Mitsubishi Electric FR-K-400-U User manual

MlTSUBlSHl
VVVF TRANSISTOR INVERTER
-INSTRUCTION MANUAL-
( 208/230V series I
MlTSUBlSHl
ELECTRIC

FORWORD
Thank youforyour purchaseof MitsubishiMulti-PurposeInverter FREQR0L.K .
This is a variable frequency power supply unit to control the speed of squirrel-cageinduction motors . This in-
struction manual is intendedboth toexplainthe unitand to outline operation procedures
.
This unit is not difficult to operate. but incorrect operation may lead to some troubles. so read this instruction
manual carefully before operation
. Ifyou use to unitproperly. we are sure it will give you many years of satisfac-
tion
.
Please make sure toattach this instruction manual tothe unitwhen the unit is shipped .
CONTENTS
1 . UNPACKING 1
2 . TRANSPORTING 1
.........................................................
3 . INSTALLATION 1
4
. WIRING AND POWER SUPPLY RATING ........................................ 1
............................................................
4-1 Wiring 1
4-2 Power supply rating
................................................... 2
........................................................... . 5 OPERATIONS 4
..........................................
5-1 Pointstocheck before operations 4
5-2 Preparationsbefore operations
............................................ 4
.........................................................
5-3 Operations 5
................................................. 5-4 Operation's precautions 6
6
. MAINTENANCEAND INSPECTION ............................................ 7
7 . CONSTRUCTION AND ARRANGEMENTOF CONTROLLER PARTS ..................... 8
8
. TROUBLESHOOTINGAND COUNTERMEASURE .................................. 9
8-1 Troubleshootingchart .................................................. 9
8-2 Failures indicatedby lighting of alarm indication lampsand how to deal with them
.........
13
.............................................
8-3 Measuringvoltage and current 15
9 . STANDARDSPECIFICATIONS ............................................... 17
10. PROTECTIVEFUNCTIONS .................................................. 18
. 11 INPUT/OUTPUTTERMINAL ................................................. 19

1. UNPACKING
After unpacking your FREQROL-K, first check the following points.
0 Refertothe name plate toconfirm thatthe model and the output rating is indeed the one you ordered.
(Seetable
1)
0 Check where there has been any damage or breakagetothe FREQROL-Kduring transportation.
If you have any doubts about the above, or find any damage to the unit, please contact your local service
representative.
Table
1 FR-KSeries Configuration
Motor output (HP) 112
1 2 3 5 7.5 10
Without operation FR-K- FR-K- FR-K- FR-K- FR-K- FR-K- FR-K-
panel 400-U 750-U 1500-U 2200-U 3700-U 5.5K-U 7.5K-U
With operation FR-K- FR-K- FR-K- FR-K- FR-K- FR-K- FR-K-
panel 400M-U 750M-U 1500M-U 2200M-U 3700M-U 5.5KM-U 7.5KM-U
Note: The operation panel is provided with a frequency setter, a frequency meter and a FWDIREV starting
switch.
2. TRANSPORTING
When transporting the FREQROL-K, handle it gently to prevent damage. There are depressions on boththe
top and the bottomwhere the unitcan be grasped, and these should be held when
it is moved.
Do not apply too much force to the fan at the bottom of the unit. The unit is covered with a plastic case,
and care should be taken notto apply force only tothis cover during transport.
a
3. INSTALLATION
o Place the inverter in a clean and well ventilated location. Avoid locations exposed to direct sunlight, or
subject to high temperatures, humidity, dust or corrosive gases.
0 Install the inverter securely on the wall with volts or screws, vertically so that the letters "FREQROL-K"
appears front.
0 Since the inverter does generate some heat during operations, any other equipment or parts should be
installed at least 10cm away from up and the bottom toprevent heat confined.
The brake resistor attached tothe rear of the unitalso generates heat, so the unitshould notbe placed on
awall with lowheat resistance.
0 If your inverter is one equipped with an operation panel, take care to put it in a place where it can be
easily operated.
4. WIRING AND POWER SUPPLY RATING
4-1 Wiring
Connect wiring correctly according to following instructions and refer to Fig. 1, Standard Wiring
Diagram.
Fowwiring of the peripheral devices such as MCCB, refer toTable
2, Selection of Peripherals.
(1) When the wiring cover located at the bottom of the inverter is pushed inward and then pulled
toward the operator, the wiring cover alone
is removed thus exposing all terminal blocks. A
corrugated gripping surface has been provided for your convenience. Nowperformwiring.

