Hitachi Sj7002 Owners Manual

Monitoring Trip Events, History, & Conditions
Troubleshooting
and Maintenance
6–14
Easy Sequence 
Error CodesUse the following table to diagnose errors re lated to Easy Sequence programming. The error 
code will appear when  the related program runs.
DeviceNet Expansion Card Errors
Error Code: OPE / SRWNameProbable Cause(s)
E43.-Invalid instruction A program c ontains an invalid instruction
PRG.CMDThe [PRG] terminal was turn ON but a 
program was not loaded
E44.-Nesting count error Subroutines with FOR...

SJ7002 Inverter
Troubleshooting
and Maintenance
6–15
Trip History and 
Inverter StatusWe recommend that you first find the cause of th e fault before attempting clearing it. When a 
fault occurs, the inverter stores important performance data at the moment of the fault. To 
access the data, use the monitor functions (Dxxx)  and select D081 for details about the present 
fault (E
n). The previous five faults are stored in D081 to D086, with D (En-1 to En-5). Each error 
shifts D081–D085 to D082–D086, and...

Restoring Factory Default Settings
Troubleshooting
and Maintenance
6–16
Restoring Factory Default Settings
You can restore all inverter parame ters to the original factory (default) settings for the intended 
country of use. After initializing the inverter, us e the powerup test in Chapter 2 to get the motor 
running again. To initialize the inverter, follow the steps below.
No.ActionDisplayFunc./Parameter
1 Use the , , and   keys to 
navigate to the “B” Group. “B” Group selected
2 Press the 
 key. First...

SJ7002 Inverter
Troubleshooting
and Maintenance
6–17
Maintenance and Inspection
Monthly and 
Yearly Inspection 
Chart
Item InspectedCheck for...
Inspection  Cycle
Inspection MethodCriteria
MonthYe a r
General Ambient  environment Extreme
temperatures
& humidity ✔
Thermometer, 
hygrometer Ambient temperature 
between -10 to 50°C, 
non-condensing
Major devices Abnormal  vibration, 
noise ✔
Visual and aural Stable environment for 
electronic controls
Power supply 
voltage Vo l t a g e  
tolerance ✔
Digital...

Maintenance and Inspection
Troubleshooting
and Maintenance
6–18
Note 1: The life of a capacitor is affected by the ambient temperature. See  “Capacitor Life 
Curve” on page 6–20.
Note 2: The inverter must be cleaned periodically. If dust accumulates on the fan and heat 
sink, it can cause overheating of the inverter .
Motor General Vibration
✔Visual, touch Ordinary range
Unusual odor ✔Look for signs of 
overheating Normal appearance
Insulation 
resistance Isolation 
boundary 
fault ✔
Disconnect motor...

SJ7002 Inverter
Troubleshooting
and Maintenance
6–19
Megger TestThe  megger  is a piece of test equipment that uses a  high voltage to determine if an insulation 
degradation has occurred. For inverters, it is im portant that the power terminals be isolated 
from the Earth GND terminal via  the proper amount of insulation.
The circuit diagram below shows the inverter wiri ng for performing the megger test. Just follow 
the steps to perform the test:
1. Remove power from the inverter and wait at least 10...

Maintenance and Inspection
Troubleshooting
and Maintenance
6–20
Spare partsWe recommend that you stock spare parts to reduce down time, including parts listed below:
Capacitor
Life CurveThe DC bus inside the inverter uses a large  capacitor as shown in the diagram below. The 
capacitor handles high  voltage and current as it smooths the power for use by the inverter. So, 
any degradation of the capacitor will affect th e performance of the inverter. The capacitor bank 
in SJ700
2 series inverters is...

SJ7002 Inverter
Troubleshooting
and Maintenance
6–21
Capacitor 
ReplacementThe DC section of the inverter main circuit uses  high-capacity aluminum electrolytic capacitors 
as smoothing filter components. Since chemical  reactions occur inside the capacitors, the 
service life of these parts depends mainly on th e ambient temperature and operating conditions, 
Capacitors used in a standard operating environm ent must be replaced after about 10 years. 
However, each capacitor must me immediately repl aced...

Maintenance and Inspection
Troubleshooting
and Maintenance
6–22
For inverters with sheet metal housings...
1. Loosen the two screws that secure the  lower front panel. Remove the panel from the 
inverter.
2. Turn OFF power to the inverter and confirm that the Charge Indicator LED is OFF.
3. Remove the lower screws from term inal block terminals [P] and [N].
4. Remove the screws that secure  the capacitor mounting plate.
5. Pull down the capacitor mounting plate.
6. Remove the bus bar and resistors. Then...

SJ7002 Inverter
Troubleshooting
and Maintenance
6–23
For inverters 11kW output and belo w with molded plastic housings...
The inverters in this category do not have separate  capacitor units. It is necessary to replace the 
main circuit board, accessible by following the steps below.
1. Loosen the two screws that secure the  lower front panel. Remove  the panel from the 
inverter.
2. Turn OFF power to the inverter and confir m that the Charge Indicator LED is OFF.
3. Loosen the two screws that secure the...