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
5E
SE
M EM OBUS/M odbus S elf Test Failed
C a u s e
P o s s ib le S o l u t i o n s
A digital input set to 67H (MEM OBUS/Modbus
test) was closed w hile the drive was running.
Stop the drive and run the test again.
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
1 r r L
TrPC
IGBT Maintenance Time (90%)
IGBTs have reached 90% o f their expected performance life.
N o t e :
This alarm w ill not trigger a m ulti-function output terminal that is set for alarm output (H 2 -D D = 10).
C a u s e
P o s s ib le S o l u t i o n s
IGBTs have reached 90% o f their expected
performance life.
Replace 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
i n 3
U
L
3
UL3
Undertorque Detection 1
Drive output current (or torque in OLV, CLV, CLV/PM) less than L 6-02 for longer than L 6-03 time.
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 L 6-02 and L6-03.
Load has dropped or decreased significantly.
Check for broken parts in the transmission system.
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
III и
U L 1
UL4
Undertorque Detection 2
Drive output current (or torque in OLV, CLV, CLV/PM) less than L 6-05 for longer than L 6-06 time.
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 L 6-05 and L6-06.
The load has dropped or decreased significantly.
Check for broken parts in the transmission system.
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
l l
L I U
U v
Undervoltage
One o f the follow ing conditions was true when the drive was stopped and a U p/D ow n command was entered:
• DC bus voltage dropped below the level specified in L2-05.
• Contactor to suppress inrush current in the drive was opened.
• L ow voltage in the control drive input power. This alarm outputs only if L2-01 is not 0 and DC bus voltage is under L2-05.
C a u s e
P o s s ib le S o l u t i o n s
Phase loss in the drive input power.
Check for wiring errors in the main circuit drive input power. Correct the wiring.
L oose wiring in the drive input power terminals.
• Ensure the terminals have been properly tightened.
• Apply the tightening torque to the terminals as specified. R efer to W ire G auges an d Tightening Torque on p a g e 56
There is a problem with the drive input power
voltage.
• Check the voltage.
• Lower the voltage o f the drive input power so that it is within the limits listed in the specifications.
Drive internal circuitry is worn.
• Check the maintenance tim e for the capacitors (U4-05).
• Replace either the control board or the entire drive if U 4-05 exceeds 90%. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
The drive input power transformer is too small and
voltage drops when the power is switched on.
• Check for an alarm when the magnetic contactor, line breaker, and leakage breaker are closed.
• Check the capacity o f the drive input power transformer.
Air inside the drive is too hot.
• Check the temperature inside the drive.
The CHARGE light is broken or disconnected.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest
sales representative.
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
u o f
voF
Output Voltage Detection Error
There is a problem with the output voltage.
C a u s e
P o s s ib le S o l u t i o n s
Hardware is damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest
sales representative.
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
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