Hitachi Sj7002 Owners Manual

							Troubleshooting
Troubleshooting
and Maintenance
6–4
The motor speed will not reach  the target frequency (desired 
speed). •
If using the analog input, is there 
current or voltage at [O] or [OI]? •
Check the wiring.
• Check the potentiometer or signal 
generating device.
• Is the load too heavy? •Reduce the load.
• Heavy loads activate the overload 
restriction feature  (reduces output as 
needed).
• Is the inverter internally limiting the 
output frequency? •
Check max frequency setting 
(A004)
•
Check frequency upper limit 
setting (A061)
•If using analog inputs, check 
their settings (A101– A104) or 
(A111–A114), or (A011–A014)
The rotation is unstable. •
Is the load fluctuation too great?
• Is the supply voltage unstable?
• Is the problem occurring at a particular 
frequency? •
Increase the motor capacity (both 
inverter and motor).
• Fix power supply problem.
• Change the ou tput frequency 
slightly, or use the jump frequency 
setting to skip the problem 
frequency.
The RPM of the motor does not  match the inverter output 
frequency setting. •
Is the maximum  frequency setting 
A004 correct?
• Does the monitor function D001 
display the expected output frequency? •
Verify the V/F settings match motor 
specifications.
• Make sure all scaling (such as A011 
to A014) is properly set.
A parameter  will not 
change after  an edit 
(reverts to 
old setting). True for certain 
parameters
•
Is the inverter in Run Mode? Some 
parameters cannot be edited during 
Run Mode. •
Put inverter in Stop Mode (press the 
Stop/reset key). Then edit the 
parameter.
True for all 
parameters •
If you’re using the [SFT] intelligent 
input (software lock function)—is the 
[SFT] input ON? •
Change the state of the SFT input, 
and check the B031 parameter (SFT 
mode).
Symptom/conditionProbable CauseSolution

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							SJ7002 Inverter
Troubleshooting
and Maintenance
6–5
Monitoring Trip Events, History, & Conditions
Fault Detection 
and ClearingThe microprocessor in the inverter detects a 
variety of fault conditions and captures the event, 
recording it in a history ta ble. The inverter output 
turns OFF, or “trips” similar to the way a circuit 
breaker trips due to an over-current condition. 
Most faults occur when the motor is running (refer 
to the diagram to the right). However, the inverter 
could have an internal fault and trip in Stop Mode. 
In either case, you can clear the fault by pressing 
the Stop/Reset key. Additionally, you can clear the 
inverter’s cumulative trip hi story by performing the procedure  “
Restoring Factory Default 
Settings” on page 6–16 (setting B_84=00 will clear the trip  history but leave inverter settings 
intact).
Error Status 
CodesThe conditions at the time of an error provide  important clues to help you understand the cause. 
The SJ700
2 inverter displays a “status at trip point”  digit to the right of the decimal point for 
some error codes. For example, 
E07.2 means Error 7 occurred and  the inverter status was 
condition # “2” when the error occurred.
Run Stop
Fault Tr i pFaultRUN
STOPRESET
STOPRESET
Status 
CodesInverter StatusStatus CodesInverter Status
---.0Reset---.5Run Command active with 0 Hz 
speed reference
---. 1Stop---.6Starting
---.2Deceleration---.7DC braking
---.3Constant speed---.8Overload restriction
---.4Acceleration---.9SON or FOC operation in 
progress

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							Monitoring Trip Events, History, & Conditions
Troubleshooting
and Maintenance
6–6
Error CodesAn error code will appear on the display automati cally when a fault causes the inverter to trip. 
The following table lists the cause associated with the error.
OPE / SRW 
DisplayNameDescriptionTroubleshooting and Corrective Action
E0 1.-Over-current protection If the motor is constrained 
or suddenly accelerated or 
decelerated, a high current 
will flow in the inverter 
and the inverter may fail. 
To avoid this problem, the 
inverter shuts off its output 
and displays the error code 
shown on the left when it 
detects a current higher 
than a specified level. This 
protective function uses a 
DC current detector (CT) 
to detect over-current. 
When a current as high as 
about 220% of the 
inverters rated output 
current is detected, the 
protective circuit operates 
and the inverter trips. During 
constant 
speed 
operation•Check whether the load has fluctuated 
sharply.
•Check for the short circuit of output 
connections (check the output cables).
•Check for a ground fault (check the 
output cables and motor).
OC.Drive
E02.-Over-current 
protection During 
deceleration•Check whether the inverter has deceler-
ated the motor quickly increase the decel-
eration time).
OC.Decel
E03.-Over-current 
protection During 
acceleration•Check whether the inverter has acceler-
ated the motor quickly (increase the 
acceleration time).
•Check whether the motor has been locked 
(check the motor and wiring).
•Check whether the to
rque boost current 
has been set too high (reduce the boost 
current).
OC.Accel
E04.-Over-current 
protection Other 
conditions•Check whether the DC braking force is 
too high (reduce the braking force).
•Check whether the current detector (CT) 
is normal (replace or repair the CT).
Over.C
E05.-Overload 
protection
(*1) (*4) This protective function monitors the 
inverter output current, and shuts off the 
inverter output and di
splays the error code 
shown on the left when the internal 
electronic thermal protection circuit 
detects a motor overload. If the error 
occurs, the inverter wi ll trip according to 
the setting of the electronic thermal 
function.•Check whether the motor load is too high. 
(reduce the load factor).
•Check whether the thermal level is appro-
priate (adjust the le vel appropriately).
Note: The electronic thermal protection is 
easily triggered when  the output frequency is 
5 Hz or less. If the moment of inertia of the 
load is large, this  protective function may 
operate when the inverter accelerates the 
motor and the acceleration may be disabled. 
If this problem occurs,  increase the torque 
boost current or adjust other settings as 
needed.
OL.BRD
E06.-Braking 
resistor 
overload 
protection
When the BRD operation rate exceeds the 
setting of B090, this protective function 
shuts off the inverter output and displays 
the error code shown on the left.•Check whether the inverter has decreased 
the motor quickly (inc
rease the decelera-
tion time).
•Check whether the operation cycle is too 
short (prolong the  operation cycle)
•Check whether the set BRD operation 
rate is too low (adjust the setting to an 
appropriate level).
Note: Confirm the maximum allowable 
capacity of the resistor.
OL.BRD

