6.4 Alarm Detection
D i g i t a l O p e r a t o r D i s p l a y
M i n o r F a u l t N a m e
oH
oH
Heatsink Overheat
The temperature o f the heatsink exceeded the overheat pre-alarm level set to L 8-02 (90-100 °C). Default value for L 8-02 is
determined by drive capacity (o2-04).
C a u s e
P o s s ib le S o l u t i o n s
Surrounding temperature is too high
• Check the surrounding temperature.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool surrounding area.
• Rem ove anything near drive that may cause extra heat.
Internal cooling fan has stopped.
• Replace the cooling fan. R efer to C ooling Fan C om pon en t N a m es on p a g e 2 7 7 .
• After replacing the drive, reset the cooling fan maintenance parameter to (o4-03 = “0 ”).
A irflow around the drive is restricted.
• Provide proper installation space around the drive as indicated in the manual. R efer to Installation O rientation a n d S p a cin g on
p a g e 3 5 .
• A llow for the specified space and ensure that there is sufficient circulation around the control panel.
• Check for dust or foreign materials clogging cooling fan.
• Clear debris caught in the fan that restricts air circulation.
D i g i t a l O p e r a t o r D i s p l a y
M i n o r F a u l t N a m e
oL3
oL3
Overtorque Detection 1
Drive output current (or torque in OLV, CLV, CLV/PM) was greater than L6-02 for longer than the time set in L6-03.
C a u s e
P o s s ib le S o l u t i o n s
Inappropriate parameter settings.
Check parameters L6-02 and L6-03.
There is a fault on the machine side (e.g ., the
machine is locked up).
• Check the status o f the machine.
• Rem ove the cause o f the fault.
D i g i t a l O p e r a t o r D i s p l a y
M i n o r F a u l t N a m e
Г
Г
—
I
О
oL4
Overtorque Detection 2
Drive output current (or torque in OLV, CLV, CLV/PM) was greater than L6-05 for longer than the time set in L6-06.
C a u s e
P o s s ib le S o l u t i o n s
Parameter settings are not appropriate.
Check parameters L6-05 and L6-06.
There is a fault on the machine side (e.g ., the
machine is locked up).
• Check the status o f the machine being used.
• Rem ove the cause o f the fault.
D i g i t a l O p e r a t o r D i s p l a y
M i n o r F a u l t N a m e
o5
oS
Overspeed (for Control M ode with Encoder)
The motor speed feedback exceeded the F1-08 setting.
C a u s e
P o s s ib le S o l u t i o n s
Inappropriate parameter settings.
Check the setting for the overspeed detection level and the overspeed detection tim e (F1-08 and F1-09).
D i g i t a l O p e r a t o r D i s p l a y
M i n o r F a u l t N a m e
O u
ov
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V
C a u s e
P o s s ib le S o l u t i o n s
Surge voltage present in the drive input power.
• Install a DC reactor or an AC reactor.
• Voltage surge can result from a thyristor convertor and a phase advancing capacitor operating on the same drive input power system.
The motor is short-circuited.
• Check the motor power cable, relay terminals and motor terminal box for short circuits.
• Correct grounding shorts and turn the power back on.
Ground current has over-charged the main circuit
capacitors via the drive input power.
N oise interference causes the drive to operate
incorrectly.
• R eview possible solutions for handling noise interference.
• R eview section on handling noise interference and check control circuit lines, main circuit lines and ground wiring.
• If the magnetic contactor is identified as a source o f noise, install a surge protector to the MC coil.
Set number o f fault reset (L 5-01) to a value other than 0.
Encoder cable is disconnected.
Reconnect the cable.
Encoder cable wiring is wrong.
Correct the wiring.
N oise interference along encoder wiring.
Separate encoder wiring from the source o f the noise (often output wiring from the drive).
D i g i t a l O p e r a t o r D i s p l a y
M i n o r F a u l t N a m e
PR55
PASS
MEM OBUS/M odbus Communication Test M ode Complete
C a u s e
P o s s ib le S o l u t i o n s
MEM OBUS/M odbus test has finished normally.
This verifies that the test was successful.
D i g i t a l O p e r a t o r D i s p l a y
M i n o r F a u l t N a m e
Puo
PGo
Encoder D isconnected (for Control M ode w ith Encoder)
Detected when no encoder signal is received for a tim e longer than setting in F1-14.
C a u s e
P o s s ib le S o l u t i o n s
Encoder cable is disconnected.
Reconnect the cable.
Encoder cable wiring is wrong.
Correct the wiring.
Encoder does not have enough power.
Make sure the correct power supply is properly connected to the encoder.
Motor brake is not released.
Ensure the brake releases properly
D i g i t a l O p e r a t o r D i s p l a y
M i n o r F a u l t N a m e
PuoH
PGoH
Encoder D isconnected (detected when using an encoder)
Encoder cable has becom e disconnected.
C a u s e
P o s s ib le S o l u t i o n s
Encoder cable is disconnected.
Reconnect the cable.
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual