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MDS-D2/DH2 Series Instruction Manual
9.4 Troubleshooting for Power Backup System
9.4.5 Troubleshooting for Each Warning No.
Warning No.
D0
Instantaneous power interruption :
Instantaneous power interruption of the input power supply or voltage drop between L+ and L- was detected. This warning also
occurs at normal power OFF.
Investigation details Investigation results Remedies
1
Check whether the power voltage is properly input
to L1, L2 and L3.
The voltage is not input properly. Inputt properly.
The voltage is input properly Check the investigation item No. 2.
2 Check the power supply voltage.
The voltage drops under the lower limit value.
Change the power supply voltage to be within the
specified range.
The voltage frequently drops under the lower limit
value.
Use a power supply voltage with a greater
capacity.
Voltage is below the specified limit. Check the investigation item No. 3.
3 Check the reproducibility.
Always reproduced. Replace the power backup unit.
This error occurs occasionally. Check the investigation item No. 4.
4
Check if there is any abnormality in the unit's
ambient environment. (Ex. Ambient temperature,
noise, grounding)
Take remedies according to the causes of the abnormality in the ambient environment.
Warning No.
D1
Over regeneration :
Over-regeneration detection level became over 100%.The regenerative resistor is overloaded.The warning is not released even
if the power turns ON again.
The warning is released if over-regeneration level drops to less than 80% in power ON state (usually takes 20 minutes).
Investigation details Investigation results Remedies
1 Check the reproducibility.
This error occurs every time the motor decelerates
at power failure or at power supply alarm.
Check the investigation item No. 2.
This error occurs occasionally. Check the investigation item No. 3.
2
Check the machine's load inertia and the maximum
motor rotation speed.
Increased than before.
Decrease the machine’s load inertia and the
maximum motor rotation speed.
No change. Check the investigation item No. 4.
3
Check the frequency at which power failure or
power supply alarm occurs.
Occurs more than once per hour.
Reduce the frequency at which power failure or
power supply alarm occurs.
The frequency is low. Check the investigation item No. 4.
4 Check the capacity of the resistor unit.
Capacity is not sufficient. Use a resistor unit with a greater capacity.
Capacity is sufficient. Replace the power backup unit.
Warning No.
D5
Resister unit overheat :
An overheat was detected by the thermal sensor of the resistor unit.
Investigation details Investigation results Remedies
1
Check if the regenerative resistor reaches high
temperatures.
The regenerative resistor reaches high
temperatures.
Wait for cooling of the regenerative resistor and
wait for the overheat of the thermal to be released.
The regenerative resistor does not reach high
temperatures.
Check the investigation item No. 2.
2
Check whether the THM1/THM2 terminals of CN43
are correctly connected.
There is connection failure. Connect correctly.
There is no connection failure. Check the investigation item No. 3.
3
Check for a disconnection between AL1/AL2
terminals of the regenerative resistor.
There is disconnection. Replace the regenerative resistor.
There is no disconnection. Replace the power backup unit.