Alarm Detection; Alarm Detection; Alarm Codes, Causes, And Possible Solutions - YASKAWA Z1000 User Manual

5.5 Alarm Detection

5.5

Alarm Detection

u

Alarm Codes, Causes, and Possible Solutions

Alarms are drive protection functions that do not necessarily cause the drive to stop. After removing the cause of an alarm,
the drive will return to the same status is was before the alarm occurred.
When an alarm has been triggered, the ALM light on the HOA keypad display blinks and the alarm code display flashes. If a
multi-function output is set for an alarm (H2-oo = 10), that output terminal will be triggered.
Note: If a multi-function output is set to close when an alarm occurs (H2-oo = 10), it will also close when maintenance periods are reached,
triggering alarms LT-1 through LT-4 (triggered only if H2-oo = 2F).
Digital Operator: Hand Off Auto (HOA) Keypad JVOP-183
TERMS TERMS
Digital Operator Display
Cause
External baseblock signal was entered via
one of the multi-function input terminals
(S1 to S7).
Digital Operator Display
Cause
The proper braking resistor has not been
installed.
Use a regen converter, regen unit, braking
unit, or other device to connect the +1 or +3
terminal to the - terminal.
The braking transistor's use rate is high
(i.e., the regen converter is large or the
repetition frequency is high).
The braking transistor inside the drive is
faulty.
Digital Operator Display
Cause
Connection is broken or master controller
stopped communicating.
Option is damaged.
The option is not properly connected to the
drive.
A data error occurred due to noise.
216
Table 5.11 Alarm Codes, Causes, and Possible Solutions
Baseblock
bb
Drive output interrupted as indicated by an external baseblock signal.
Check external sequence and baseblock signal input timing.
Note: Baseblock alarm "bb" will not activate a digital output programmed for minor fault
H2-0o = 10. Set H2-0o = 8 or 1B to activate a digital output for "bb".
Braking Transistor Overload Fault
boL
The braking transistor in the drive has been overloaded.
Select the proper braking resistor.
Set L8-55 to 0 to disable Internal Braking Transistor Protection.
• Change to a CDBR type braking unit.
• Change to a regen converter.
• Increase the deceleration time.
Replace the drive.
Option Communication Error
bUS
• The connection was lost after initial communication was established.
• Assign a Run command frequency reference to the option.
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits. Repair as needed.
If there are no problems with the wiring and the fault continues to occur, replace the option.
• The connector pins on the option are not properly lined up with the connector pins on the drive.
• Reinstall the option.
• Check options available to minimize the effects of 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.
• Use surge absorbers on magnetic contactors or other equipment causing the disturbance.
• Use recommended cables or some other type of shielded line. Ground the shield to the controller side or
on the input power side.
• Separate the wiring for communication devices from the drive input power lines. Install an EMC noise
filter to the drive input power.
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
YASKAWA TOEP YAIZ1U 03B YASKAWA AC Drive – Z1000 User Manual