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6.4 Alarm Detection

♦ Alarm Codes, Causes, and Possible Solutions

Alarms are drive protection functions that do not necessarily cause the drive to stop. Once the cause o f an alarm is

removed, the drive will return to the same status as before the alarm occurred.

When an alarm has been triggered, the ALM light on the digital operator display blinks and the alarm code display

flashes. If a multi-function output is set for an alarm (H 2-DD = 10), that output terminal will be triggered for certain
alarms.

Refer to Minor Faults and Alarms on page 238

for information on alarm that trigger an alarm output.

Note: I f a m ulti-function output is set to close w hen an alarm occurs (H 2 -D D = 10), it will also close w hen m aintenance periods are

reached, triggering alarms LT-1 through LT-4 (triggered only i f Н 2-СЮ = 2F).

Table 6.9 Alarm Codes, Causes, and Possible Solutions

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

REr

AEr

Communication Option N ode ID Setting Error (CANopen)

Option card node address is outside the acceptable setting range.

C a u s e

P o s s ib le S o l u t i o n s

Station number is set outside the possible setting

range.

Set parameter F6-35 to the proper value if a CANopen option card is used.

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

Baseblock

Drive output interrupted as indicated by an external baseblock signal.

C a u s e

P o s s ib le S o l u t i o n s

External baseblock signal was entered via one o f the

m ulti-function input terminals (S3 to S8).

Check external sequence and baseblock signal input timing.

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

b o i

boL

Braking Transistor Overload

The braking transistor in the drive has been overloaded.

C a u s e

P o s s ib le S o l u t i o n s

The proper braking resistor has not been installed.

Select the optimal braking resistor.

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

bus

bUS

Option Communication Error

• After initial communication was established, the connection was lost.
• A ssign a U p/Dow n command or speed reference to the option card.

C a u s e

P o s s ib le S o l u t i o n s

Connection is broken or master controller stopped

communicating.

•  Check for faulty wiring.
•  Correct the wiring.
•  Check for disconnected cables  and short circuits.  Repair as needed.

Option card is damaged.

If there are no problems w ith the wiring and the fault continues to occur, replace the option card.

The option card is not properly connected to the

drive.

• The connector pins on the option card are not properly lined up with the connector pins on the drive.
• Reinstall the option card.

A data error occurred due to noise.

•  Check options  available to m inim ize the effects o f  noise.
•  Take steps to  counteract noise in the  control circuit wiring,  main circuit lines  and ground wiring.
•  Try to reduce noise on the  controller side.

•  U se surge absorbers  on magnetic  contactors  or other equipment causing the disturbance.
•  U se recommended cables  or som e other type  o f shielded line.  Ground the shield to the  controller side or on the input power side.
•  A ll wiring for comm.  devices  should be separated from drive input power lines.  Install an EMC noise filter to the drive input power.

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

r o t l

L O L L

CALL

Serial Communication Stand By

Communication has not y et been established.

C a u s e

P o s s ib le S o l u t i o n s

Communications wiring is faulty, there is a short

circuit, or something is not connected properly.

•  Check for wiring  errors.
•  Correct the wiring.
•  Check for disconnected cables  and short circuits.  Repair as needed.

Programming error on the master side.

Check communications at start-up and correct programming errors.

Communications circuitry is damaged.

• Perform a self-diagnostics check.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing the control board, contact

Yaskawa or your nearest sales representative.

Termination resistor setting is incorrect.

A termination resistor must be installed at both ends o f a communication line. Slave drives must have the internal termination resistor

switch set correctly. Place DIP switch S2 to the ON position.

YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual

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