No part of this publication may be reproduced or copied without prior written permission from
Fuji Electric Corp. of America.
All products and company names mentioned in this manual are trademarks or registered
trademarks of their respective holders.
The information contained herein is subject to change without prior notice for improvement.
Preface
This product is designed to drive a three-phase induction motor. Read through this manual to become familiar with proper handling
and correct use.
Improper handling might result in incorrect operation, shorter life cycle, or failure of this product as well as the motor.
Have this manual delivered to the end user of this product. Keep this manual in a safe place until this product is discarded.
Listed below are the other materials related to the use of the FRENIC-MEGA. Read them in conjunction with this manual as
necessary.
• FRENIC-MEGA User's Manual
• RS-485 Communication User's Manual
These materials are subject to change without notice. Be sure to obtain the latest editions for use.
Safety precautions
Read this manual thoroughly before proceeding with installation, connections (wiring), operation, or maintenance and inspection.
Ensure you have sound knowledge of the device and familiarize yourself with all safety information and precautions before
proceeding to operate the inverter.
Safety precautions are classified into the following two categories in this manual.
Failure to heed the information indicated by this symbol may lead to dangerous conditions,
possibly resulting in death or serious bodily injuries.
Failure to heed the information indicated by this symbol may lead to dangerous conditions,
possibly resulting in minor or light bodily injuries and/or substantial property damage.
Failure to heed the information contained under the CAUTION title can also result in serious consequences. These safety
precautions are of utmost importance and must be observed at all times.
Application
• The FRENIC-MEGA is designed to drive a three-phase induction motor. Do not use it for single-phase motors or for other
purposes.
Fire or an accident could occur.
• The FRENIC-MEGA may not be used for a life-support system or other purposes directly related to the human safety.
• Though the FRENIC-MEGA is manufactured under strict quality control, install safety devices for applications where
serious accidents or property damages are foreseen in relation to the failure of it.
An accident could occur.
Installation
• Install the inverter on a base made of metal or other non-flammable material.
Otherwise, a fire could occur.
• Do not place flammable object nearby.
Doing so could cause fire.
• Inverters with a capacity of 50 HP or above, whose protective structure is IP00, involve a possibility that a human body may
touch the live conductors of the main circuit terminal block. Inverters to which an optional DC reactor is connected also
involve the same. Install such inverters in an inaccessible place.
Otherwise, electric shock or injuries could occur.
i
• Do not support the inverter by its front cover during transportation.
Doing so could cause a drop of the inverter and injuries.
• Prevent lint, paper fibers, sawdust, dust, metallic chips, or other foreign materials from getting into the inverter or from
accumulating on the heat sink.
• When changing the positions of the top and bottom mounting bases, use only the specified screws.
Otherwise, a fire or an accident might result.
• Do not install or operate an inverter that is damaged or lacking parts.
Doing so could cause fire, an accident or injuries.
Wiring
• If no zero-phase current (earth leakage current) detective device such as a ground-fault relay is installed in the upstream
power supply line in order to avoid the entire power supply system's shutdown undesirable to factory operation, install a
residual-current-operated protective device (RCD)/earth leakage circuit breaker (ELCB) individually to inverters to break
the individual inverter power supply lines only.
Otherwise, a fire could occur.
• When wiring the inverter to the power source, insert a recommended molded case circuit breaker (MCCB) or
residual-current-operated protective device (RCD)/earth leakage circuit breaker (ELCB) (with overcurrent protection) in the
path of each pair of power lines to inverters. Use the recommended devices within the recommended current capacity.
• Use wires of the specified size.
• Tighten terminals with specified torque.
Otherwise, a fire could occur.
• When there is more than one combination of an inverter and motor, do not use a multiconductor cable for the purpose of
running the leads together.
• Do not connect a surge killer to the inverter's output (secondary) circuit.
Doing so could cause a fire.
• Be sure to connect an optional DC reactor (DCR) when the capacity of the power supply transformer exceeds 500 kVA and
is 10 times or more the inverter rated capacity.
Otherwise, a fire could occur.
• Ground the inverter in compliance with the national or local electric code.
• Be sure to ground the inverter's grounding terminals
G.
Otherwise, an electric shock or a fire could occur.
• Qualified electricians should carry out wiring.
• Be sure to perform wiring after turning the power OFF.
Otherwise, an electric shock could occur.
• Be sure to perform wiring after installing the inverter unit.
Otherwise, an electric shock or injuries could occur.
• Ensure that the number of input phases and the rated voltage of the product match the number of phases and the voltage of
the AC power supply to which the product is to be connected.
Otherwise, a fire or an accident could occur.
• Do not connect the power supply wires to output terminals (U, V, and W).
• When connecting a DC braking resistor (DBR), never connect it to terminals other than terminals P(+) and DB.
Doing so could cause fire or an accident.
• In general, the insulation of the control signal wires are not specifically designed to withstand a high voltage (i.e., reinforced
insulation is not applied). Therefore, if a control signal wire comes into direct contact with a live conductor of the main
circuit, the insulation may break down, which would expose the signal wire to the high voltage of the main circuit. Make
sure that the control signal wires will not come into contact with live conductors of the main circuit.
Doing so could cause an accident or an electric shock.
ii
• Before changing the switches or touching the control circuit terminal symbol plate, turn OFF the power and wait at least
five minutes for inverters of 40 HP or below, or at least ten minutes for inverters of 50 HP or above. Make sure that the
LED monitor and charging lamp are turned OFF. Further, make sure, using a multimeter or a similar instrument, that the DC
link bus voltage between the terminals P(+) and N(-) has dropped to the safe level (+25 VDC or below).
Otherwise, an electric shock could occur.
• The inverter, motor and wiring generate electric noise. This may cause the malfunction of nearby sensors and devices. To
prevent malfunctioning, implement noise control measures.
Otherwise an accident could occur.
Operation
• Be sure to mount the front cover before turning the power ON. Do not remove the cover when the inverter power is ON.
Otherwise, an electric shock could occur.
• Do not operate switches with wet hands.
Doing so could cause electric shock.
• If the auto-reset function has been selected, the inverter may automatically restart and drive the motor depending on the
cause of tripping. Design the machinery or equipment so that human safety is ensured at the time of restarting.
Otherwise, an accident could occur.
• If the stall prevention function (current limiter), automatic deceleration (anti-regenerative control), or overload prevention
control has been selected, the inverter may operate with acceleration/deceleration or frequency different from the
commanded ones. Design the machine so that safety is ensured even in such cases.
• If any of the protective functions have been activated, first remove the cause. Then, after checking that the all run commands
are set to OFF, release the alarm. If the alarm is released while any run commands are set to ON, the inverter may supply the
power to the motor, running the motor.
Otherwise, an accident could occur.
• If you enable the "Restart mode after momentary power failure" (Function code F14 = 3 to 5), then the inverter
automatically restarts running the motor when the power is recovered.
Design the machinery or equipment so that human safety is ensured after restarting.
• If the user configures the function codes wrongly without completely understanding this Instruction Manual and the
FRENIC-MEGA User's Manual, the motor may rotate with a torque or at a speed not permitted for the machine.
An accident or injuries could occur.
• Even if the inverter has interrupted power to the motor, if the voltage is applied to the main circuit input terminals L1/R,
L2/S and L3/T, voltage may be output to inverter output terminals U, V, and W.
• Even if the run command is set to OFF, voltage is output to inverter output terminals U, V, and W if the servo-lock command
is ON.
• Even if the motor is stopped due to DC braking or preliminary excitation, voltage is output to inverter output terminals U, V,
and W.
