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...

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...

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...

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...

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...

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...

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....

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...

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...

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...