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							SJ7002 Inverter
Troubleshooting
and Maintenance
6–7
Note 1: The inverter will not accept any reset  command within about 90 seconds after 
tripping (i.e., after the prot ective function operates). Be  sure to turn OFF the input 
power supply after waiting  two minutes for cooling.
Note 2: The inverter will not accept any reset co mmand after an EEPROM error occurs with 
error code displayed. Turn off the inverter  power once. If error code E08 is displayed 
when the inverter power is turned on subs equently, the internal memory device may 
have failed or parameters may have not been  stored correctly. In such cases, initialize 
the inverter, and then reset the parameters.
Note 3: The inverter will not accept reset commands input via the RS terminal or entered by 
the STOP/RESET key. Therefore, turn off the inverter power.
Note 4: Be sure to reduce the inverter’s output  current and the motor load before restarting 
after overload protection (E05). If the cont inuous reset/restart operations for error 
E05 could cause damage  to the inverter.
NOTE: If an EEPROM error E08 occurs, be sure to  confirm the parameter data values are still 
correct.
E07.-Over-voltage 
protectionIf the DC voltage across the P and N 
terminals rises too high, an inverter 
failure may result. To avoid this problem, 
this protective function shuts off the 
inverter output and displays the error code 
shown on the left when the DC voltage 
across the P and N terminals exceeds a 
specified level because 
of an increase in 
the energy regenerated by the motor or 
the input voltage (dur ing operation). The 
inverter will trip if the DC voltage across 
the P and N terminals exceeds about 400 
VDC (in case of the 200 V class models) 
or about 800 VDC (in case of the 400 V 
class models).•Check whether the inverter has decreased 
the motor quickly (inc rease the decelera-
tion time).
•Check for a ground fault (check the 
output cables and motor).
•Check whether the moto r has been rotated 
by the action of th e load (reduce the 
regenerative energy).
Over.V
E08.-EEPROM 
error
(*2) (*3)
When an internal-EEPROM is caused by 
external noise or an abnormal temperature 
rise, the inverter shuts off its output and 
displays the error code shown on the left.
Note:
 An EEPROM error may result in a
CPU error.•Check for the noise sources located near 
the inverter (remove noise sources).
•Check whether the cooling efficiency has 
deteriorated (check the heat sink for 
clogging and clean it).
•Check the cooling fan (replace if needed).
EEPROM
E09.-Under-voltage If the inverter input voltage drops, the 
control circuit of the inverter cannot 
function normally. Ther efore, the inverter 
shuts off its output wh en the input voltage 
falls below a specified level. The inverter 
will trip if the DC voltage across the P 
and N terminals exceeds about 175 VDC 
(in case of the 200 V class models) or 
about 345 VDC (in case of the 400 V 
class models).•Check whether the power supply voltage 
has dropped (check the power supply).
•Check whether the power supply capacity 
is sufficient (check  the power supply).
•Check whether the thyristor has been 
damaged (check the thyristor).
Under.V
E 10.-CT error If an erro
r occurs in the internal current 
detector (CT), the inverter will shut off its 
output and display the error code shown 
on the left. The inverter will trip when the 
CT outputs about 0.6 V or more at 
power-on.•Check whether the inverter has failed 
(repair the inverter).
CT
OPE / SRW 
DisplayNameDescriptionTroubleshooting and Corrective Action

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							Monitoring Trip Events, History, & Conditions
Troubleshooting
and Maintenance
6–8
Note 5: The inverter will not accept reset commands  input via the [RS] terminal or entered by 
the STOP/RESET key. Therefore, turn off the inverter power.
OPE / SRW 
DisplayNameDescriptionTroubleshooting and Corrective Action
E 1 1.-CPU error (*5) If the internal CPU malfunctions or an  error occurs in it, the inverter will shut 
OFF its output and display the error code 
shown on the left.
Note: Reading abnormal data from the 
EEPROM may result in a CPU error.•Check for the noise sources located near 
the inverter (remove noise sources).
•Check whether the inverter has failed 
(repair the inverter).
CPU
E 12.-External trip If an error occurs in the external equip-
ment or device connected to the inverter, 
the inverter will latch the error signal and 
shut off its output. (This protective 
function is active when the external trip 
function is enabled.)•If the inverter’s external trip function is 
enabled, check whether an error has 
occurred in external equipment (clear the 
error in the external equipment).
EXTERNAL
E 13.-USP error A USP error is
 indicated when the 
inverter power is turn ed on with an input 
operation signal remaining in the inverter. 
(This protective function is active when 
the USP function is enabled.)•If the USP function  has been enabled, 
check whether the inverter power has 
been turned on with an input operation 
signal remaining in th e inverter (reset the 
operation command, and then turn ON the 
inverter power).
USP
E 14.-Ground fault 
protection (*5)
When the inverter power is turned ON, 
this protective function detects the ground 
fault between the inve
rter output circuit 
and the motor to protec t the inverter. (This 
function does not operate when a residual 
voltage remains in the motor.)•Check for the ground fault (check the 
output cables and motor).
•Check the inverter itself for abnormality 
(remove the output cables from the 
inverter, and then check the inverter).
•Check the main circ uit for abnormality 
(use testing methods described in this 
chapter and repair the inverter).
GND.Flt
E 15.-Input over-
voltage 
protection
This protective function determines an 
error if the input volta
ge is kept above the 
specification level fo r 100 seconds while 
the inverter is stopp ed. The inverter will 
trip if the DC voltage  of the main circuit 
is kept above about 390 VDC (in case of 
the 200 V class models) or about 780 
VDC (in case of the 400 V class models).•Check whether the input voltage is high 
while the inverter is stopped (lower the 
input voltage, suppress the power voltage 
fluctuation, or connect an AC reactor 
between the power supply and the inverter 
input.)
OV.SRC
E 16.-Instantaneous 
power failure 
protection
If an instantaneous power failure lasts 
15 ms or more, the inverter will shut off 
its output. When 
the power failure 
duration is long, the inverter assumes a 
normal power-OFF. If a restart mode has 
been selected and an operation command 
remains in the inverter, the inverter will 
restart after the power is recovered.•Check whether the power supply voltage 
has dropped (recover the power supply).
•Check the MCB and magnetic contactors 
for poor contacts (replace the MCB and 
the magnetic contactor).
Inst.P-F
E20.-Temperature 
error due to 
low cooling-
fan speed The inverter will display the error code 
shown on the left if the lowering of 
cooling fan speed is detected at the occur-
rence of the temperat
ure error described 
below.•Check whether the cooling efficiency has 
been lowered (replace the cooling fan).
•Check the heat sink for clogging (clean 
the heat sink).
OH.stFAN
E2 1.-Temperature 
error
If the main circuit temperature rises 
because of a high ambient temperature or 
for other reasons, the inverter will shut 
OFF its output.•Check whether the inverter is installed 
vertically (check 
the installation.)
•Check whether the ambient temperature 
is high (lower the ambient temperature).
OH.fin