An electric shock may occur.
• The inverter can easily accept high-speed operation. When changing the speed setting, carefully check the specifications of
motors or equipment beforehand.
Otherwise, injuries could occur.
iii
• Do not touch the heat sink and braking resistor because they become very hot.
Doing so could cause burns.
• The DC brake function of the inverter does not provide any holding mechanism.
Injuries could occur.
• Ensure safety before modifying the function code settings.
Run commands (e.g., "Run forward" FWD), stop commands (e.g., "Coast to a stop" BX), and frequency change commands
can be assigned to digital input terminals. Depending upon the assignment states of those terminals, modifying the function
code setting may cause a sudden motor start or an abrupt change in speed.
• When the inverter is controlled with the digital input signals, switching run or frequency command sources with the related
terminal commands (e.g., SS1, SS2, SS4, SS8, Hz2/Hz1, Hz/PID, IVS, and LE) may cause a sudden motor start or an abrupt
change in speed.
• Ensure safety before modifying customizable logic related function code settings (U codes and related function codes) or
turning ON the "Cancel customizable logic" terminal command CLC. Depending upon the settings, such modification or
cancellation of the customizable logic may change the operation sequence to cause a sudden motor start or an unexpected
motor operation.
An accident or injuries could occur.
Maintenance and inspection, and parts replacement
• Before proceeding to the maintenance/inspection jobs, turn OFF the power and wait at least five minutes for inverters
of 40 HP or below, or at least ten minutes for inverters of 50 HP or above. Make sure that the LED monitor and charging
lamp are turned OFF. Further, make sure, using a multimeter or a similar instrument, that the DC link bus voltage between
the terminals P(+) and N(-) has dropped to the safe level (+25 VDC or below).
Otherwise, an electric shock could occur.
• Maintenance, inspection, and parts replacement should be made only by qualified persons.
• Take off the watch, rings and other metallic objects before starting work.
• Use insulated tools.
Otherwise, an electric shock or injuries could occur.
• Never modify the inverter.
Doing so could cause an electric shock or injuries.
Disposal
• Treat the inverter as an industrial waste when disposing of it.
Otherwise injuries could occur.
GENERAL PRECAUTIONS
Drawings in this manual may be illustrated without covers or safety shields for explanation of detail parts. Restore the covers and
shields in the original state and observe the description in the manual before starting operation.
Icons
The following icons are used throughout this manual.
This icon indicates information which, if not heeded, can result in the inverter not operating to full efficiency, as well as
information concerning incorrect operations and settings which can result in accidents.
This icon indicates information that can prove handy when performing certain settings or operations.
This icon indicates a reference to more detailed information.
iv
Conformity to the Low Voltage Directive in the EU
If installed according to the guidelines given below, inverters marked with CE are considered as compliant with the Low Voltage
Directive 2006/95/EC.
Compliance with European Standards
Adjustable speed electrical power drive systems (PDS).
Part 5-1: Safety requirements. Electrical, thermal and energy. EN61800-5-1: 2007
1. The ground terminal G should always be connected to the ground. Do not use only a residual-current-operated protective
device (RCD)/earth leakage circuit breaker (ELCB)* as the sole method of electric shock protection. Be sure to use ground
wires whose size is greater than power supply lines.
*With overcurrent protection.
2. To prevent the risk of hazardous accidents that could be caused by damage of the inverter, install the specified fuses in the
supply side (primary side) according to the following tables.
- Breaking capacity: Min. 10 kA
- Rated voltage: Min. 500 V
Power
supply
voltage
230 V
Note: A box () in these tables replaces S or H depending on the enclosure.
Note: When using the inverter on single-phase input power also, use fuses suitable
for the inverter type as specified on this page.
Inverter type
FRNF50G1S-2U 10 (IEC60269-2)
FRN001G1S-2U 15 (IEC60269-2)
FRN002G1S-2U 20 (IEC60269-2)
FRN003G1S-2U 30 (IEC60269-2)
FRN005G1S-2U 40 (IEC60269-2)
FRN007G1-2U
FRN010G1-2U
FRN015G1-2U
FRN020G1-2U
FRN025G1-2U 200 (IEC60269-4)
FRN030G1-2U
FRN040G1-2U
FRN050G1-2U 350 (IEC60269-4)
FRN060G1-2U 400 (IEC60269-4)
FRN075G1-2U 450 (IEC60269-4)
FRN100G1-2U
FRN125G1S-2U
FRN150G1S-2U
Fuse rating
(A)
125 (IEC60269-4)
160 (IEC60269-4)
250 (IEC60269-4)
500 (IEC60269-4)
Fuses
Power
supply
voltage
460 V
Inverter type
FRNF50G1S-4U 3 (IEC60269-2)
FRN001G1S-4U 6 (IEC60269-2)
FRN002G1S-4U 10 (IEC60269-2)
FRN003G1S-4U 15 (IEC60269-2)
FRN005G1S-4U 20 (IEC60269-2)
FRN007G1-4U
FRN010G1-4U
FRN015G1-4U
FRN020G1-4U
FRN025G1-4U
FRN030G1-4U
FRN040G1-4U
FRN050G1-4U 250 (IEC60269-4)
FRN060G1-4U
FRN075G1-4U
FRN100G1-4U
FRN125G1S-4U
FRN150G1S-4U
FRN200G1S-4U 400 (IEC60269-4)
FRN250G1S-4U 450 (IEC60269-4)
FRN300G1S-4U 500 (IEC60269-4)
FRN350G1S-4U 550 (IEC60269-4)
FRN450G1S-4U 630 (IEC60269-4)
FRN500G1S-4U
FRN600G1S-4U
FRN700G1S-4U
FRN800G1S-4U
FRN900G1S-4U
FRN1000G1S-4U
Fuse rating
(A)
80 (IEC60269-4)
125 (IEC60269-4)
160 (IEC60269-4)
315 (IEC60269-4)
350 (IEC60269-4)
900 (IEC60269-4)
1250
(IEC60269-4)
2000
(IEC60269-4)
v
Conformity to the Low Voltage Directive in the EU (Continued)
3. When used with the inverter, a molded case circuit breaker (MCCB), residual-current-operated protective device
(RCD)/earth leakage circuit breaker (ELCB) or magnetic contactor (MC) should conform to the EN or IEC standards.
4. When you use a residual-current-operated protective device (RCD)/earth leakage circuit breaker (ELCB) for protection from
electric shock in direct or indirect contact power lines or nodes, be sure to install type B of RCD/ELCB on the input (primary)
of the inverter if the power supply is three-phase 200/400 V.
5. The inverter should be used in an environment that does not exceed Pollution Degree 2 requirements. If the environment
conforms to Pollution Degree 3 or 4, install the inverter in an enclosure of IP54 or higher.
6. Install the inverter, AC or DC reactor, input or output filter in an enclosure with minimum degree of protection of IP2X (Top
surface of enclosure shall be minimum IP4X when it can be easily accessed), to prevent human body from touching directly
to live parts of these equipment.
7. Do not connect any copper wire directly to grounding terminals. Use crimp terminals with tin or equivalent plating to connect
them.
8. Use wires listed in IEC60364-5-52.
Recommended wire size (mm2)
Main circuit
Nominal applied
motor
(HP)
Power supply voltage
Three-
phase
10 5
15 7.5
20
25
230 V
30 15
40 20
50 25
60
75
100
125
150 50
Note: A box () in the above table replaces S or H depending on the enclosure.