(2) The wirings of the frequency setter, FWDIREV start switches, frequency meter and calibration
resistor of meter equippedwith an operationpanel inFig. 1have already connected.
(3) Do not wire the power cable in such a manner that the line source voltage is directly applied to
the outputterminals
U, V and W.
(4) It is notalways necessav to provide wiring to the reset switch, since the circuit can be restored
by cutting off
MCCB or Magnetic Contactor (MS) if the output protective circuit has been
activatedtostop the controller.
(5) Since terminals P and N have been provided for brake unit and discharge resistor connections,
avoidconnectingonly discharge resistor, or any other equipment, tothese terminals.
(6)
It is notnecessary toconsider the phase sequence whenconnectingtoterminals R, Sand T.
(7) Since the frequency settingsignal current is extremely low if it is necessary touse contacts inthe
frequency setting circuit, use two pairs of parallel contacts or twin contacts for extremely low
currenttopreventpoor contact.
(8) Use
shielded wires or twisted wires as the wire cable in connections to the control terminals
(terminals marked as in Fig. 1, Standard Wiring Diagram) to preventthe control circuit from
being induced by other equipment, and also connect them away from the main circuit and high
voltage circuit (Relaysequence circuitof 230V. 115V).
Twisted wire .~. Shieldedwire
Frequency setter Frequency setter
(9) The output wires from the inverter are protected from short-circuiting (i.e., short-circuiting
among terminals
U, V and W) by an overcurrent protective circuit. However, there is no pro-
tection against shortcircuit caused by accidental leakage such as grounding. Therefore, care
should be taken to position the wires so as topreventthem from makingcontactwith the chassis,
etc.
(10)Rotation direction of the motor is counterclockwise as seen from the load side with the normal
wiring tothe output terminals
U, V and W.
4-2 Power supply rating
The FREQROL-K is shipped by the standard power supply ratingof AC 230V 60Hz. Ifyou are going
to install the FREQROL-Kwhere the power supply
is AC 208V 60Hz, change the connectionfor the
transformerTIas shown below.
In this case, take care tocheck the box on the front cover which indicates that the powersupply rating
has beenchanged.
Transformer T1
Change form 230V to 208V
or vice verra.
the terminal black
R1 and T1

Table 2 Selection of Peripherals
Model Current Ratings
/ of MCCR ad MS / Wires R, S. T I Wires U, V, w I
F R-K400-U
F R-K-7504
F R-K-1500-U
Note: 1. A wire size of #19 AWG or more is adequate all circuits other than the main circuit.
2. Select MCCB and MSaccording topower supply capacity.
3. Ifwiring distance exceeds 30 meters, increase wire size.
FR-K-2200-U
FR-K-3700-U
FR-K-5.5K-U
FR-K-7.5K-U
Fig. 1 StandardWiring Diagram
5A mps
10A mps
15A m~s
NFB
IMCCBI MS 1'21
/L 9
20A mps
30A mps
50A mps
60A mps
Calibratiot
Frequency meter
moving coiltype
113~ 10 k
1 mA
(Hz indication]
#14 AWG
#I 4 AWG
#14 AWG
Frequency setter
2W 1 kSL
#14 AWG
#14 AWG
#14 AWG
#14 AWG
#I 2 AWG
#lo AWG
# 6 AWG
- -
1 OCR ('11 Motor
#14 AWG
#12 AWG
#I0 AWG
# 8 AWG
FREOROL-K
Inverter
I
STF Reret aw.
STR
SD SD
FM
are built into inverters
an operation panel.
NOTE:
1. If you are running a motor with
a different capacity from the
inverter,
or more than one motor.
~rovidethermal overload relay to
the inverter's output circuit.
2. The purpores of this MS
as
follows,
11 If the nsrt switch is held
meCnanlCB
v, tne nverter w I
restart a.tomat'ca v nnon the
mner I.OD~Y I am e0 after
.. . . .
the momentary power inter-
ruption. For application when
auto.restart must be avoided.
this MS must be inrtalled.
21 In the
case the inverter must
be restarted until the motor
has sopped coasting,
or the
output transinor might be
damaged.