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							SJ7002 Inverter
Troubleshooting
and Maintenance
6–9
OPE / SRW 
DisplayNameDescriptionTroubleshooting and Corrective Action
E23.-Gate array 
communica-
tion error If an error occurs in the communication 
between the internal CPU and gate array, 
the inverter will trip.•Check for the noise sources located near 
the inverter (remove noise sources).
•Check whether the communication cable 
has been disconnected (check the connec-
tors).
GA.COM
E24.-Phase loss 
input protec-
tion
When the phase loss 
input protection has 
been enabled (B006 = 01), the inverter 
will trip to avoid dama ge if an phase loss 
input is detected. The inverter trips when 
the phase loss input  continues for about 
1 second or more.•Check for the phase loss power input. 
(check the power supply input wiring).
•Check the MCB and ma gnetic contactors 
for poor contacts (replace the MCB and 
magnetic contactors).
PH.fail
E25.-Main circuit 
error (*6)
The inverter will trip if the gate array 
cannot confirm the ON/OFF state of 
IGBT because of a malfunction due to 
noise, short or damage to the main circuit 
element.•Check for the noise sources located near 
the inverter (remove noise sources.)
•Check the main circuit element for 
damage. Check the output circuit for a 
short circuit (check the IGBT).
•Check the inverter fo
r abnormality (repair 
the inverter).
Main.Cir
E30.-IGBT error 
(*7)
If instantaneous over-c
urrent occurs, the 
main circuit elemen t temperature is 
abnormal, or the ma in circuit element 
drive power drops, the inverter will turn 
OFF its output to protect the main circuit 
element. (After tripping because of this 
protective function, the inverter cannot 
retry the operation.)•Check the output circuit for a short circuit 
(check the output cables).
•Check for the ground fault (check the 
output cables and motor).
•Check the main circuit element for 
damage (check the IGBT).
•Check the heat sink for clogging (clean 
the heat sink).
IGBT
E35.-Thermistor 
error
The inverter monitors 
the resistance of the 
thermistor (in the motor) connected to the 
inverter’s [TH] terminal, and will turn 
OFF the inverter output if the motor 
temperature rises.•Check whether the motor temperature is 
high (check the motor temperature).
•Check whether the internal thermistor of 
the motor has been damaged (check the 
thermistor).
•Check whether noise has been mixed in 
the thermistor signal (separate the therm-
istor wiring from other wirings).
TH
E36.-Braking error When “01” has been specified for B120 
Brake Control Enable, the inverter will 
trip if it cannot receive the braking confir-
mation signal within B124 Brake Wait 
Time for Confirmation  after the output of 
the brake release signal.•Check whether the brake has been turned 
on and off or not (check the brake).
•Check whether the wait time (B124) is 
too short (increase the wait time B124).
•Check whether the braking confirmation 
signal has been input (check the wiring).
BRAKE
E37.-Emergency 
stop (*8)
If the EMR signal (on three terminals) is 
turned ON when the slide switch (SW1) 
on the logic board is set to ON, the 
inverter hardware will turn OFF the 
inverter output and display the error code 
shown on the left. The malfunction is due 
to incoming noise when EMR terminal is 
not ON.•Check whether an e
rror has occurred in 
the external equipment since the 
emergency stop function was enabled. 
(recover the external equipment from the 
error.)
•Check for the noise sources located near 
the inverter (remove noise sources).
EMR
E38.-Low-speed 
overload 
protection
If overload occurs during the motor 
operation at a very low speed at 0.2 Hz or 
less, the electronic
 thermal protection 
circuit in the inverter will detect the 
overload and shut off the inverter output 
(2nd electronic thermal control).
Note:  A high frequency  may be recorded 
as the error history data.•Check whether the motor load is too high 
(reduce the load factor).
OL-LowSP