*1 The frame size and model of the MCCB or RCD/ELCB (with overcurrent protection) will vary, depending on the power transformer capacity. Refer
to the related technical documentation for details.
*2 The recommended wire size for main circuits is for the 70°C (158°F) 600 V PVC wires used at a surrounding temperature of 40°C (104°F).
LD 6
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD 500
MCCB or
RCD/ELCB *1
Rated current
HD / LD mode
W/
W/o
DCR
DCR
5
10
30 50 4 6 4 4
40 75 6 10 6
50 100 10 16
75 125 16 25 16 25
150 25 35 25
100
175 35 50 35
150 200 50 70 50 70
175 250 70 95 70 95
200 300 95 70×2 95 50×2
250 350 50×295×270×270×2
350 95×295×295×2
400 120×2 120×2120×2
Main power
[L1/R, L2/S, L3/T]
Inverter’s
grounding *3
W/
DCR
10
20
1
-
150×2
input *2
G]
[
DCR
W/o
1
1.5
-
DC reactor
[U, V, W] *2
Inverter outputs
1 1
10
150×2150×2
16
35
[P1, P(+)] *2
Braking resistor
1
1.5
2.5
4
6
10
-
[P(+), DB] *2
0.65
to
0.82
Control circuit
supply [R0, T0]
Aux. control power
-
2.5
2.5
Aux. fan power
supply [R1, T1]
-
vi
Conformity to the Low Voltage Directive in the EU (Continued)
Recommended wire size (mm2)
Main circuit
Nominal applied
motor
(HP)
Inverter type
MCCB or
RCD/ELCB *1
Rated current
Main power
input *2
[L1/R, L2/S, L3/T]
Inverter’s
grounding *3
G]
Power supply voltage
Three-
phase
Single-
phase
0.5 0.25 FRNF50G1S-4U
1 0.5 FRN001G1S-4U
2 1 FRN002G1S-4U
3 1.5 FRN003G1S-4U 15
5 FRN005G1S-4U
FRN007G1-4U
7.5
3
FRN010G1
-4U
10
5 FRN015G1-4U
15
7.5 FRN020G1-4U
20
FRN025G1-4U
25
10
FRN030G1-4U
30 15
FRN040G1-4U
40 20
FRN050G1-4U
50 25
460 V
FRN060G1-4U
60
30
FRN075G1-4U
75
FRN100G1-4U
100 40
FRN125G1S-4U
125
50
FRN150G1S-4U
150
FRN200G1S-4U
200
60
FRN250G1S-4U
250 75
FRN300G1S-4U
300
100
350
Note: A box () in the above table replaces S or H depending on the enclosure.
*1 The frame size and model of the MCCB or RCD/ELCB (with overcurrent protection) will vary, depending on the power transformer capacity. Refer
to the related technical documentation for details.
*2 The recommended wire size for main circuits is for the 70°C (158°F) 600 V PVC wires used at a surrounding temperature of 40°C (104°F).
*3 Grounding terminal can accept one wire only.
FRN350G1S-4U
FRN450G1S-4U HD
HD/MD/LD mode
HD/LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
MD/LD
HD
MD/LD
HD
MD/LD
HD
MD/LD
HD
MD/LD
W/
W/o
DCR
DCR
5 -
5
10
10
20 1.5
15 30
20 40 1.5 4 2.5 2.5
30 50 4 6 4 4
60 10 6 6
40
75
50 100 10
75 16 25 16
125
100
150
125 200 35 70 50 70
175 70 70 95
200 95 95 120
250 50×2150
300 70×2
-
350 185 240 300
500
W/
DCR
1
6
25
300
[
W/o
Inverter outputs
DCR
1
1 1
2.5 1.5 1.5
16 10
35 25
50 35 35
70×2
-
300 120×2
150×2150×2
DC reactor
[U, V, W] *2
[P1, P(+)] *2
Braking resistor
Control circuit
[P(+), DB] *2
supply [R0, T0]
Aux. control power
1
10
16
25
0.65
to
0.82
2.5
1.5
2.5
4
70×2
-
2.5
Aux. fan power
supply [R1, T1]
-
vii
Conformity to the Low Voltage Directive in the EU (Continued)
Nominal applied
motor
(HP)
Power supply voltage
Three-
phase
350 - MD 185×2185×2185×2
450
400
450
500
600
460 V
700
800 250
900 300
1000 400
*1 The frame size and model of the MCCB or RCD/ELCB (with overcurrent protection) will vary, depending on the power transformer capacity. Refer
to the related technical documentation for details.
*2 The recommended wire size for main circuits is for the 70°C (158°F) 600 V PVC wires used at a surrounding temperature of 40°C (104°F).
*3 Grounding terminal can accept one wire only.
Single-
phase
125
-
150
- FRN600G1S-4U MD
150 FRN700G1S-4U HD
200 FRN600G1S-4U LD
- FRN700G1S-4U MD
200
- MD
Inverter type
FRN450G1S-4U
FRN500G1S-4U
FRN600G1S-4U HD
FRN500G1S-4U LD
FRN800G1S-4U HD
FRN700G1S-4U LD
FRN800G1S-4U
FRN900G1S-4U
FRN1000G1S-4U
LD
HD
MD
LD
HD
LD
HD
LD 1600
RCD/ELCB *1
Rated current
HD/MD/LD mode
W/
DCR
600
800
1200
1400
MCCB or
[L1/R, L2/S, L3/T]
W/o
DCR
-
Recommended wire size (mm2)
Main circuit
Main power
input *2
Inverter’s
grounding *3
G]
[
W/
DCR
240×
300×2
240×3240×3300×3
300×3
300×4
W/o
DCR
2
-
Inverter outputs
240×2
300×2
300×3240×4
240×4
300×4
[U, V, W] *2
DC reactor
240×2
300×2
300×4
Control circuit
[P1, P(+)] *2
[P(+), DB] *2
Braking resistor
0.65
-
to
0.82
supply [R0, T0]
Aux. control power
2.52.5
9. When you use an inverter at an altitude of more than 6600 ft (2000 m), you should apply basic insulation for the control
circuits of the inverter. The inverter cannot be used at altitudes of more than 9800 ft (3000 m).
10. The inverter has been tested with IEC61800-5-1 2007 5.2.3.6.3 Short-circuit Current Test under the following conditions.
Short-circuit current in the supply: 10 kA
Maximum 240 V for 200 V series with 40 HP or below
Maximum 230 V for 200 V series with 50 HP or above
Maximum 480 V for 400 V series
11. Connect the inverter to a power system which has a grounded neutral-point. In case of a non-grounded system (ex.
Delta-Delta), the control interface of the inverter is basic insulation, thus do not connect SELV circuit from external
controller directly. See Basic connection diagram (2.3.4).
Aux. fan power
supply [R1, T1]
viii
Conformity with UL standards and CSA standards (cUL-listed for Canada)
UL/cUL-listed inverters are subject to the regulations set forth by the UL standards and CSA standards (cUL-listed for Canada) by
installation within precautions listed below.
1. Solid state motor overload protection (motor protection by electronic thermal overload relay) is provided in each model.
Use function codes F10 to F12 to set the protection level.
2. Use Cu wire only.
3. Use Class 1 wire only for control circuits.
4. Short circuit rating
"Suitable For Use On A Circuit Of Delivering Not More Than 100,000 rms Symmetrical Amperes, 240 Volts Maximum for
230 V class input 40 HP or below, 230 Volts maximum for 230 V class input 50 HP or above when protected by Class J
Fuses or a Circuit Breaker having an interrupting rating not less than 100,000 rms Symmetrical Amperes, 240 Volts
Maximum." Models FRN; rated for 230 V class input.