5. OPERATIONS
5-1 Points to check beforeoperations
After installation and wiring of FREQROL-K
is completed, check the following points before opera-
ting.
If insulation
is tobe checkedwith amegger, perform only the test betweencontroller and grounding.
Never performa megger testbetweenthe inverter's terminals.
Alsodonotperform amegger tenonthe control circuit terminals.
Refer tosection
6 for details on megger insulationtests.
(1) Check whether wiring conforms tothe standardwiring diagram.
(2) Check for pointsshort-circuitedby brokenwire, etc.
(3) Check ifany wire is strained.
(4) Check tightness of screws, of terminalsand other fasteners.
(5) Check motor loadconditions.
5-2 Preparations before operations
When inspection is completed, open the setting panel flap on the inverter front panel and make the
following setting.
5-2-1 Selectionof maximumoutputfrequency (setwith connector)
By changingthe position of the connector on the P.C. board,
set the maximumoutput frequency.
The maximum outputfrequency
is set to60Hz at shipping. (Don't change the connector while inverter
is operating)
1. 60Hz
(At shipping)
Note: If you are using ageneral-type motor, do not set the maximum output frequency to 240Hz.
(Thissetting
is for specialdesignedmotors.)
5-2-2 Selectionof frequency settingsignal (setwith sleect switch)
The settings O-5V and 0-10V are available for frequency signal. The 0-5V position is set at shipping. If
another settingis required, select as follows:
(1) For 0-5V DCsignal:
set the selectswitchtothe down position. (atshipping)
(2) For0-10V DCsignal: set the select switch tothe up position.
5-2-3 Settingof accelerationldeceleration time (setwith ACCE LIDECEL dialsand select switches)
Set acceleration and deceleration times by settingthe ACCEL and DECEL dials and the accelera-
tion anddecelerationtime magnifyingselectswitches.
(1) Acceleration and deceleration times can be
set independantly.
(2) Acceleration and deceleration time refers to the time during which output frequency is
increasingfrom 0 tomaximumfrequency or decreasing from maximum frequency to0.
(3) The relationship betweenthe figures on the notches of the ACCEL and DECELdials and the
position of the accelerat~onand deceleration time magnifying select switch
is shown inthe
figure below. Set them
at positions appropriate according to applications and kinds of the
motor load.

10 -150 rec.
110 secor~ds increment) 0.2
-3 sec.
10.2 second increment1
(4) Both the acceleration and deceleration times are set at 5 seconds at shipping.
5-2-4 Sening of electronic thermal relay (setbysetting dial)
(1) For setting of the electronic thermal relay, the rated output current of the inverter is deter-
mined at 100%. (Thesetting range
is 50 to loo%.)
(2) The electronic thermal relay is
set at 100%at shipping.
(3) Set the setting dial for the electronic thermal relay by calculating the percentageaccording
tothe followingequation.
0 When s single motor is operated by the inverter, the followingequation applies:
Rated current of the motor (A)
Set scale
(%) = -
x 100
Rated output currentof the inverter (A)
Ifthe value of the
set scale (%) exceeds 100%. then set the setting dial to 100%.
Rated outputcurrent
is shown inthe name plate.
(4) If a multipole motor with eight or more poles, an special-purpose motor, or plural motors
are being operated, the built-inelectronic thermal relay will notaffort sufficient protection
so athermal overload relay should be added tothe inverter's output circuit.
If such cases turn the electronic thermal relay setting dial
(TH) as far as it will go inthe
clockwise direction.
5-3 Operations
When the preparations have been completed, begin inverter operations in the following procedure:
(1) First close the
MCCB, then the magnetic contactor (MS) by pushbutton. The power pilot lamp
on the inverter panel should light in yellow. The motor will notyet rotate in this state. Touch the
motorwith your hand tosee that there are no buzzing sounds or vibration.
(2) If there are no zbnormalities, turn the FWD start switch (or REV start switch) on. Gradually turn
the knob of frequency setter clockwise. When the knob is turned to "3Hz" position, the motor
will start rotating. And turned farther clockwise, the frequency (rotation of the motor) will in-
crease gradually ap to
its maximum frequency setting (60Hz. 120Hz or 240Hz)
(3) When the frequency setter has been
set at the desired frequency, and the FWD start switch (or
REV start switch) has been turned on, motor revolutions will increase to the set value within the
time
set by the acceleration time setting dial described above, and then continue tooperate at the
setting frequency. If the motor does not acceleratesmoothly and the ALARM lamp blinks during
the acceieration or the "ALARM" indication lamp lights up, this is because the acceleration time
has been
set at too short period in relation to the motor load, and the acceleration time should
thus be lengthened.

