Yaskawa Matrix Converter - Manual (Page 334)

Protective and Diagnostic Functions
7-
13
OL4
(flashing)
Over-
torque
Det 2
Overtorque 2
There has been a current greater than
the setting in L6-05 for longer than the
setting in L6-06.
-
• Make sure that the current setting in
L6-05 and time setting in L6-06 are
appropriate.
• Check the mechanical system and
correct the cause of the overtorque.
UL3
(flashing)
Under-
torq Det
1
Undertorque 1
There has been a current less than the
setting in L6-02 for longer than the
setting in L6-03.
-
• Make sure that the settings in L6-02
and L6-03 are appropriate.
• Check the mechanical system and
correct the cause of the overtorque.
UL4
(flashing)
Under-
torq Det
2
Undertorque 2
There has been a current less than the
setting in L6-05 for longer than the
setting in L6-06.
-
• Make sure that the current setting in
L6-05 and time setting in L6-06 are
appropriate.
• Check the mechanical system and
correct the cause of the overtorque.
OS
(flashing)
Over-
speed
Det
Overspeed
The speed has been greater than the
setting in F1-08 for longer than the
setting in F1-09.
Overshooting/undershooting are
occurring.
Readjust the gain.
The reference speed is too high.
Check the reference circuit and refer-
ence gain.
The settings in F1-08 and F1-09 aren't
appropriate.
Check the settings in F1-08 and F1-09.
PGO
(flashing)
PG Open
PG Disconnect
The MxC is outputting a frequency,
but PG pulses aren't being input.
There is a break in the PG wiring. Fix the broken or disconnected wiring.
The PG is wired incorrectly. Fix the wiring.
Power isn't being supplied to the PG. Supply power to the PG properly.
DEV
(flashing)
Speed
Devia-
tion
Excessive Speed Deviation
The speed deviation has been greater
than the setting in F1-10 for longer
than the setting in F1-11.
The load is too large. Reduce the load.
The acceleration time and decelera-
tion time are too short. Lengthen the acceleration time and
deceleration time.
The load is locked. Check the mechanical system.
The settings in F1-10 and F1-11 aren't
appropriate.
Check the settings in F1-10 and F1-11.
EF0
(flashing)
Opt
External
Flt
External Fault Detected for Com-
munications Card
Continuing operation was specified
for EF0 (F6-03 = 3) and an external
fault was input from the option card.
- Remove the cause of the external fault.
EF3
(flashing)
Ext Fault
S3
External Fault (Input Terminal S3)
An external fault was input from a
multi-function input terminal (S3 to
S12).
• Reset external fault inputs to the
multi-function inputs.
• Remove the cause of the external
fault.
EF4
(flashing)
Ext Fault
S4
External Fault (Input Terminal S4)
EF5
(flashing)
Ext Fault
S5
External Fault (Input Terminal S5)
EF6
(flashing)
Ext Fault
S6
External Fault (Input Terminal S6)
Table 7.2 Alarm Displays and Processing (Continued)
Display Meaning Probable causes Corrective Actions