"Suitable For Use On A Circuit Of Delivering Not More Than 100,000 rms Symmetrical Amperes, 480 Volts Maximum
when protected by Class J Fuses or a Circuit Breaker having an interrupting rating not less than 100,000 rms Symmetrical
Amperes, 480 Volts Maximum." Models FRN; rated for 460 V class input.
"Integral solid state short circuit protection does not provide branch circuit protection. Branch circuit protection must be
provided in accordance with the National Electrical Code and any additional local codes."
5. Field wiring connections must be made by a UL Listed and CSA Certified closed-loop terminal connector sized for the wire
gauge involved. Connector must be fixed using the crimp tool specified by the connector manufacturer.
6. All circuits with terminals L1/R, L2/S, L3/T, R0, T0, R1, T1 must have a common disconnect and be connected to the same
pole of the disconnect if the terminals are connected to the power supply.
7. When using the inverter as a UL Enclosed Type (UL TYPE1), purchase Type 1 kit (option) and mount it on the inverter as
instructed.
ix
Conformity with UL standards and CSA standards (cUL-listed for Canada) (continued)
8. Install UL certified fuses or circuit breaker between the power supply and the inverter, referring to the table below.
Nominal applied
motor
(HP)
Required
torque
lb-in (Nm)
Wire size
AWG ( mm
Main terminal
2
)
L1/R, L2/S, L3/T U, V, W
Inverter type
HD/LD mode
Three-
Power supply voltage
230 V
Note 1: Control circuit terminals Tightening torque: 6.1 lb-in (0.7 Nm), Recommended wire size: AWG 19 or 18 (0.65 to 0.82 mm2)
Note 2: A box (
*1 No terminal end treatment is required for connection.
*2 Use 75°C (167°F) Cu wire only.
*3 The wire size of UL Open Type and Enclosed Type are common. Please contact us if UL Open Type exclusive wire is necessary.
phase
Single-
phase
Class J fuse size (A)
0.5 0.25 FRNF50G1S-2U 105
1 0.5 FRN001G1S-2U 1510
2 1 FRN002G1S-2U 2015
3 1.5 FRN003G1S-2U 3020
HD/
LD
5 FRN005G1S-2U 4030
3
7.5
10 5
15 7.5
20
25
30 15
40 20
FRN007G1-2U
FRN010G1-2U
FRN015G1-2U
FRN020G1-2U
FRN025G1-2U
10
FRN030G1-2U
FRN040G1-2U
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
HD
LD
6050
7575
100 100
150 125
175 150
200 175
250 200
HD
FRN050G1-2U
-2U
LD
350 250
HD
LD
400 300
HD
LD
450
HD
LD
500
HD
LD
600 400
HD
LD 700 500
50 25
60
75
30
100
125
40
150 50
FRN060G1-2U
FRN075G1-2U
FRN100G1
FRN125G1S-2U
FRN150G1S-2U
) in the above table replaces S or H depending on the enclosure.
Circuit breaker trip size (A)
350
Main terminal
Aux. control power supply
10.6
- -
(1.2)
15.9
(1.8)
Aux. Fan power supply
60°C (140°F)
14
(2.1)
10
(5.3)
Cu wire
14
(2.1)
10
(5.3)
Cu wire
75°C (167°F)
*1
Remarks
-
60°C (140°F)
14
(2.1)
12
(3.3)
Cu wire
75°C (167°F)
14
(2.1)
12
(3.3)
Cu wire
*1
8
30.9
(3.5)
(8.4)
-
6
*2
*3
8
(8.4)
-
(13.3)
-
51.3
(5.8)
119.4
(13.5)
238.9
(27)
424.7
(48)
10.6
(1.2)
10.6
(1.2)
3
(26.7)
1
(42.4)
-
4
(21.2)
3
(26.7)
2
(33.6)
2/0
(67.4)
3/0
(85)
4/0
(107.2)
2/0×2
(67.4×2)
3/0×2
(85×2)
4/0×2
(107.2×2)
300×2
(152×2)
-
-
*2
*3
(21.2)
(26.7) 4 (21.2)
(33.6) 3 (26.7)
4
3
2
-
6
(13.3)
2
(33.6)
1
(42.4)
1/0
(53.5)
4/0
(107.2)
3/0×2
(85×2)
4/0×2
(107.2×2)
300×2
(152×2)
-
Remarks
-
*2
*3
-
*2
*3
14
(2.1)
*1
*2
Aux. control power supply
-
14
(2.1)
Aux. fan power supply
x
Conformity with UL standards and CSA standards (cUL-listed for Canada) (continued)
Nominal applied
motor
(HP)
Required
torque
lb-in (Nm)
Wire size
AWG ( mm
2
)
Main terminal
L1/R, L2/S, L3/T U, V, W
Inverter type
Three-
Power supply voltage
460 V
Note 1: Control circuit terminals Tightening torque: 6.1 lb-in (0.7 Nm), Recommended wire size: AWG 19 or 18 (0.65 to 0.82 mm2)
Note 2: A box (
*1 No terminal end treatment is required for connection.
*2 Use 75°C (167°F) Cu wire only.
*3 The wire size of UL Open Type and Enclosed Type are common. Please contact us if UL Open Type exclusive wire is necessary.
) in the above table replaces S or H depending on the enclosure.
LD
HD
LD
HD
HD
HD
HD
HD
250
300 200
350 250
400 300
500 350
600
700
Class J fuse size (A)
Circuit breaker trip size (A)
5
125
200
175
500
Main terminal
Aux. control power supply
10.6
- -
(1.2)
15.9
Aux. Fan power supply
60°C (140°F)
14
(2.1)
Cu wire
75°C (167°F)
14
(2.1)
Cu wire
Remarks
-
60°C (140°F)
14
(2.1)
Cu wire
75°C (167°F)
14
(2.1)
Cu wire
(1.8)
12
(3.3)
30.9
(3.5)
*1
10
(5.3)
-
*2
*3
8
(8.4)
12
(3.3)
10
(5.3)
8
(8.4)
6
-
51.3
(5.8)
119.4
(13.5)
10.6
(1.2)
(13.3)
(21.2)
(26.7)4 (21.2)
(33.6)3 (26.7)
6
(13.3)
4
3
2
2
(33.6)
-
6
(13.3)
4
(21.2)
2
(33.6)
6
(13.3)
2
(33.6)
1/0
(53.5)
-
1/0
(53.5)
238.9
(27)
424.7
(48)
10.6
(1.2)
-
2/0
(67.4)
1/0×2
(53.5×2)
3/0×2
(85×2)
4/0×2
(107.2×2)
250×2
(127×2)
*2
*3
-
4/0
(107.2)
1/0×2
(53.5×2)
2/0×2
(67.4×2)
3/0×2
(85×2)
250×2
(127×2)
300×2
(152×2)
*1
Remarks
-
*2
*3
-
(2.1)
-
*2
*3
Aux. control power supply
14
*1
*2
Aux. fan power supply
-
14
(2.1)
*1
*2
xi
Conformity with UL standards and CSA standards (cUL-listed for Canada) (continued)
Nominal applied
motor
HP
Required torque
lb-in (Nm)
L1/R, L2/S, L3/T
Wire size
AWG ( mm
Main terminal
U, V, W
Inverter type
Three-
Power supply voltage
phase
phase
350 - MD 800
FRN450G1S-4U
450
125
Single-
400
450
500
FRN500G1S-4U
-
FRN600G1S-4U HD
150
FRN500G1S-4U LD
- FRN600G1S-4U MD
150 FRN700G1S-4U HD
460 V
600
700
200 FRN600G1S-4U LD
- FRN700G1S-4U MD
FRN800G1S-4U HD
200
FRN700G1S-4U LD
- MD
FRN800G1S-4U
800 250
FRN900G1S-4U
900 300
1000 400
Note: Control circuit terminals Tightening torque: 6.1 lb-in (0.7 Nm), Recommended wire size: AWG 19 or 18 (0.65 to 0.82 mm2)
*1 No terminal end treatment is required for connection.
