olu me of
necessary ventilation (1).

Intake Air

Ex h a u s t
Duct

■ Ventilating Fan
Refer to the v olu me of
necessary ventilation (2).

5. Install the Air Compressor on Level Ground with a Sufficient
Weight Load. If there is a gap between the air compressor
and the ground, adjust the gap with the attached rubber
vibration isolators to eliminate the gap.

6. For parallel operation, install the air compressors as shown
in the figure to the right. If the air compressors cannot be
installed as shown in the figure to the right, install in a way
that prevents the exhaust of one air compressor from
entering the air intake of the other air compressor.

Installation(continued)

6

● Keep the ambient room temperature in between 32° F and 104° F. If the temperature exceeds
104° F or there is a defect in the installation, the air compressor protective devices may stop air
compressor operation and/or damage or reduction in compressor life may occur.

● The air compressor discharges air exhaust from the top. Make sure that there are no items such as
lights, or wirings that are above the air compressor and can be affected by the exhaust air.

● Do not modify the intake or exhaust of the air compressor package, otherwise the temperature may
become unbalanced, resulting in the protective devices of the air compressor to function improperly.

● Do not install ducting on the intake or the exhaust of the Oilfree Scroll Air Compressor, as it may
cause damage to the air compressor.

● Do not install the air compressor in an area above the ground, as the air compressor and/or parts
of the air compressor may fall.

WARNING

● Do not install the air compressor on ground with
insufficient weight load. Do not operate the air
compressor attached to a pallet or packaging table.

● Do not install on any type of rubber other than the
attached rubber vibration isolators and do not bolt to
the concrete. This may result in excessive vibration
and/or damage to the air compressor.

WARNING

SRL-7.5M6LL
SRL-7.5M6ML
SRL-7.5M6L

H

SRL-7.5M6MH

SRL-11M6LL
SRL-11M6ML
SRL-11M6L

H

SRL-11M6MH

SRL-16.5M6LL
SRL-16.5M6ML
SRL-16.5M6L

H

SRL-16.5M6

MH

Generate Heat kJ/h

25,116 36,000 54,000

Cooling Air Flow CFM (㎥/min) 990 (28) 1,240 (35) 1,520 (43)

Cooling Air Differential Temperature
° F (℃ )

63 (35) 63 (35) 63 (35)

Required ventilating capacity (1)
CFM (㎥/min)

2,472 (70) 3,532 (100) 5,297 (150)

Required ventilating capacity (2)
CFM (㎥/min)

777 (22) 1,130 (32) 1,695 (48)

【Please see the table to the below for Reference】

■ Generated Heat ＆ Required Ventilating Capacity Table

The required ventilating capacity value is the required capacity to keep the temperature rise in the room
within 9° F (5℃ ) when only one Oilfree Scroll Air Compressor is operating.

Item

Model

Install the Air Compressor
on Le v el Gro und with a
Sufficient Weight Load.

Rubber vibration
isolators

Exhaust air

Exhaust air

Intake air

Intake air

39 in. or more

1. Ensure that a properly sized air receiver is installed (80 gallons or more). Without a properly sized air
receiver it is possible that the air compressor can be damaged due to excessive starts and stops.

2. Use a textile reinforced, heat resistant rubber hose (hydraulic) of appropriate rating to connect the
Oilfree Scroll Air Compressor to the plant air system piping.

■ It is necessary to install a properly sized air receiver to this compressor in order to reduce excessive
starts and stops.

■ Without a properly sized air receiver, it is possible that the main motor or electromagnetic contactor may
receive unwarranted wear due to excessive starts and stops.

7

● Use a heat resistant, pressure tight rubber hose to connect the Oilfree Scroll Air Compressor to the
plant air system piping. The rubber hose will prevent damage to the plant air system piping due to
vibration.

● Use of an improper rubber hose may lead to cracks and/or leaks due to hose deterioration.

● Do not operate the air compressor when the stop valve between the air receiver and the air
compressor is closed.

● Do not install heavy objects, such as drain traps and filters, to the compressed air discharge as they
may damage the discharge line of the air compressor.

● If a remote vertical air receiver is installed, it is recommended to attach the air receiver to the ground
with foundation bolts.

WARNING

4 Piping the Air Compressor

Safety Relief Valve

● If a stop valve is installed
in the middle of the
compressed air piping,
install a safety relief valve
between the air
compressor and the stop
valve.

Vertical Air Receiver

● To avoid damage to the air
compressor due to excessive
starts and stops, a properly sized
air receiver must be installed.

Hose Fitting

Rubber Hose

● Use an appropriate
rubber hose to connect
with the equipment.

Stop Valve

● Make sure to install a
stop valve between the air
compressor and the air
receiver.

Installation(continued)

● Without a properly sized air receiver, it is possible that a serious accident may occur due to the
unwarranted wear of the main motor or electromagnetic contactor.

● For the protection of the air compressor, if excessive starts and stops occur the compressor will
shut off and display : cycle error [E.CY]. This will stop the supply of compressed air.

● The error message cycle error [E.CY] is an indication that the volume of air receiver is insufficient
for proper operation. An increase in the volume of the air receiver will eliminate the cycle error [E.CY].

WARNING

1. Carry out the electrical work according the local and
national electric codes and standards.

2. Connect the power supply for the main motor through
an earth leakage (ground) circuit breaker between the
main power and the Oilfree Scroll Air Compressor.

3. Wiring capacities are as follows.

1. Internal air compressor wiring has been
completed prior to shipment from the
factory.

2. Remove the front panel, open the door
to the power supply panel and connect
the main power supply cable to the
terminal block.