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							Monitoring Trip Events, History, & Conditions
Troubleshooting
and Maintenance
6–10
Note 6: The inverter will not accept  reset commands input via the RS terminal or entered by 
the STOP/RESET key. Therefore, turn off the inverter power.
Note 7: The inverter applied for 004 to 110L/H will  not accept reset commands input via the 
RS terminal or entered by the STOP/RESET key. Therefore, turn off the inverter 
power.
Note 8: The inverter will not accept the reset co mmand entered from the digital operator. 
Therefore, reset the inverter by turning on the RS terminal.
NOTE: If an EEPROM error (E08) occurs, be sure to  confirm the parameter data values are 
still correct.
E41.-ModBus 
communica-
tion errorIf time-out occurs because of line discon-
nection during the communication in 
ModBus-RTU mode, the inverter will 
display the error code shown on the left. 
(The inverter will trip according to the 
setting of C076.)•Check whether the communication speed 
setting is correct.
•Check whether the wiring distance is 
appropriate (check the connections).
NET.ERR
E60.-
to
E69.-Option 1 error The inverter de
tects errors in the option 
board mounted in the optional slot 1. For 
details, refer to the instruction manual for 
the mounted option board.•Check whether the option board is 
mounted correctly (check the board 
mounting).
•Check whether the option board is used 
correctly (refer to th e instruction manual 
for the option board SJ-FB, SJ-DG, or 
SJ-DN).
OP1-0
OP1-9
OPE / SRW 
DisplayNameDescriptionTroubleshooting and Corrective Action

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							SJ7002 Inverter
Troubleshooting
and Maintenance
6–11
Expansion Card 
Error CodesThe inverter monitors the operation of the 
expansion cards (optional) that may be 
installed in the expansion bay. 
On the inverter’s digital operator, error 
codes in the E60 range refer to the upper 
card position. Error codes in the E70 range 
refer to the lower card position. For the 
remote operator display, error codes are in 
the OP1 or OP2 ranges, respectively. If an 
error occurs, the inverter trips (displays the 
corresponding error code and turns OFF the 
motor output). 
Encoder Input Card –  Use the following 
table to diagnose errors caused by an 
encoder input expansio n card. Each error 
will cause the inverter to trip, turning OF F its output and displaying an error code.
If an encoder expansion card does not operate  normally, use the following table to check the 
DIP switch settings on the card.
Encoder Input Expansion Card Errors
Error Code: OPE / SRWNameProbable Cause(s)
E60.- E70.-Encoder disconnect Encoder wiring  to the expansion card is 
disconnected
OP1-0     OP2-0The encoder is faulty
The encoder type is  not correct (no line 
driver output, etc.)
E6 1.-  E7 1.-Excessive speed The motor speed increased to the  maximum frequency (A004) times the 
over-speed error detection level (P026)
OP1-1     OP2-1
E62.- E72.-Positioning error While in position control mode the position error (command minus actual) 
reached 1,000,000 pulses or more
OP1-2     OP2-2
E63.- E73.-Position control 
range tripWhile in absolute position control mode, 
the actual position exceeded the forward 
(P072) or reverse (P073) position range 
value
OP1-3     OP2-3
E69.- E79.-SJ-FB connection 
errorThe SJ-FB expansion ca
rd is not mounted 
properly or the card is faulty
OP1-9     OP2-9
DIP SwitchSwitch 
NumberSetting
SWENC 1 ON setting enables encoder disc
onnect function for loss of A 
or B channel
2 ON setting enables encoder disc onnect function for loss of Z 
channel
SWR 1 ON setting connects the 150
Ω termination resistor across 
terminals [SAP] and [SAN]
2 ON setting connects the 150 Ω termination resistor across 
terminals [SBP] and [SBP]
E6x or OP1 Error range:
E7x or OP2