*2 Use 75°C (167°F) Cu wire only.
*3 The wire size of UL Open Type and Enclosed Type are common. Please contact us if UL Open Type exclusive wire is necessary.
*4 It is showing the wire size for UL Open Type.
See additional material INR-SI47-1365-JE for UL Enclosed Type (Pack with TYPE1 kit).
FRN1000G1S-4U
HD/MD/LD mode
Class J fuse size (A)
LD
HD
600
1000
MD
800
1200
1200
1400
LD
1600
HD
LD
2000 1400
HD
LD 2200 1600
Circuit breaker trip size (A)
424.7
(48)
Main terminal
Aux. control power supply
10.6
10.6
(1.2)
(1.2)
Aux. Fan power supply
60°C (140°F)
-
Cu wire
300×2
(152×2)
400×2
(203×2)
250×2
(127×2)
300×2
(152×2)
400×2
(203×2)
500×2
(253×2)
600×2
(304×2)
350×3
(177×3)
500×3
(253×3)
600×3
(304×3)
75°C (167°F)
Cu wire
-
*2
*3
*2
*4
Cu wire
Remarks
60°C (140°F)
350×2
(177×2)
400×2
(203×2)
300×2
(152×2)
350×2
(177×2)
400×2
(203×2)
500×2
(253×2)
600×2
(304×2)
400×3
(203×3)
600×3
(304×3)
500×4
(253×4)
2
)
Cu wire
75°C (167°F)
Remarks
Aux. control power supply
Aux. fan power supply
*2
*3
14
14
(2.1)
*1
*2
(2.1)
*1
*2
-
*2
*4
xii
Conformity with UL standards and CSA standards (cUL-listed for Canada) (continued)
When applying single-phase to a three-phase drive, the applied motor must not exceed the specifications in the table below.
Specifications other than those shown below are the same as those in the "Three-phase 230 V series" and "Three-phase 460 V
series."
For precautions for single-phase use, refer to Section 1.3.4.
Single-phase, 200 to 220 V, 50 Hz
Single-phase, 200 to 230 V, 60 Hz
*2 Rated capacity is calculated assuming the rated output voltage as 230 V for 230 V series and 460 V for 460 V series.
*3 Required when a DC reactor (DCR) is used.
xiii
Conformity with UL standards and CSA standards (cUL-listed for Canada) (continued)
(2) Single-phase 460 V series
LD (Low Duty)-mode inverters for light load
Single-phase, 380 to 440 V, 50 Hz
Single-phase, 380 to 480 V, 60 Hz
Voltage: +10 to -10% , Frequency: +5 to -5%
53 63 76 89 108 132 147 182 206 236 265 325 410
*1 US 4P-standard induction motor
*2 Rated capacity is calculated assuming the rated output voltage as 230 V for 230 V series and 460 V for 460 V series.
*3 Required when a DC reactor (DCR) is used.
xiv
Conformity with UL standards and CSA standards (cUL-listed for Canada) (continued)
Standard Model 2 (DCR Built-in Type)
(1) Single-phase 230 V series
LD (Low Duty)-mode inverters for light load
Type (FRN_ _ _ G1H-2U) 007 010 015 020025 030040050060075100
Nominal applied motor (HP)
(Output rating) *1
Item Specifications
3 5 7.5 1010152025303030
Rated capacity (kVA)
*2
Rated current (A) 14 17 24.2 313646.2 59.4759195102
Output ratings
Voltage, frequency Single-phase, 200 to 240 V, 50/60 Hz
Allowable
voltage/frequency
Input ratings
Required capacity
(kVA)
5.0 6.1 8.7 1112162127323436
Single-phase, 200 to 220 V, 50 Hz
Single-phase, 200 to 230 V, 60 Hz
Voltage: +10 to -10%, Frequency: +5 to -5%
4.1 6.6 9.3 12.8 13.2 19.12633394041
HD (High Duty)-mode inverters for heavy load
Type (FRN_ _ _ G1H-2U) 007 010 015 020025 030040050060075100
Nominal applied motor (HP)
(Output rating) *1
Item Specifications
3 3 5 7.510101520253030
Rated capacity (kVA)
*2
5.0 5.0 6.8 9.311141621273234
Rated current (A) 14 14 19 2633394759.4759195
Output ratings
Voltage, frequency Single-phase, 200 to 240 V, 50/60 Hz
Allowable
voltage/frequency
Input ratings
Required capacity
(kVA)
*1 US 4P-standard induction motor
*2 Rated capacity is calculated assuming the rated output voltage as 230 V for 230 V series and 460 V for 460 V series.
Voltage: +10 to -10%, Frequency: +5 to -5%
4.1 4.1 6.8 9.6 13.2 13.4 19.3 27 33 40 40
Single-phase, 200 to 220 V, 50 Hz
Single-phase, 200 to 230 V, 60 Hz
xv
Conformity with UL standards and CSA standards (cUL-listed for Canada) (continued)
(2) Single-phase 460 V series
LD (Low Duty)-mode inverters for light load
Type (FRN_ _ _ G1H-4U) 007 010 015 020025 030040050060075100
Nominal applied motor (HP)
(Output rating) *1
Item Specifications
3 5 7.5 1010152025303040
Rated capacity (kVA)
*2
Rated current (A) 8.5 11 14 1822253239465459
Output ratings
Voltage, frequency Single-phase, 380 to 480 V, 50/60 Hz
Allowable
voltage/frequency
Input ratings
Required capacity
(kVA)
6.7 8.7 11 1417202531364347
Voltage: +10 to -10%, Frequency: +5 to -5%
4.1 6.6 9.3 12.8 13.2 19.1 26 33 39 40 54
HD (High Duty)-mode inverters for heavy load
Type (FRN_ _ _G1H-4U) 007 010 015 020025030 040050060075100
Nominal applied motor (HP)
(Output rating) *1
*1 US 4P-standard induction motor
*2 Rated capacity is calculated assuming the rated output voltage as 230 V for 230 V series and 460 V for 460 V series.
Item Specifications
3 3 5 7.510101520253030
Rated capacity (kVA)
*2
Rated current (A) 8.5 8.5 12 1518232633424959
Output ratings
Voltage, frequency Single-phase, 380 to 480 V, 50/60 Hz
Allowable
voltage/frequency
Input ratings
Required capacity
(kVA)
6.7 6.7 9.5 1114182026333947
Voltage: +10 to -10%, Frequency: +5 to -5%
4.1 4.1 6.8 9.6 13.2 13.5 19.4 27 33 40 41
xvi
Table of Contents
Preface ............................................................................... i
Safety precautions................................................................. i
Conformity to the Low Voltage Directive in the EU................ v
Conformity with UL standards and CSA standards
(cUL-listed for Canada).......................................................... ix
Chapter 1 BEFORE USING THE INVERTER ...................1-1
(1) An inverter and instruction manual (this book) are contained in the package.
The FRN100G1S-2/4U and higher types come with a DC reactor (DCR). Be sure to connect the DCR.
