4-8
4-2
Protective and Diagnostic Functions
4-2-1 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 ) is output, the Servo Driver’s internal power drive circuit is
turned off, and the alarm is displayed.
j
Alarm Table
Dis-
Alarm
Error detection
Detection contents
Dis-
play
Alarm
ALM
Error detection
function
Detection contents
a.02
OFF
Parameter corruption
The checksum for the parameters read from the EEPROM does
not match.
a.04
OFF
Parameter setting error Incorrect parameter setting.
a.10
OFF
Overcurrent
Overcurrent or overheating detected.
a.31
OFF
Deviation counter over-
flow
The pulses remaining on the deviation counter exceed the devi-
ation counter overflow level.
a.40
OFF
Overvoltage
Main circuit DC voltage exceeded the allowable value.
a.51
OFF
Over speed
Detected at 4,950 r/min.
a.70
OFF
Overload
Detected at reverse limit characteristics when the output torque
exceeds120% of the rated torque.
a.c1
OFF
Runaway detected.
Faulty power or encoder wiring.
a.c2
OFF
Phase error detected.
Connector not properly connected.
Encoder not properly wired.
a.c3
OFF
Encoder A or B phase
wire disconnection.
Either Phase A or Phase B signal was disconnected or short cir-
cuited.
a.c4
OFF
Encoder S phase wire
disconnection.
Encoder S phase was disconnected or short circuited.
a.f3
OFF
Momentary power fail-
ure alarm
The power supply was re-started within the power retention peri-
od.
a.99
ON
Alarm reset power sup-
ply turned on.
This is history data only, and is not an alarm.
cpf00
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 histo-
ry.)
Note “---” means indefinite.
4-2-2 Alarm Output
This section describes the timing of alarm outputs when power is turned on and when
alarms occur. The method used to clear alarms is also described.
Application
Chapter 4
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