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							Monitoring Trip Events, History, & Conditions
Troubleshooting
and Maintenance
6–12
Digital Input Card –  Use the following table to diagnose errors caused by a digital input 
expansion card. Each error will  cause the inverter to trip, turning OFF its output and displaying 
an error code.
The input mode is determined by a combination of  DIP switch and rotary switch settings. If the 
expansion card does not operate normally, use the following table to check the DIP switch and 
rotary switch settings. The check marks indicate  input modes specified by switch settings. For 
more details, refer to the expansion card instruction manual.
Digital Input Expansion Card Errors
Error Code: OPE / SRWNameProbable Cause(s)
E60.- E70.-Digital input 
expansion card error A communications time-out between the 
inverter and the digital input card has 
occurred
OP1-0     OP2-0
DIP SwitchRotary 
SwitchFrequency Setting, HzAccel / Decel Time,  SecondsTorque 
limit 
SettingPosition  Setting
12Code0.010.11Rate0.010.111%1 pulse
OFF: BIN 
(binary input) /  ON: BCD 
(binary coded 
decimal input) OFF: PAC 
(batch input  mode) 0
1
2
3
4
✔
5
6 ✔
ON: DIV 
(divided input 
mode 0
✔✔✔✔
1 ✔
2 ✔
3 ✔✔
4 ✔
5 ✔
6 ✔✔
7 ✔
8 ✔
9 ✔✔
A ✔
B ✔

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							SJ7002 Inverter
Troubleshooting
and Maintenance
6–13
DeviceNet Expansion Card –  Use the following table to diagnose errors caused by a 
DeviceNet expansion card. Each er ror will cause the inverter to trip (according to parameter 
settings P045 and P048), turning OFF it s output and displaying an error code.
If the expansion card does not  operate normally, use the following diagrams to check the DIP 
switch settings. For more details, refer  to the expansion card instruction manual.
DeviceNet Expansion Card Errors
Error Code: OPE / SRWNameProbable Cause(s)
E60.- E70.-DeviceNet Communication 
ErrorThe communication speed may be 
incorrect
OP1-0     OP2-0The network wiring length may 
not be appropriate
A connector is loose (or wire not 
connected)
E6 1.-  E7 1.-Duplicate MAC ID Two or 
more devices on the 
network have the same MAC ID
OP1-1     OP2-1
E62.- E72.-External trip Check the Force Fault/Trip bit. 
Attribute 17 in the Instance 1 of 
Class 19 may be set to 1. If so, 
clear the bit to 0.
OP1-2     OP2-2
E69.- E79.-Inverter communication 
error The expansion card may not be 
properly connected to the inverter
OP1-9     OP2-9
DR1 DR0DRDR1 DR0DRDR1 DR0DR
125 kbps250 kbps500 kbps
DeviceNet Baud Rate Setting
MAC ID
DIP switch example
DeviceNet MAC ID Setting
NA32 NA16 NA8 NA4 NA2 NA1
Description of switch setting
543210
= 29h (hex) = 41 (decimal)

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