(4) When the FWD start switch (or REV start switch) is turnedoff while the motor is rotating, motor
speed is decelerated in the time'period set by the DECEL dial. When the frequency falls below
3Hz. the DC dynamic brake will be activated and the motor will stop immediately. If the motor
speed does not decelerate smoothly and the ALARM lamp blinks during the deceleration or the
"ALARM" indication lamp lights up, this is because the deceleration time
is notsufficient for the
motor load, and the decelerationtime shouldthus be lengthened.
(5) Ifthe FWD start switch and the REV start switch are turned on simultaneously, the motorwill not
rotate. Also, if the FWD start switch and the REV start switch are simultaneouslyactivatedwhile
the motor
is rotating, the motor will begin decelerating inthe same manneras when the FWD (or
REV)start switch
is turned off.
(6) If the FWD start switch is turned off and the REV start switch turned on while the motor is rotat-
ing forward, the motor speed will decelerate toa frequency of 3Hz. at which point the rotation
direction will automatically be reversed, accelerating gradually tothe frequency that has beenset.
Thesame is also true of movementfrom reverse toforward rotation.
(7) Ifthe settings of the acceleration or deceleration times are changed during motor operations, the
previous settings will remain in memory and the changes will not take effect. Note that this
unit
is designed for changes in the setting of accelerationand deceleration time to be made at a
inverterfrequency below3Hz.
(8) If the protective circuits, such as those against overcurrent and regenerative overvoltage are
activated, the alarm indication lamp will light up in red and the shut-off state will continue. To
reset
after ashut-off, performthe followingoperations:
0 First turn off the power supply with the MCCB or the Magnetic contactor (MS), then turn
it on.
0 Short-circuit the terminals between RES (reset)and SD (common)of the control circuit by the
reset switch, then (after about 0.1 second), re-open.
(9) Use the calibration resistor to adjust the frequency meter so that the frequency is indicatedas 60,
120 or 240Hz when the commanded voltage (across terminals between 2 and 5)
is set to 5V DC
or 10V DC by the frequency settinginputsignal select switch.
Inverters equipped with a frequency meter have already been adjusted at the factory before
shipping.
(10) When the DC dynamic brake activates at below 3Hz during deceleration,
it may cause a high-
pitched noise. This noise is common, and does not indicate any abnormalities (The DC dynamic
brakefunctionsfor about0.5 second.)
5.4 Operation's Precautions
When the confirmations described above have been completed you may begin normaloperations, but
keep thefollowing points in mind when doingso.
(1) When a general type motor is being driven by the inverter, the temperature, noise and vibrations
will be somewhat higherthan they would be with acommercial power supply.
(2) Since cooling efficiency decreases at low speed operations,
it is necessary to reduce the torque
from the rated motor torque. (Refertothe catalogfor the torque reduction ratio.)
(3) The FREQROL-K is capable of controlling plural motors at the same time. When the inverter is
used to control more than one motor, care shouldbe taken that the total current requirementfor
thesimultaneouslyoperatedmotors
is within the rated output current of the inverter.
(4) Ifthe FREQROL-K
is being used to control multipole motors with 8 or more poles, submersible
motors. or other special-purpose motors, carefully examine the rated current and other electrical
specification.

(5) Do not add a capacitor nor surge absorber to the outputcircuit of the inverter. This may activate
the overcurrent protection.
(6) If you are using a motor with mechanical brakes, the brake exciting circuit should not be con-
nected to the inverter output, and make certain theat brake action can be affected after turning
off the inverter's power supply.
(7) If using motors of different capacity or special-purposemotors, or ifmorethan one motor is being
used simultaneously, add
a thermal overload relay to the inverter output circuit to protect the
motor from being burned up. In this case turn the electronic thermal relay setting dial (TH) on
the operation panel as far as
it will go inthe clockwise direction.
(8) Th= FR-K-400 can also be used with a single phase power supply, but when doing so be sure to
connect the power supply toterminals R and
S.
(9) Since the built-in brake resistor will cause temperature increases, mount it on noninflammable
materials such as metal or concrete.
6. MAINTENANCE AND INSPECTION
The FREQROL-K is the static type, so almost no daily maintenance is required. The following maintenance
practices should, however, be observed.
(1) Since the capacitor inthe inverter remains chargedat high voltage for awhile after the inverter isturned
off, perform inspections only after charge indication lamp "CHARGE" goes out. Also, the coolingfan
will continueto runfor some time after the power has beenturned off, so be careful to keep hands away
from this area.
(2) From time totime, inspect the inverter for dust and dirt accumulated inside, and clean it if there is a
buildup.
(3) Check the tightness of terminal block screws and mounting screws. If they come any loose, tighten
them securely. Make certain there are no defects in the wiring parts or components. Replace defective
wiring part if found, or contact your service representative.
(4) Meggertest
a) When performing a megger test on the external equipment, remove all inverter terminals so thatthe
test voltage will not be applied tothe inverter.
b) Perform megger tests only for the main circuit of the inverter as shown in Fig.
2. Do not apply the
test voltage tothe control circuit.
c) TOcheck the FFiEQROL-K control circuit, use a multimeter (settohigh resistance range position).
Do notuse a megger or buzzer.
Fig.
2 Megger Test
-
Earth terminal