Installation(continued)

8

● Verify that the power supply for the facility corresponds with the power supply of the air
compressor.

Failure to adhere to this precaution may lead to starting failure, electric motor failure and/or damage to the air
compressor.

● The SRL air compressor should be wired per the local and national electric codes. Improper wiring
may lead to excessive voltage drops.

● Do not use a generator.

CAUTION

5 Wiring the Air Compressor

Connecting the Main Power

Model Power

Wiring Capacity

Minimum Wire Thickness

(mm/AWG)

Minimum Ground Line Wire

Thickness

(mm/AWG)

Circuit Breaker

Capacity

(A)

Fuse

Capacity

(A)

SRL-7.5M6LL
SRL-7.5M6LH

208/230V

3 Phase

60 Hertz

3.9/AWG8 3.9/AWG8 75 75

SRL-11M6LL

SRL-11M6LH

4.9/AWG6 4.9/AWG6 100 100

SRL-16.5M6LL
SRL-16.5M6LH

6.8/AWG4 6.8/AWG4 100 100

SRL-7.5M6ML
SRL-7.5M6MH

460V

3 Phase

60 Hertz

3.9/AWG8 3.9/AWG8 40 40

SRL-11M6ML

SRL-11M6MH

4.9/AWG6 4.9/AWG6 50 50

SRL-16.5M6ML
SRL-16.5M6MH

6.8/AWG4 6.8/AWG4 50 50

Wiring the Air Compressor

Terminal
Block

Main Power
Supply Cable

Ti g h ten th e n u t a f t er
conn e c t i n g th e po w e r
cable.

Note) 1. Use a UL489 listed circuit breaker or UL listed dual-element time delay branch circuit type fuses.

2. The Circuit Breaker and Fuse capacity depend on "UL standard".

Earth Leakage (Ground)
Circuit Breaker

Front panel

3. Make sure to ground the air compressor.

4. For AC208/230V models, the air compressor ships
wired for AC230V, to operate the air compressor at
AC208V, reconnect the wiring of the transformer
primary to the 208V terminal.

5. Turn ON the circuit breakers and motor breakers.

6. Turn on the main power to verify that the voltage
is the specified voltage and phase.

7. Press the start button to verify that the compressor
operates during a trial run. If [E.rE] is indicated on
the digital display, the air compressor is in a reverse
phase condition. To fix the problem, turn off the main
power and reconnect the power after switching two
of three wires of the main power. If nothing has
changed after reconnecting, please refer to P.29.

8. If the air compressor is rotating correctly, the cooling
air flows as shown in the figure to the right.

9

● Make sure to turn off the main power supply before carrying out any wire connections.

● Firmly tighten the screws connecting the main power wiring to the air compressor.
Loose wires may lead to excessive overheating and/or accidents.

CAUTION

Bolts

Terminal Block

Switch two of
the three wires.

Exhaust

Intake

230V

208V

Recon n e c t
the wiring

Do not
reconnect
the wiring

Transformer

Installation(continued)

ON

Ground
Terminal

Circuit Breaker Motor Breaker

The following input and output signals terminal block is equipped in the power supply control panel.

No.

Terminal

Description

Content How to use

①

Customer Control

Run Change-over

Signal

When u ti lizing custom er control ru n,
connect this to the external terminals
of the cu stomer’ s controll er. When
controlled by a customer’s controller,
"b " will be indicat e d on the digital
display. (Only pressure switch control
mode is allowed.)

The input signal is approximately 5VDC, 10mA. Use a switch
or a relay contact with the minimum applicable load of this
value.

②

Remote Operation

Command Signal

Under remote operation, the operation
of t he ai r c ompr e s sor is c ontr o l led
by the input si gnal fro m the remot e
switch. Under customer control run,
the operation of the air compressor is
controlled by the input signal from the
control panel of the customer.

③

Remote Operation

C h a n g e - o v e r

Signal

Before the remote operation of the air
compressor can be used, the operation
switch must be activated. If the mode
of t he air compresso r is changed to
remote operation a change-over signal
wi ll occur . A charac ter “r” (R emot e
mo de) is dis played on t he left mos t
position of the digital display.

When remote control is to be used, the
remote operation change-over signal
must occur before activating the remote
operation command signal.

The input signal is approximately 5VDC, 10mA. Use a switch
or a relay contact with the minimum applicable load of this
value.

Installation(continued)

10

Remote Input and Output Signals

Customer Control Run
Change-over Switch

Inst a l l th e cu s t o m e r co n t r o l ru n
ch a n g e - o v e r sw i t c h near the ai r
compressor.
Sw i t c h ON : Cu s t o mer contr o l l ed
operation is running.
Swi t c h OF F : Lo c al o p e r a t i on i s
running.

① ②

③ ④ ⑤

⑥

# Input Signals Output Signals

# Use shielded wires as input signal wires.

Remote Operation & Stop Switch

Ins tall the remote o pe ration & stop
switch for remote control.
Switch ON : Compressor is running.
S w i t c h OF F : C o m p re s s o r ha s
stopped.

Remote Operation & Stop Switch

Ins tall the remote o pe ration & stop
switch for remote control.
Switch ON : Compressor is running.
S w i t c h OF F : C o m p re s s o r ha s
stopped.

Remote Operation Change-over
Switch

Install the remote operation change­over switch near the air compressor.
Sw i t c h ON : Remo t e opera t i o n is
running.
Swi t c h OF F : Lo c al o p e r a t i on i s
running.