(2) The inverter has not been damaged during transportation—there should be no dents or parts missing.
(3) The inverter is the type you ordered. You can check the type and specifications on the main nameplate. (Main and sub
TYPE: Type of inverter
nameplates are attached to the inverter and are located as shown on the next page.) For inverters of 50 HP or above, the mass
is printed on the main nameplate.
(a) Main Nameplate (b) Sub Nameplate
Figure 1.1 Nameplates
Chap. 1
BEFORE USING THE INVERTER
In tables given in this manual, inverter types are denoted as "FRN_ _ _G1-2U/4U." The box replaces an alphabetic
letter depending on the enclosure.
The FRENIC-MEGA is available in two or three drive modes depending upon the inverter capacity: Low Duty (LD) and High
Duty (HD) modes or Low Duty (LD), Medium Duty (MD) and High Duty (HD) modes. One of these modes should be selected to
match the load property of your system. Specifications in each mode are printed on the main nameplate. For details, see Chapter 8
"SPECIFICATIONS."
Low Duty: LD mode designed for light duty load applications. Overload capability: 120% for 1 min. Continuous ratings =
Inverter ratings
Medium Duty: MD mode designed for medium duty load applications. Overload capability: 150% for 1 min. Continuous ratings
= Inverter rating or one rank lower capacity of inverters
High Duty: HD mode designed for heavy duty load applications. Overload capability: 150% for 1 min, 200% for 3 s.
Continuous ratings = One rank or two ranks lower capacity of inverters
SOURCE: Number of input phases (three-phase: 3PH), input voltage, input frequency, input current (each for LD, MD and
HD modes)
OUTPUT: Number of output phases, rated output voltage, output frequency range,
rated output capacity, rated output current, overload capability (each for LD, MD and HD modes)
SCCR: Short-circuit capacity
WEIGHT: Mass of the inverter in lbs
SER. No.: Product number
If you suspect the product is not working properly or if you have any questions about your product, contact your Fuji Electric
representative.
1-1
1.2 External View and Terminal Blocks
r
c
r
(1) Outside and inside views
Keypad
Warning plate
Front cove
Main nameplate
Cooling fans
(a) e.g. FRN020G1S-4U
Front cover
fixing screw
Wiring guide
Control circuit
terminal block
Front cove
Sub nameplate
Main circuit
terminal block
(b) e.g. FRN020G1H-4U
(c) e.g. FRN450G1S-4U
Figure 1.2 Outside and Inside Views of Inverters
1-2
(2) Warning plates and labels
Warning plate c Warning plate
Chap. 1
BEFORE USING THE INVERTER
Warning label
d
e
Warning label
f
Figure 1.3 Warning Plates and Labels
Warning label f
(on heat sink)
1-3
1.3 Precautions for Using Inverters
1.3.1 Precautions in introducing inverters
This section provides precautions in introducing inverters, e.g. precautions for installation environment, power supply lines,
wiring, and connection to peripheral equipment. Be sure to observe those precautions.
Installation environment
Install the inverter in an environment that satisfies the requirements listed in Table 2.1 in Chapter 2.
Fuji Electric strongly recommends installing inverters in a panel for safety reasons, in particular, when installing the ones whose
enclosure rating is IP00.
When installing the inverter in a place out of the specified environmental requirements, it is necessary to derate the inverter or
consider the panel engineering design suitable for the special environment or the panel installation location. For details, refer to
the Fuji Electric technical information "Engineering Design of Panels" or consult your Fuji Electric representative.
The special environments listed below require using the specially designed panel or considering the panel installation location.
Environments Possible problems Sample measures Applications
Highly concentrated
sulfidizing gas or
other corrosive gases
A lot of conductive
dust or foreign
material (e.g., metal
powders or shavings,
carbon fibers, or
carbon dust)
A lot of fibrous or
paper dust
High humidity or
dew condensation
Vibration or shock
exceeding the
specified level
Fumigation for
export packaging
Corrosive gases cause parts
inside the inverter to corrode,
resulting in an inverter
malfunction.
Entry of conductive dust into
the inverter causes a short
circuit.
Fibrous or paper dust
accumulated on the heat sink
lowers the cooing effect.
Entry of dust into the inverter
causes the electronic circuitry
to malfunction.
In an environment where a
humidifier is used or where
the air conditioner is not
equipped with a dehumidifier,
high humidity or dew
condensation results, which
causes a short-circuiting or
malfunction of electronic
circuitry inside the inverter.
If a large vibration or shock
exceeding the specified level
is applied to the inverter, for
example, due to a carrier
running on seam joints of rails
or blasting at a construction
site, the inverter structure gets
damaged.
Halogen compounds such as
methyl bromide used in
fumigation corrodes some
parts inside the inverter.
Any of the following measures may be
necessary.
- Mount the inverter in a sealed panel
with IP6X or air-purge mechanism.
- Place the panel in a room free from
influence of the gases.
Any of the following measures may be
necessary.
- Mount the inverter in a sealed panel.
- Place the panel in a room free from
influence of the conductive dust.
Any of the following measures may be
necessary.
- Mount the inverter in a sealed panel
that shuts out dust.
- Ensure a maintenance space for
periodical cleaning of the heat sink
in panel engineering design.
- Employ external cooling when
mounting the inverter in a panel for
easy maintenance and perform
periodical maintenance.
- Put a heating module such as a
space heater in the panel.
- Insert shock-absorbing materials
between the mounting base of the
inverter and the panel for safe
mounting.
- When exporting an inverter built in
a panel or equipment, pack them in
a previously fumigated wooden
crate.
- When packing an inverter alone for
export, use a laminated veneer
lumber (LVL).
Paper manufacturing, sewage
disposal, sludge treatment,
tire manufacturing, gypsum
manufacturing, metal
processing, and a particular
process in textile factories.
Wiredrawing machines, metal
processing, extruding
machines, printing presses,
combustors, and industrial
waste treatment.
Textile manufacturing and
paper manufacturing.
Outdoor installation.
Film manufacturing line,
pumps and food processing.
Installation of an inverter
panel on a carrier or
self-propelled machine.
Ventilating fan at a
construction site or a press
machine.
Exporting.
1-4
Storage environment
The storage environment in which the inverter is stored after purchase is different from the operation environment. For details,
refer to the FRENIC-MEGA User's Manual, Chapter 2.
Wiring precautions
(1) Route the wiring of the control circuit terminals as far from the wiring of the main circuit as possible. Otherwise electric noise
may cause malfunctions.
(2) Fix the control circuit wires inside the inverter to keep them away from the live parts of the main circuit (such as the terminal
block of the main circuit).
(3) If more than one motor is to be connected to a single inverter, the wiring length should be the sum of the length of the wires to
the motors.
(4) Drive output terminals (U, V, W)
1) Connect these terminals to a 3-phase motor in the correct phase sequence. If the direction of motor rotation is incorrect,
exchange any two of the U, V, and W phases.
2) Do not connect a power factor correction capacitor or surge absorber to the inverter output.
3) If the cable from the inverter to the motor is very long, a high-frequency current may be generated by stray capacitance
between the cables and result in an overcurrent trip of the inverter, an increase in leakage current, or a reduction in current
indication precision.