7. CONSTRUCTION AND ARRANGEMENT OF INVERTER PARTS
I
As noted above, wiring requires only the removal of the wiring cover at the bottom of the inverter. To
inspect the inverter's interior, however, proceedas follows:
(1) When the wiring cover is removed, the plastic cover's two set screws will be exposed. Remove these
screws and slidethe plastic cover upward.
(2) The P.C. board of the control circuit has been attached by set screws (for inverters below class FR-K-
3700-U)or the board support (for FR-K-5.5K-U and FR-K-7.5K-U).
Fig.
3 Type FR-K-400-U to FR-K-3700-U Fig.
4 Type FR-K-5.5K-U and FR-K-7.5K-U
Controlcircuit terminal arrangement
TR?
Control circuit terminal arrangement
TB4

8. TROUBLESHOOTING AND COUNTERMEASURE
In the unlikely event that there should,be problems with the inverter or its should lose any of its functions,
use the troubleshooting chart below to identify the cause and apply the appropriate countermeasure. If your
problem
is notdescribed below, the inverter is out of order, one of the parts has been damaged or if you have
any other problem not dealt with here, contact with your local service representation.
8-1 Troubleshooting Chart
(1) Motor does notrun
START
ii
Note 1.
power supply has been
Are MCCB (ELB), MS.
Yes
terminals R and S, S etc. turned
on?
Defective MCCB (ELBI or
and T.T and S.
MS, or wiring trouble
lamp lit
up?
pacity transformer?
Inverter trouble
Cooling fan trouble
tion relay of radiation Ventilation obstruction fan. Remove
Set reret rwitch lbetweenterminals
Is reset switch "ON"? RES and SD) to
"OFF"
1s voltage across termi-
t yes .(
Defective reret switch
nals RES
and SD below Transistor falls tofunction when energized.
14V?
L No
lcont'd on next right page1

(cont'd from leftpagel
I No
I
Are terminalsSTF and Either STF or STR should
be
STR both ON? continuity; not both.
J, No
1s voltage acrosstermi-
nalsSTF lor STRI and Poor start switchcontact
SD greater than 1V7
,
Transistorfsilr tofunctionwhen energized.
Has voltage beenapplied
P
tomotor terminals U
Has voltagebeen applied Yes
andV, V and
W, and W
> to frequency command Invertertrouble
,and
U? J terminals 2and5?
I
v
Is voltage across termi- %,- I
nalr 5 and 10 5V (or
trouble or wiring
trouble
Motor overload Motor trouble
Magneticbrakedoes not open.
. Motor trouble Note
0: ELL3 = Earth Leakage Braker
Wiring trouble Note 1: Out of voltage should
be within f 10% of ratedvoltage.
Note
2: Is thermal overload relay IOCRIconnected.
Note
3: Imbalancedshould bewithin 1% of maximumoutput voltage.
Note
3.
Is three-phasevoltage
outof balance?
I
Yes
>
Isvoltage still unbalan-
ced after disconnecting Invertertrouble
motorterminals.

(2) Motor buzzes and does not run.
Note 4.
A
Does frequency meter fail
to change
even though
frequency setter has been
turned to increase?
Is output voltage
across
terminals U and V. V
and W, and Wand U
Inverter trouble
out
of balance?
Overload
causer activation Increaseinverter capacity
of protectionagainat stalls. and motor capacity.
Motor trouble Note
4: Examine this with motor disconnected
(3) Motor runs at constant speed and cannot be controlled.
/-,
OV to 5~ lor from 1~ to Frequency
rener trouble
10Vl across terminals 2
and 5 even after freque-
ncy setter has been tur-
ned
on?
No Inverter trouble
(4) Motoroverheats.
u
Ir motor overloaded?
Yes
Lighten the load or increasecapacity of motor and
No
Does motor run at low
speeds for long periods Lighten the load
or ventilate themotorfrom
of time?
or increasecapacity of motor and inverter.
& Note. 6
I I
IS output voltage among
terminals
U and V, V
and W, Wand U out Of Inverter trouble
balance?
Is there any obstruction
to motor cooling? Remove obstruction.
Inverter trouble Note
5: Overload should be below 110% of motor rated current l60Hz. 220V ACI.
Note 6: Proper balance is not more 1% of maximum output voltage.

(5) Motor does not run smoothly
Note
7.
Does problem occur Isaccelerationldecele- ngthen acceleration1
during acceleration/ rationtime
too short? decelerationtime.
deceleration?
I
Does output voltage
fluctuctuate?
Load
4 tooheavy.
Increase capacity of
motorandinverter.
\L
Is voltage out of balance
amaung terminals
U and yes
V, V and W. W and U?
NO
Har there been
a load Yes Minimize loadvariation
or attach flywheel tomotor.
vibration?
Run with loadvaciation.
Isthere any backlash in
chain, gear. etc.? Improve mechanical parts.
No
Capacitor
for constant
Has inverter been
used
output voltage hasbeen
for 5t0 10 years?
used beyond service life.
Inverter trouble
Note
7: Anivatlon of protecttonfunction against stalls causes unstable acceleratianldeceleratian

