8 Protective Operations
47
Inverter Fault Notification
If a fault is detected in the Inverter, the SI-T stores the alarm or warning code in the
MECHATROLINK-II ALARM command and simultaneously turns ON the relevant bit in
the STATUS field.
The following table shows the alarm codes for SI-T notification if a fault is detected in the
Inverter.
Table 10 Inverter Alarm Codes
ALARM
Operator
Display
Description
G7
F7
01H
PUF
Fuse blown
{
{
02H
UV1
Main circuit undervoltage
{
{
03H
UV2
Control power undervoltage
{
{
04H
UV3
Inrush prevention circuit fault
{
{
06H
GF
Ground fault
{
{
07H
OC
Overcurrent
{
{
08H
OV
Main circuit overvoltage
{
{
09H
OH
Cooling fin overheating
{
{
0AH
OH1
Inverter’s cooling fan stopped
{
{
0BH
OL1
Motor overload
{
{
0CH
OL2
Inverter overload
{
{
0DH
OL3
Overtorque detected 1
{
{
0EH
OL4
Overtorque detected 2
{
{
0FH
RR
Internal braking transistor fault
{
{
10H
RH
Installed braking resistor overheating
{
{
11H
EF3
External fault 3
{
{
12H
EF4
External fault 4
{
{
13H
EF5
External fault 5
{
{
14H
EF6
External fault 6
{
{
15H
EF7
External fault 7
{
{
16H
EF8
External fault 8
{
{
18H
OS
Overspeed
{
{
19H
DEV
Excessive speed deviation
{
{
1AH
PGO
PG disconnection detected
{
{
1BH
PF
Main circuit voltage fault
{
{
1CH
LF
Output open phase
{
{
1DH
OH3
Motor overheating alarm
{
{
1EH
OPR
Digital operator connection fault
{
{
1FH
ERR
Operator error
{
{
20H
OH4
Motor overheating fault
{
{
21H
CE
MEMOBUS communications error
{
{
25H
CF
Control fault
{
{
26H
SVE
Zero-servo fault
{
{
27H
EF0
External fault input from communications option board
{
{
28H
FBL
PID feedback reference lost
{
{
29H
UL3
Undertorque detected 1
{
{
