4-11
4-3
Protective and Diagnostic Functions
4-3-1 Alarm Displays and Alarm Code Outputs
The Servo Driver has the error detection functions shown below. When an error is de-
tected, the alarm output (ALM ) and the alarm code output (AL01-03) are output, the Ser-
vo Driver’s internal power drive circuit is turned off, and the alarm is displayed.
H
Alarm Table
Dis-
l
Alarm code
Alarm
ALM
Error detection
f
i
Detection contents
play
ALO1 ALO2 ALO3
ALM
function
a.02
OFF
OFF
OFF
OFF
Parameter corruption
The checksum for the parameters read
from the EEPROM does not match.
a.04
OFF
OFF
OFF
OFF
Parameter setting error Incorrect parameter setting. (HA/LA/V/W
Models)
a.10
ON
OFF
OFF
OFF
Overcurrent
Overcurrent or overheating detected.
a.31
ON
ON
OFF
OFF
Deviation counter over-
flow
The pulses remaining on the deviation
counter exceed the deviation counter
overflow level set in Cn-1E.
a.40
OFF
OFF
ON
OFF
Overvoltage
Main circuit DC voltage exceeded the al-
lowable value.
a.51
ON
OFF
ON
OFF
Over speed
Detected at 4,950 r/min.
a.52
ON
OFF
ON
OFF
Excessive speed com-
mand input
Speed command for 4,700 r/min was in-
put. (H/L Models)
a.70
ON
ON
ON
OFF
Overload
Detected at reverse limit characteristics
when the output torque exceeds120% of
the rated torque. (HA/LA/V/W Models)
a.71
ON
ON
ON
OFF
Overload
Detected at reverse limit characteristics
when 135% of the rated torque was ex-
ceeded. (H/L Models)
a.72
ON
ON
ON
OFF
Overload
Detected at reverse limit characteristics
for 120% to 135% of the rated torque.
(H/L Models)
a.c1
ON
OFF
ON
OFF
Runaway detected.
Faulty power or encoder wiring.
a.c2
ON
OFF
ON
OFF
Phase error detected.
Connector not properly connected.
Encoder not properly wired.
a.c3
ON
OFF
ON
OFF
Encoder A or B phase
wire disconnection.
Either Phase A or Phase B signal was
disconnected or short circuited.
a.c4
ON
OFF
ON
OFF
Encoder S phase wire
disconnection.
Encoder S phase was disconnected or
short circuited.
a.f3
OFF
ON
OFF
OFF
Momentary power fail-
ure alarm
The power supply was re-started within
the power retention period.
a.99
OFF
OFF
OFF
ON
Alarm reset power sup-
ply turned on.
This is history data only, and is not an
alarm.
cpf00
OFF
OFF
OFF
OFF
Parameter Unit trans-
mission error 1
Data could not be transmitted after the
power supply was turned on. (It no longer
exists in the alarm history.)
cpf01
---
---
---
---
Parameter Unit trans-
mission error 2
Transmission timeout error (It no longer
exists in the alarm history.)
Note “---” means indefinite.
Application
Chapter 4