8-2 Failures Indicated by Lighting of Alarm Indication Lamps and How to Deal with Them
The protective functions can be activated by various conditions, as shown below. If an alarm indication
lamp lights up,
it is important to keep your head and examine the cause of the problem, and then to
apply the appropriate countermeasure.
Alarm
Uarm
ndication
amp "ON'
Cause
Acceleration time
is too
short.
Inverter's output circuit
is
turned on and off.
Peak load reached
nstan-ianeously.
Load
is too heavy
Built-inbrake is being
lsed too frequently.
-.
:Ither acapacitor for
lower factor improvement
lra capacitor for surge
jbsorber has been inserted
3t inverter's output circuit.
jhort-circuitor ground
'ault inthe output circuit
)f the inverter.
Motor
is turned on again
luring free running (runnin
sf inertia force after power
ias been turned off).
Description
Check whether the magneti
contactor has been turned
on after the inverter start
signal (ST)went ON.
Even after acceleration timt
has been lengthened, motor
hardly runs before the alarn
indication lamp lights up.
(Theelectronic thermal
relay has been activated dut
tooverload or overheating
caused by low speed opera-
tions, thus turning alarm
indication lamp on.)
Deceleration may be done
inseveral stages. If the
maximum number all~wabl~
is exceeded, however, this
will increasethe frequency
of use of the brake, and an
alarm indication lamp will
come on.
There is an overcurrent
because impedence of
capacitor is small against
high frequency.
Ground faults do not alway
cause an overcurrent trip
(OCT)state. If aground
fault occurs, it may lead to
inverter trouble.
Since inverter starts opera-
tion at
3H2, motor runs by
regenerativeoperation,
which generates overcurreni
Countermeasure
Lengthen acceleration1
deceleration time.
Correct sequence if wrong.
If
it is necessary to turn on
and off of inverter's output
circuit, increasethe capacit
of inverter by five times or
more.
Adjust machine so that
peak load
is notreached.
Increasecapacity of in-
verter by
1 or 2 class.
Since static friction torque
is larger than the torque of
motors under
3Hz at start-
up, increase capacity of
motor and inverter. Lighter
the load or change opera-
tions partern.
Either lengthen the decel-
eration time or lessen its
frequency. Add an exter-
nal brake unit.
Remove them. If they
have been factory-set, care
should be taken not to
forget to removethem.
It is recommended to
insert a reactor into the
input circuit in order to
improve the power factor.
Locate the short-circuited
pointsand apply the ap-
propriate countermeasure.
Restart the motor only
after
it has stopped com-
pletely.
Inautomatic operation, use
atimer to start the motor
after
it has stopped com-
pletely.

Alarm
Alarm
indication
lamp "ON"
Cause
I Description
Activationof the
temperaturedetection
relay of the rediationfin.
External noise.
When the fin for cooling
power modules
is over-
heated, the temperature
sensor activatestostop
output
Consider the possibility
of external noisewhen
the alarm indication lamp
lightsupfor causes other
thanthese described above.
t
Countermeasure
Instantaneouspower
failure.
Coolingfan trouble or
ventilation obstruction in
radiationfin has caused a
rise intemperature, so
remove those troubles.
Twistedwire or shield
wire are used fo the fre-
quency settingsignal cir-
cuit
(10, 2.5). Shield wire
should be connectedto
terminal
"5 only and do
notconnect shield wire
with grounding or around
terminal of other circuit
(i.e., instrumentation
circuit).
Reset the inverter and
restart
it. Ifyouwish to
keep the alarm stateon
display, use an external
circuit.
Ifthere has been an in
stantaneous powerfailure
for
15 msec or more, and
the power supply has been
restored beforethe motor
has stopped after afree
running, overcurrentmay
occur.
Note: If you cannot identify the trouble even after checking all the points listed above, try discon-
nectingthe motor from the inverter. If the alarm indication lampstill comes on, there has been
abreakdowninthe inverter.

