bnp-b2365(eng)b.pdf - 第341页

6. Troubleshooting 6 - 36 Alarm No. 75 Overvoltage The main circuit PN bus voltage exceeded the tolerable value. Investigation det ails In vestigation results Remedies CV CR The alarm occurs each time the motor decelerat…

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6. Troubleshooting
6 - 35
Alarm No.
73
Over-regeneration
The over-regeneration detection level exceeded 100%. The regenerative resistor is in the overload
state.
Investigation details Investigation results Remedies
CV CR
The regenerative load display
increases when the power is turned
ON and the motor is not rotated.
Check whether the state is affected
by power fluctuation, grounding or
noise. If there is no problem, replace
the unit.
The regenerative load display
increases each time the motor
decelerates, and the alarm occurs.
A-CR : Investigate item 2.
C1-CV : Investigate item 4.
1 Check the alarm occurrence state
and regenerative load displayed on
the NC Monitor screen while
changing the operation mode.
The regenerative load display
increases each time the motor
decelerates, but the alarm does not
occur when the operation mode is
eased.
A-CR : Investigate item 2.
C1-CV : Ease the operation mode.
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The setting is incorrect. Correctly set. (Refer to the section for
alarm No. 6D.)
2 Check whether the parameter
(regenerative resistor type) of the
drive unit controlling the power
supply unit is correct.
The setting is correct. Investigate item 3.
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The regenerative resistor is
abnormal.
Replace the regenerative resistor. 3 Check the regenerative resistor's
state.
• Is oil adhered?
• Measure the resistance value.
There is no problem. Investigate item 4.
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4 Check the alarm No. "75" items.
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Alarm No.
74
Regenerative resistor overheat
The temperature protection function in the regenerative resistor activated.
Investigation details Investigation results Remedies
CV CR
The resistor is overheated. Investigate item 2. 1 Check whether the regenerative
resistor is overheated.
The resistor is not overheated. Investigate item 3.
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Check whether over-regeneration
occurred before.
Refer to the section for alarm No.73.2 Check the alarm history.
Over-regeneration has not occurred
before.
Take measures to dissipate the
regenerative resistor's heat.
• Improve the ventilation.
• Install a fan.
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The wire is about to break. Replace the wire.
There is no continuity at the resistor's
thermal terminal.
Replace the resistor unit.
3 Check the connections of the CN22
(B) connector pins 1 and 2.
• Check whether the pins are
short-circuited with the resistor's
thermal terminal or wire.
There is no problem. Replace the power supply unit.
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6. Troubleshooting
6 - 36
Alarm No.
75
Overvoltage
The main circuit PN bus voltage exceeded the tolerable value.
Investigation details Investigation results Remedies
CV CR
The alarm occurs each time the
motor decelerates.
Investigate item 3. 1 Check the repeatability.
The alarm occurs occasionally. Investigate item 2.
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Auxiliary regeneration frequency over
(E8) occurs just before the
overvoltage occurs.
Limit the occurrence of the excessive
instantaneous regeneration by not
decelerating multiple axes at the
same time.
2 Check the power supply's alarm
history.
Others. Investigate item 3.
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The power capacity is insufficient. Increase the power capacity. 3 Check the power capacity.
The specified power capacity is
secured.
Investigate item 4.
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The voltage drops to 170V or less
occasionally.
Increase the power capacity.
The difference of the voltage across
wires is 10V or more.
Improve the power phase balance.
4 Measure the voltage across wires.
• Is the voltage 170V or more even
when the motor is accelerating?
The difference of the voltage across
wires is less than 10V.
Investigate item 5.
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The power voltage is distorted. Improve the source of the distortion.
Install an AC reactor.
5 Measure the power voltage with a
synchroscope, and check whether
there is any distortion.
• Are there any other devices
causing the power distortion?
The power voltage waveform is not
abnormal.
Investigate item 6.
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No abnormality is found in particular. Replace the unit. 6 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Noise, grounding)
The grounding is incomplete.
An alarm will occur easily if another
device operates.
Take remedies according to the
causes of the abnormality.
Ex. Incomplete grounding:
Additionally ground.
Noise: Noise measures for
other devices.
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Alarm No.
76
External emergency stop setting error
The rotary switch setting for the external emergency stop does not match the parameter setting.
Investigation details Investigation results Remedies
CV CR
1 Check the rotary switch settings and
parameter settings.
When using external emergency stop:
• Add 0040h to the normal setting for SV036 or SP041, and set the power
supply's rotary switch to "4".
{
6. Troubleshooting
6 - 37
Alarm No.
77
Power module overheat
The power module's temperature protection function activated.
Investigation details Investigation results Remedies
CV CR
The fan is rotating, and an alarm did
not occur again.
Continue to use.
The power may be turned ON without
assuring more than 10 seconds for
the time from when the power is
turned OFF till when it is turned ON.
Leave for more than 10 seconds or
more, and turn the power ON again.
1 Turn the unit power ON again, and
confirm the rotation of the fan.
Note) Assure more than 10 seconds
for the time from when the
power is turned OFF till when it
is turned ON. For the fan used
for the drive unit, assuring
more than 10 seconds for the
time from when the power is
turned OFF till when it is turned
ON is required.
The fan did not rotate. Or, an alarm
occurred again.
Investigate item 2.
{
Large amounts of cutting oil or cutting
chips, etc., are adhered, or the
rotation is slow.
Clean or replace the fan. 2 Confirm that the fan is rotating
correctly.
The fan is rotating properly. Investigate item 3.
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Cutting oil or cutting chips, etc., are
adhered, and the fins are clogged.
Clean the fins. 3 Check whether the heat dissipating
fins are dirty.
The fins are normal. Investigate item 4.
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55°C or more Improve the ventilation and cooling
for the power distribution panel.
4 Measure the power supply unit's
ambient temperature.
Less than 55°C. Investigate item 5.
{
No abnormality is found in particular. If the alarm occurs even after the unit
temperature has dropped, replace
the unit.
5 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
An abnormality was found in the
ambient environment.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
{
Alarm No.
7F
Power reboot request
A mismatch in the program mode selection was detected. Turn the drive unit power ON again.
Investigation details Investigation results Remedies SV SP
1 Were the parameter settings
changed?
SV009, SV010, SV011, SV012
SV033/bit8, 9
This alarm is detected if the high-gain
specification parameters are set
when the drive unit is started up with
the standard specification software
mode, or if the standard specification
parameters are set when started up
with the high-gain specifications.
Turn the drive unit's control power
ON again.
{
Alarm No.
88
Watch dog
The system is not operating normally.
Investigation details Investigation results Remedies SV SP
The version was changed. Replace with a drive unit containing
the original software version.
1 Check whether the servo software
version was changed recently.
The version was not changed. Investigate item 2.
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The alarm is always repeated. Replace the drive unit. 2 Check the repeatability.
The state is returned to normal once,
but then the alarm occurs
occasionally.
Investigate item 3.
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No abnormality is found in particular. Replace the drive unit. 3 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
An abnormality was found in the
ambient environment.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
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