167
[When in Trouble]
When in
T
roub
le
Protective
function
Causes
Measures
Error
code No.
Position
deviation
excess
protection
24
Deviation pulses have exceeded the setup of SV.Pr70
(Position deviation error level).
1)The motor movement has not followed the command.
2)Setup value of SV.Pr70 (Position deviation error
level) is small.
1)Check that the motor follows to the position
command. Check that the output toque has not
saturated in torque monitor. Make a gain adjustment.
Set up maximum value to SV.Pr5E (1st torque limit)
and SV.Pr5F (2nd torque limit). Make a encoder
wiring as per the wiring diagram. Set up the longer
acceleration/deceleration time. Lower the load and
speed.
2)Set up a larger value to SV.Pr70, or set up 0
(invalid).
*Encoder
communi-
cation error
protection
21
Communication between the encoder and the driver
has been interrupted in certain times, and
disconnection detecting function has been triggered.
• Make a wiring connection of the encoder as per the
wiring diagram. Correct the miswiring of the
connector pins. Note that the encoder cable to be
connected to CN X6. (Check that the encoder cable
is not connected to the connector CN X7 for external
scale connection by mistake.)
• Secure the power supply for the encoder of DC5V
±
5%
(4.75 to 5.25V)...pay an attention especially when the
encoder cables are long.
• Separate the encoder cable and the motor cable if
they are bound together.
• Connect the shield to FG...Refer to P.38, "Wiring to
the Connector, CN X6" of Preparation.
*Encoder
communi-
cation
data error
protection
23
Communication error has occurred in data from the
encoder. Mainly data error due to noise. Encoder
cables are connected, but communication data has
some errors.
*Hybrid
deviation
excess
error
protection
25
Position of load by the external scale and position of
the motor by the encoder slips larger than the setup
pulses with SV.Pr7B (Setup of hybrid deviation excess)
at full-closed control.
• Check the connection between the motor and the load.
Check the looseness, slippage and backlash.
• Check the connection between the external scale and
the driver.
• Check that the variation of the motor position
(encoder feedback value) and the load position
(external scale feedback value) is the same sign
when you move the load.
• Check that the numerator and denominator of the external
scale division (SV.Pr78, 79 and 7A) and reversal of
external scale direction (SV.Pr7C) are correctly set.
Over-speed
protection
26
The motor rotational speed has exceeded the setup
value of SV.Pr73 (Over-speed level setup)
• Do not give an excessive speed command.
• Make a gain adjustment when an overshoot has
occurred due to a poor gain adjustment.
*External
scale com-
munication
data error
protection
28
Communication error has occurred in data from the
encoder. The data could be received normally, but an
error occurred in the data due to noise.
• Separate the encoder cable and the motor cable if
they are bound together.
• Connect the shield to FG...refer to wiring diagram.
Deviation
counter
overflow
protection
29
34
Deviation counter value has exceeded 2
27
(134217728).
• Check that the motor runs as per the position com-
mand.
• Check that the output toque has not saturated in
torque monitor.
• Make a gain adjustment.
• Set up longer acceleration/deceleration time. Lower
the load and speed.
Software
limit
protection
The motor exceeded an allowable motor operation
range specified by SV.Pr26 (software limit setup)
against the position command input range.
1)Gain has not matched up.
2)Setup value of SV.Pr26 (Software limit setup) is small.
Refer to P.170,"Software Limit Function" before using
this.
1)Check the gain (balance of position loop gain and ve-
locity loop gain) and the inertia ratio.
2)Setup a larger value to SV.Pr26. Otherwise, set
SV.Pr26 to “0” and disable the software limit protection.
<Remarks>
When the protective function with a prefix of "*" in the protective function table is triggered, you cannot clear
with alarm clear input.