When a motor is driven by a PWM-type inverter, the motor terminals may be subject to surge voltage generated by inverter
element switching. If the motor cable (with 460 V series motors, in particular) is particularly long, surge voltage will
deteriorate motor insulation. To prevent this, use the following guidelines:
Inverter 7.5 HP and larger
Motor Insulation Level 1000 V 1300 V 1600 V
460 VAC Input Voltage 66 ft (20 m) 328 ft (100 m) 1312 ft (400 m)*
230 VAC Input Voltage 1312 ft (400 m)* 1312 ft (400 m)* 1312 ft (400 m)*
Inverter 5 HP and smaller
Motor Insulation Level 1000 V 1300 V 1600 V
460 VAC Input Voltage 66 ft (20 m) 165 ft (50 m)* 165 ft (50 m)*
230 VAC Input Voltage 328 ft (100 m)* 328 ft (100 m)* 328 ft (100 m)*
* For this case the cable length is determined by secondary effects and not voltage spiking.
• When a motor protective thermal O/L relay is inserted between the inverter and the motor, the thermal O/L relay
may malfunction (particularly in the 460 V series), even when the cable length is 165 ft (50 m) or less. To correct,
insert a filter or reduce the carrier frequency. (Use function code F26 "Motor sound".)
• For the vector control mode, wiring length is 328 ft (100 m) or less.
(5) When an output circuit filter is inserted in the secondary circuit or the wiring between the inverter and the motor is long, a
voltage loss occurs due to reactance of the filter or wiring so that the insufficient voltage may cause output current oscillation
or a lack of motor output torque. To avoid it, select the constant torque load by setting the function code F37 (Load
Selection/Auto Torque Boost/Auto Energy Saving Operation 1) to "1" and keep the inverter output voltage at a higher level by
configuring H50/H52 (Non-linear V/f Pattern, Frequency) and H51/H53 (Non-linear V/f Pattern, Voltage).
Precautions for connection of peripheral equipment
(1) Phase-advancing capacitors for power factor correction
Do not mount a phase-advancing capacitor for power factor correction in the inverter's input (primary) or output (secondary)
circuit. Mounting it in the input (primary) circuit takes no effect. To correct the inverter power factor, use an optional DC
reactor (DCR). Mounting it in the output (secondary) circuit causes an overcurrent trip, disabling operation.
An overvoltage trip that occurs when the inverter is stopped or running with a light load is assumed to be due to surge current
generated by open/close of phase-advancing capacitors in the power system. An optional DC/AC reactor (DCR/ACR) is
recommended as a measure to be taken at the inverter side.
Input current to an inverter contains a harmonic component that may affect other motors and phase-advancing capacitors on
the same power supply line. If the harmonic component causes any problems, connect an optional DCR/ACR to the inverter.
In some cases, it is necessary to insert a reactor in series with the phase-advancing capacitors.
Chap. 1
BEFORE USING THE INVERTER
1-5
(2) Power supply lines (Application of a DC/AC reactor)
Use an optional DC reactor (DCR) when the capacity of the power supply transformer is 500 kVA or more and is 10 times or
more the inverter rated capacity or when there are thyristor-driven loads. If no DCR is used, the percentage-reactance of the
power supply decreases, and harmonic components and their peak levels increase. These factors may break rectifiers or
capacitors in the converter section of the inverter, or decrease the capacitance of the capacitors.
If the input voltage unbalance rate is 2% to 3%, use an optional AC reactor (ACR).
(%) unbalance Voltage= -
(V)voltageMin - (V) voltageMax
(V) voltage average phase-Three
3)61800 (IEC 67×
(3) DC reactor (DCR) for correcting the inverter input power factor (for suppressing harmonics)
To correct the inverter input power factor (to suppress harmonics), use an optional DCR. Using a DCR increases the reactance
of inverter’s power source so as to decrease harmonic components on the power source lines and correct the power factor of
the inverter.
DCR models Input power factor Remarks
DCR2/4-/A/B Approx. 90% to 95% The last letter identifies the capacitance.
DCR2/4-C Approx. 86% to 90% Exclusively designed for inverters of 50 HP or above.
For selecting DCR models, refer to Chapter 8 "SPECIFICATIONS."
(4) PWM converter for correcting the inverter input power factor
Using a PWM converter (High power-factor, regenerative PWM converter, RHC series) corrects the inverter power factor up
to nearly 100%. When combining an inverter with a PWM converter, disable the main power down detection by setting the
function code H72 to "0." If the main power loss detection is enabled (H72 = 1 by factory default), the inverter interprets the
main power as being shut down, ignoring an entry of a run command.
(5) Molded case circuit breaker (MCCB) or residual-current-operated protective device (RCD)/earth leakage circuit breaker
(ELCB)
Install a recommended MCCB or RCD/ELCB (with overcurrent protection) in the primary circuit of the inverter to protect the
wiring. Since using an MCCB or RCD/ELCB with a lager capacity than recommended ones breaks the protective coordination
of the power supply system, be sure to select recommended ones. Also select ones with short-circuit breaking capacity suitable
for the power source impedance.
- FRN600G1S-4U MD
150 FRN700G1S-4U HD
200 FRN600G1S-4U LD
- FRN700G1S-4U MD
200
- MD
Inverter type
FRN800G1S-4U HD
FRN700G1S-4U LD
FRN800G1S-4U
FRN900G1S-4U
FRN1000G1S-4U
HD/MD/
LD mode
LD
HD
LD
HD
LD 1600
Rated current of
MCCB and
RCD/ELCB (A)
w/ DCR w/o DCR
800
1200
1400
--
If no zero-phase current (earth leakage current) detective device such as a ground-fault relay is installed in the upstream
power supply line in order to avoid the entire power supply system's shutdown undesirable to factory operation, install a
residual-current-operated protective device (RCD)/earth leakage circuit breaker (ELCB) individually to inverters to break
the individual inverter power supply lines only.
Otherwise, a fire could occur.
(6) Magnetic contactor (MC) in the inverter input (primary) circuit
Avoid frequent ON/OFF operation of the magnetic contactor (MC) in the input circuit; otherwise, the inverter failure may
result. If frequent start/stop of the motor is required, use FWD/REV terminal signals or the
/ keys on the inverter's
keypad.
The frequency of the MC's ON/OFF should not be more than once per 30 minutes. To assure 10-year or longer service life of
the inverter, it should not be more than once per hour.
• From the system's safety point of view, it is recommended to employ such a sequence that shuts down the
magnetic contactor (MC) in the inverter input circuit with an alarm output signal ALM issued on inverter's
programmable output terminals. The sequence minimizes the secondary damage even if the inverter breaks.
When the sequence is employed, connecting the MC's primary power line to the inverter's auxiliary control
power input makes it possible to monitor the inverter's alarm status on the keypad.
• The breakdown of a braking unit or misconnection of an external braking resistor may trigger that of the
inverter's internal parts (e.g., charging resistor). To avoid such a breakdown linkage, introduce an MC an
configure a sequence that shuts down the MC if a DC link voltage establishment signal is not issued within three
seconds after the MC is switched on.
For the braking transistor built-in type of inverters, assign a transistor error output signal DBAL on inverter's
programmable output terminals to switch off the MC in the input circuit.
(7) Magnetic contactor (MC) in the inverter output (secondary) circuit
If a magnetic contactor (MC) is inserted in the inverter's output (secondary) circuit for switching the motor to a commercial
power or for any other purposes, it should be switched on and off when both the inverter and motor are completely stopped.
This prevents the contact point from getting rough due to a switching arc of the MC. The MC should not be equipped with any
main circuit surge killer.
Applying a commercial power to the inverter's output circuit breaks the inverter. To avoid it, interlock the MC on the motor's
commercial power line with the one in the inverter output circuit so that they are not switched ON at the same time.