8-3 Measuring Voltage and Current
Since the primary and secondary voltage and current contain high frequency, data may differ depend-
ing uponthe instrument usedand the circuit tobe measured.
Ifyou use
a measuring instrument for commercial frequency, select one listed inTable 3 and measure
the circuit as shown in Fig.
5
Variation of the indicated value are shown in Fig. 6. However, even measuring instruments of the same
accuracy may be inconsistent because of differences in factors such as manufacturer, model type or
year made, etc.
FR-K Inverter
7
Fig. 5 Points tobe Measuredand Examplesof Measuring Instruments
Example: Output voltage of inverter
Motor rating:
3.7 kW 4P
FR-K.3700-U Inverter
Take the indicated value of
rectifier type voltmeter
as
100%.
4 Rectifier type
k
Moving-iron type
Electrothermic type
Fig. 6 Variation of IndicatedValue Dependingon the Type of the
Measuring Instrument

Table 3 TerminalstobeMeasuredand Measuring Instrument
Item
Supply voltage: V1
Current at powersupply:
I1
Terminals tobe measured
Across terminals Rand S,
Sand T, and T and R.
Linecurrent at terminals
R, Sand T.
Terminals R, Sand T and
across terminals Rand S,
and Sand T.
Power at power supply:
P1
Power factor at power
supply: Pfl
Measuringinstrument
Moving-irontype
9:
fi Moving-irontype
Electro-dynamo-
metertype
Measuresupply voltage (Vl),current at power supply (11) and power at powet
supply (PI
), and calculate power factor using equationshown below:
Remarks (referencevalue)
Commercialvoltage:
230V
P
= WII + Wn
Voltage at output: V2
Pfl
=
PI
fiV1
. I1
100%
Difference betweeneach
Across terminals
U and V,
V and W, and Wand
U.
phase should be within
10%
Rectifiertype
+ (Moving-irontype
is notavailable)
Current at output: 12 Belowratedcurrent of
inverter
Difference betweeneach
phase should be within
10%.
Linecurrent at terminals
U, V and W.
Power at output: P2
Moving-irontype
Terminals
U, V and Wand Electro-dynamo-
across terminals
U and V, $ metertype
and V and W.
Power factor at output:
Pf2 Calculate inasimilar manner as for power supply, usingthe followingequation:
Output ofconverter Across terminals Pand
N
Moving-coiltype
(suchas multi-
meter)
Charge lamp lightsup
when voltage is 10V DC
or more.
1.35 x v1
Maximum380V DC
during regeneration.
0 to5V DC
I 3
Movinwcoiltvpe
Frequencysettingsignal Across terminals2 and
5
(such is multi-.
W meter)
(internalresistance
5 0 kCl or more)
Power supply for fre-
quency setting Across terminals 10and 5
Across terminals FM and
SD About 5 V DC at
maximumfrequenq
(whenfrequency
meter is connected.)
Open: 13V DC to
19V DC
ON voltage:
1
V DC or less
OFF voltage:
13V DC or more
Power supply fot
frequency
Forward operation signal Across terminals STD and
SD
Reverse operation signal Across terminals STR and
SD
Reset Across terminals RES and
SD
Base shut-off (alarm)
signal Across terminals Band C Moving-coiltype
(such as multi-
meter)
Measuringcontinuity
Continuity when power
supply is shut off or
during normal operations.

9. STANDARD SPECIFICATIONS
FR-K- FR-K- FR-K- FR-K- FR-K- FR-K- FR-K-
400-U
/ 750-U 1500-U 2200-U 2.700-U
/ 55K-U 7.5K.U
I Nominal output (HP)
-
Output capacity (kVA)
-
Rated outputcurrent (A)
Maximum output voltage
Power source requirement (kVA)
ilVeight (kg)
Construction Totally enclosed type
1 Enclosed type
Voltagelfrequency
Allowable voltage regulation
Allowable frequency regulation
Control method Sinusoidal PWM, Voltage-control
Frequency range 1
: 10 (6 - 60Hr) or 1 : 20 (6 - 120Hz)or 1 : 40 (6 - 240Hz) selectable
(Operationstarts at 3Hz)
Frequency resolution
(Hzlmaximumfrequency)
Frequency accuracy
Voltageifrequency ratio VoltagefFrequency ratio is constant until 60Hz.
Voltage
is constant above 60Hz
7-
; Overcurrent resistance
I Frequency setting signal
150%for one minute
0 - 5V DC, 0 - 10V DC changeable
i
i Acceleration1deceleration time 0.2
- 3.0 rec. (in 0.2 sec. increments),
1
- 15sec. (in 1 sec. increments),
10
- 150sec. (in 10sec. increments)selectable
Regenerative brakingtorque Over 70% of rated motor torque (short time rating)
Protection against stalls caused byovercurrent, protection against stalls
caused byregenerative overvoltage, overcurrent protection, regenerativ,
overvoltage protection, overload protection (electronic thermal relay),
instantaneous power failure, thermo detect of the heatsink (*3), alarm
against overload.
Protectivefunctions
-1 O•‹C to+40•‹C -1 0•‹Cto+50•‹C
(To be free from freezing) (To be free
from freezing)
Ambient temperature
Ambient humidity Below 90% (To be free from condensation)
To be free from
To be free from corrosive gas corrosive gas
and dust
. --
Less than 1,000 m
Atmosphere
Altitude
Vibration Less than 0.5G
phase power supply of 200V 50Hz. 2001220V AC 60Hz.
ncy resolution at accelerationldeceleration is one half of table value.
ipped with
thermo detect of the heatrink.
17

