Alarm Detection; Alarm Detection; Alarm Codes, Causes, And Possible Solutions - YASKAWA L1000V Technical Manual

6.4

Alarm Detection

u Alarm Codes, Causes, and Possible Solutions
Alarms are drive protection functions that do not necessarily cause the drive to stop. Once the cause of 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 (H2-
alarms. Refer to Minor Faults and Alarms on page 168
Note: If a multi-function output is set to close when an alarm occurs (H2-
reached, triggering alarms LT-1 through LT-4 (triggered only if H2-
Digital Operator Display
Cause
External baseblock signal was entered via one of the
multi-function input terminals (S3 to S7).
Digital Operator Display
boL
Cause
The proper braking resistor has not been installed.
Digital Operator Display
Digital Operator Display
CrST
Cause
A fault reset command was entered while the Up/
Down command was still present.
Digital Operator Display
dEv
Cause
Load is too heavy
Accel/decel ramp is too short.
The load is locked up.
Parameter settings are inappropriate.
The motor brake is not applied.
Digital Operator Display
Cause
Sequence error
Digital Operator Display
EF3
EF4
EF5
EF6
EF7
Cause
An external device has tripped an alarm function.
Wiring is incorrect.
Multi-function contact inputs are set incorrectly.
YASKAWA EUROPE SIEP
Table 6.8 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.
Braking Transistor Overload
The braking transistor in the drive has been overloaded.
Select the optimal braking resistor.
Cannot Reset
• Ensure that a Up/Down command cannot be entered from the external terminals or option card during fault reset.
• Turn off the Up/Down command.
Speed Deviation (for simple PG feedback control modes)
The deviation between the speed reference and speed feedback is greater than the setting in F1-10 for longer than the time in F1-11.
Reduce the load.
Increase the acceleration and deceleration times (C1-01 through C1-08).
Check the machine.
Check the settings of parameters F1-10 and F1-11.
Ensure the motor brake operates properly with a brake control command from the drive.
Up/Down Command Error
EF
Both forward run and reverse run closed simultaneously for over 0.5 s.
Check the forward and reverse command sequence and correct the problem.
Note: When minor fault EF detected, motor ramps to stop.
External fault (input terminal S3)
External fault at multi-function input terminal S3.
External fault (input terminal S4)
External fault at multi-function input terminal S4.
External fault (input terminal S5)
External fault at multi-function input terminal S5.
External fault (input terminal S6)
External fault at multi-function input terminal S6.
External fault (input terminal S7)
External fault at multi-function input terminal S7.
Remove the cause of the external fault and reset the multi-function input value.
• Ensure the signal lines have been connected properly to the terminals assigned for external fault detection (H1-
• Reconnect the signal line.
• Check if the unused terminals have been set for H1-
• Change the terminal settings.
YASKAWA AC Drive L1000V Technical Manual
= 10), that output terminal will be triggered for certain
for information on alarm that trigger an alarm output.
= 10), it will also close when maintenance periods are
= 2F).
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
= 20 to 2F (External Fault).

6.4 Alarm Detection

= 20 to 2F).
177
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