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MDS-D2/DH2 Series Instruction Manual
7.3 Troubleshooting
(Note 1) When warning 9F occurs, do not turn the drive unit power OFF to ensure that the absolute position data is held.
Replace the battery with the drive unit power ON.
(Note 2) When using MDS-BTBOX-36, battery voltage drop warning (9F) is released by turning the drive unit power ON
again after replacing the battery.
Warning No.
9F
Battery voltage drop
The battery voltage that is supplied to the absolute position encoder dropped. The absolute position data is retained.
Investigation details Investigation results Remedies SV SP
1
Change the used battery and check whether the
warning does not occur. (Turning the power OFF
and ON is required.)
The warning does not occur. The battery has been drained.
◯
The warning occurs. Check the investigation item No. 2.
2
Check whether the battery cable is disconnected,
broken, or wired incorrectly.
The connection is faulty.
Correct the connection.
Replace the cable.
◯
The connection is normal. Check the investigation item No. 3.
3 Measure the new battery voltage.
Less than 3.4V. Replace the battery.
◯
3.4V or more.
Check the investigation item No. 6.
When a battery box is used, check the
investigation item No. 4.
4
Check whether the cable connecting between the
battery box and CN9 is short-circuited, broken, or
wired incorrectly.
The connection is faulty.
Correct the connection.
Replace the cable.
◯
The connection is normal. Check the investigation item No. 5.
5
Disconnect the BT-LG cable of the battery box, and
then measure the voltage between DO(ALM) and
DOCOM terminals at power ON.
Low voltage. Replace the battery box.
◯
Equivalent of 24V. Check the investigation item No. 6.
6
Perform a conductivity check with the encoder
cable between BT and LG of the drive unit in which
the warning was detected.
(Note) Make sure that the encoder side connector is
disconnected.
Resistance value is low. Replace the cable.
◯
Resistance value is 100MΩ or more.
Replace the encoder.
(With the absolute position system, the zero
point must be established.)
Warning No.
A3
In initial setup of ABS position
When the encoder with distance-coded reference marks is used, this warning is issued until the axis reaches the reference
position during the initial setup of the distance-coded reference check function. This warning disappears after the axis has
reached the position.
Or it is issued during the initial setup of MBA405W. This warning disappears after the axis has passed the Z-phase during the
initial setup and the NC power has been turned ON again.
Investigation details Investigation results Remedies SV SP
1 Warning does not disappear.
Encoder with
distance-coded
reference marks
Stopped on the way to the
reference position.
Setup again.
◯
-
MBA405W
The cycle counter is
displayed.
Turn the NC power ON again.
The display of the cycle
counter is "0".
Turn the NC power ON again after the axis
has passed the Z-phase.
Warning No.
A4
Dual signal warning
An input was detected in the signal related to the dual signal.
Investigation details Investigation results Remedies SV SP
1 Warning does not disappear. In emergency stop state? Cancel the emergency stop.
◯◯
Warning No.
A6
Fan stop warning
A cooling fan built in the drive unit stopped.
Investigation details Investigation results Remedies SV SP
1 Check the alarm No. "45" items.
◯◯
Warning No.
E0
Over regeneration warning
Over-regeneration detection level exceeded 80%.
Investigation details Investigation results Remedies SV SP
1 Check the acceleration/deceleration cycle.
The cycle operation being conducted is
severe for the average output.
Extend the cycle operation time to the length
that will not cause a warning.
◯◯
No problem. Check the investigation item No. 2.
2 Check the load inertia. The load inertia is large. Lower the load inertia.