10. PROTECTIVE FUNCTION
Theprotectivefunctions listedbeloware built intothe FR-KSeries inverters.
When the protective circuits are activated, output isstoppedby shutting off the base of the transistor so that
the modules are protected. This will cause the motor to stopafter abrief free run. To start again,
it is neces-
sary to either reset by usingthe reset terminal "RES", or toturnoff and on the power.
Protectionagainst stalls
caused by overcurrent
Protectionagainst stalls
caused by regenerative
overvoltage
Overcurrentprotection
Regenerativeovervoltage
protection
Instantaneouspowerfailurl
protection
Overloadprotection
(electronicthermal relay)
Overloadalarm
Thermodefect of the
heatsink
lote: When the overcurren
tection
is activated, ;
magnetic contactor (
to retain the alarm
independently. Inor
and
Sl, and connect
t P
an
MZ
disl
de~
the
Ifan overcurrentmorethan 150%of the ratedcurrent occurs duringacceleration,
the freauencv increase isstoppedand freauencv
is keot untilthe loadcurrent has
been reduced, thus preventingthe inverte; fromthe stall.
If an overcurrent larger
than 150%of the ratedcurrent occurs duringnormaloperations(at constant
speed), the frequency is decreased untilthe load current has been reduced, thus
preventingthe inverterfromthe stall. When the load current has beendecreased
below 156%.frequencywill be increased again and accelerationwill be continued
toreachthe set frequency level.
This protectivecircuitdetects any regenerativeenergy duringdeceleration, so
tha
the frequency decreasewill be stopped until the outputvoltage of the capacitor
has been reduced, thus preventingthe inverter from the stall. When the regener-
ativeenergy has been reduced, frequency will be decreasedagain and deceleration
continued.
Ifan overcurent larue than 200%of rated outout current is detectedthrouuh the
output current, the-overcurrentprotection circuit will
be activatedtocut iff the
transistor circuit and keep
it off. (When an overcurrent protection circuit has beel
activated, the alarm indication lamp will lightup.)
(Activationof the overcurrent protection circuit is caused mainly by apower
supply decrease, extreme load inertial
(GDz 1, extremely short presetacceleration
time, orashort-circuit inthe invertersecondary circuit, so to remove the trouble
and restorethe circuit examine all possible failure.)
When an overvoltageis caused by regenerativeenergy at the converteroutput, the
protection circuit is activatedtocut offthe transistor circuit and keep
it off. (An
alarm indication lamp will light up insuch cases.)
(Activationof the rGeneratLe overvoltage protection circuit
is causedmainly by
an extremely short preset deceleration time, so lengthenthe preset deceleration
time orconsider usingthe optional brake unit.)
Ifapower failure continues for
15 msec or more, the instantaneouspower failure
protection circuit
is activatedtocut off the transistor circuit and keep itoff. (An
alarm indicatorwill light up insuch cases.)
Ifthe power failure
is within 15msec, the protection circuit will notwork and th
control circuit will continueoperation.
Any overload while the motor
is runningunder its ratedcondition or overheating
at lowspeed running
is detected by an electronicthermal relay, which cuts off thl
transistorcircuitandkeepsitoff.(Alarmindicationlampwill Iightupinsuchcases.)
(Checkthe cause of the overload and either lightenthe load, change the opera-
tions pattern or reconsiderthe capacity of inverterand motor.)
Ifthe motor becomes overloaded, an alarm indication lamp will go onand off. If
overload increases further. the overcurrentprotectionfunction will be activated.
Ifthe alarm indicatorgoes on and off during
accelerationldeceleration, preset to
longer
accelerationldeceleration times. If an alarm indication begins blinking
duringfixed speed operation, lightenthe load or reconsider the capacity of
inverterand motor.
When the heat sink is overheated through adecrease inthe coolingeffect ofthe
semiconductor, thetemperaturesensor~isactivatedtostop the function and
output of the power element and to keepthem off. (Analarm indicatorwill light
up insuch cases.)
l~xaminethe coolingfan and the ambienttemperature.)
However. inverters belowtvoe FR-K-750are not providedwith this function,
A
~rotection,regenerativeovervoltageprotection, or instantaneouspowerfailure pro-
alarm indicator lamp lights up and that state will be retained. However, when the
i) is opened by an alarm signal, the alarm displaywill not be retained. Ifyou wish
play, design the circuit so that main circuit and control circuit are configurated
r to retain the display of an alarm, disconnect control circuit power terminal R1
!separatepower.