(8) Surge absorber/surge killer
Do not install any surge absorber or surge killer in the inverter's output (secondary) lines.
Chap. 1
BEFORE USING THE INVERTER
1-7
Noise reduction
If noise generated from the inverter affects other devices, or that generated from peripheral equipment causes the inverter to
malfunction, follow the basic measures outlined below.
(1) If noise generated from the inverter affects the other devices through power wires or grounding wires:
- Isolate the grounding terminals of the inverter from those of the other devices.
- Connect a noise filter to the inverter power wires.
- Isolate the power system of the other devices from that of the inverter with an insulated transformer.
- Decrease the inverter's carrier frequency (F26).
(2) If induction or radio noise generated from the inverter affects other devices:
- Isolate the main circuit wires from the control circuit wires and other device wires.
- Put the main circuit wires through a metal conduit pipe, and connect the pipe to the ground near the inverter.
- Install the inverter into the metal panel and connect the whole panel to the ground.
- Connect a noise filter to the inverter's power wires.
- Decrease the inverter's carrier frequency (F26).
(3) When implementing measures against noise generated from peripheral equipment:
- For inverter's control signal wires, use twisted or shielded-twisted wires. When using shielded-twisted wires, connect the
shield of the shielded wires to the common terminals of the control circuit.
- Connect a surge absorber in parallel with magnetic contactor's coils or other solenoids (if any).
Leakage current
A high frequency current component generated by insulated gate bipolar transistors (IGBTs) switching on/off inside the inverter
becomes leakage current through stray capacitance of inverter input and output wires or a motor. If any of the problems listed
below occurs, take an appropriate measure against them.
Problem Measures
An earth leakage circuit
breaker* that is connected
to the input (primary) side
has tripped.
*With overcurrent protection
An external thermal relay
was activated.
1) Decrease the carrier frequency.
2) Make the wires between the inverter and motor shorter.
3) Use an earth leakage circuit breaker with lower sensitivity than the one currently used.
4) Use an earth leakage circuit breaker that features measures against the high frequency
current component (Fuji SG and EG series).
1) Decrease the carrier frequency.
2) Increase the current setting of the thermal relay.
3) Use the electronic thermal overload protection built in the inverter, instead of the
external thermal relay.
Selecting inverter capacity
(1) To drive a general-purpose motor, select an inverter according to the nominal applied motor rating listed in the standard
specifications table. When high starting torque is required or quick acceleration or deceleration is required, select an inverter
with one rank higher capacity than the standard.
(2) Special motors may have larger rated current than general-purpose ones. In such a case, select an inverter that meets the
following condition.
Inverter rated current > Motor rated current
1-8
1.3.2 Precautions in running inverters
Precautions for running inverters to drive motors or motor-driven machinery are described below.
Motor temperature
When an inverter is used to run a general-purpose motor, the motor temperature becomes higher than when it is operated with a
commercial power supply. In the low-speed range, the motor cooling effect will be weakened, so decrease the output torque of the
motor when running the inverter in the low-speed range.
Motor noise
When a general-purpose motor is driven by an inverter, the noise level is higher than that when it is driven by a commercial power
supply. To reduce noise, raise carrier frequency of the inverter. Operation at 60 Hz or higher can also result in higher noise level.
Machine vibration
When an inverter-driven motor is mounted to a machine, resonance may be caused by the natural frequencies of the motor-driven
machinery. Driving a 2-pole motor at 60 Hz or higher may cause abnormal vibration. If it happens, do any of the following:
- Consider the use of a rubber coupling or vibration-proof rubber.
- Use the inverter's jump frequency control feature to skip the resonance frequency zone(s).
- Use the vibration suppression related function codes that may be effective. For details, refer to the description of H80 in
Chapter 5 "FUNCTION CODES."
1.3.3 Precautions in using special motors
When using special motors, note the followings.
Chap. 1
BEFORE USING THE INVERTER
Explosion-proof motors
When driving an explosion-proof motor with an inverter, use a combination of a motor and an inverter that has been approved in
advance.
Submersible motors and pumps
These motors have a larger rated current than general-purpose motors. Select an inverter whose rated output current is greater than
that of the motor. These motors differ from general-purpose motors in thermal characteristics. Decrease the thermal time constant
of the electronic thermal overload protection to match the motor rating.
Brake motors
For motors equipped with parallel-connected brakes, their power supply for braking must be supplied from the inverter input
(primary) circuit. If the power supply for braking is mistakenly connected to the inverter's output (secondary) circuit, the brake
may not work when the inverter output is shut down. Do not use inverters for driving motors equipped with series-connected
brakes.
Geared motors
If the power transmission mechanism uses an oil-lubricated gearbox or speed changer/reducer, then continuous operation at low
speed may cause poor lubrication. Avoid such operation.
Synchronous motors
It is necessary to take special measures suitable for this motor type. Contact your Fuji Electric representative for details.
Single-phase motors
Single-phase motors are not suitable for inverter-driven variable speed operation.
High-speed motors
If the reference frequency is set to 120 Hz or higher to drive a high-speed motor, test-run the combination of the inverter and
motor beforehand to check it for the safe operation.
1-9
1.3.4 Precautions for use on single-phase power
An inverter is a device that converts alternating current of the input line to direct current via the ac-to-dc rectifier and then
converts it to alternating current via the dc-to-ac switching inverter circuit in order to output the required alternating current. The
FRENIC-MEGA is designed to connect to the three-phase power and this manual stipulates the specifications for the use on the
three-phase power.
If the inverter designed for connection to three-phase power runs on single-phase power, ripples (voltage fluctuation) on the DC
link bus voltage rectified from the input power become larger than those in the inverter running on three-phase power. The
DC-voltage ripple affects the inverter output; that is, ripples could be superimposed on the output voltage or current, making
control hard.
Accordingly, the inverter may not work in full performance or function correctly. To use the FRENIC-MEGA on single-phase
power, therefore, you need to take the following into account.
Output current
Select the inverter capacity to keep the output current within the specified level, referring to pages xx to xxiii. Output current
exceeding the limit extremely increases voltage ripples on the DC link bus, impeding normal operation or resulting in an inverter
breakdown.
Wiring
When connecting 230 V inverters of 60 HP or above or 460 V ones of 125 HP or above to single-phase power, use L1 and L3
phases since cooling fans and magnetic contactors inside the inverter are supplied with power via L1 and L3. Using L2 does not
work cooling fans or magnetic contactors, causing abnormal heat, in the worst case, resulting in an inverter breakdown.
Connecting peripheral devices
For the specifications of circuit breakers and fuses to apply, refer to pages x to xii and for those of MCCB or RCD/ELCB, pages
1-6 and 1-7.
Configuring function codes
(1) Cancel the input phase loss protection of the protection/maintenance function with function code H98 (Bit 1 = 0). This is
because the inverter judges single-phase power as a phase loss.
(2) Do not use the inverter in the MD mode. Limit the drive mode to the LD/HD mode (Function code F80 = 0 or 1).
(3) Do not use "Vector control without speed sensor" or torque control. (Function codes F42 ≠ 5, H18 = 0)
(4) "V/f control with slip compensation inactive" is recommended (F42 = 0).
Any other drive control calculates the motor model using the motor parameters inside the inverter. As ripples on the DC link
bus voltage become larger, therefore, calculation causes some errors so that the inverter may not provide the desired
performance. Consider this problem before use.
In particular, when using "Vector control with speed sensor" (F42 = 6), dancer control (J01 = 3), or brake signals (J68, J69,
J70, etc.), assure the operation and safety of those speed sensors.
1-10
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