Protective Functions - Vexta aStep AS Series Operating Manual

Note
・To clear the ALARM output, be
sure to remove the cause of
the problem that has triggered
the protective function before
either giving a one-shot ACL
input or turning the power back
on. After turning off the power,
wait at least 10 seconds before
turning the power back on.
・The overcurrent protection,
EEPROM data error and
system error protective
functions cannot be cleared.
When any of these functions
are triggered, contact the
nearest customer-service
center, branch or sales office.
46

Protective functions

This section covers the driver-protection functions and methods used to clear the triggered
function.
Warning
• When the driver-protection function is triggered, the motor will stop and
lose its holding torque, possibly causing injury or damage to equipment.
• When the driver's protection function is triggered, first remove the cause
and then clear the protection function. Continuing the operation without
removing the cause of the problem may cause malfunction of the motor,
leading to injury or damage to equipment.
Descriptions of protective functions and numbers of LED
blinks
The driver is provided with functions that protect the driver from ambient temperature increases,
improper power-source or motor-cable connections, and the occurrence of operating errors.
When a protective function is triggered, the ALARM LED on the front panel blinks, ALARM
output turns OFF, and simultaneously the motor current is shut off in order to stop the motor.
ALARM output remains "ON" when the driver is operating normally, then turns "OFF" when a
protective function is triggered. For details, refer to "ALARM output" on page 39.
1
0.2 s
ALARM LED blinking cycle (example: for overvoltage protection)
The number of ALARM LED blinks varies according to the nature of the triggered protective
function, thereby facilitating action and recovery from the abnormal conditions causing the
function to be triggered.
The table below gives descriptions of protective functions and their corresponding numbers of
blinks.
No. of blinks Protective function
1 Overheat protection
2 Overload protection
3 Overvoltage protection
4 Speed error protection
5 Overcurrent protection
6 Overspeed
EEPROM data error
7
8 Sensor error
Continuous System error
How to clear a protective function
When a driver-protection function is triggered, turning the ALARM output OFF by employing
either of the following methods may clear ALARM output (return to "ON"):
• Give a one-shot ACL (Alarm clear) input to clear the ALARM output.
• Turn the power back on.
OPERATION
Blink
ALARM
2 3
Interval
1.2 s
0.2 s
When a heat-radiating unit within the driver reaches
approx. 85°C.
When a load exceeding the maximum torque is applied
to the motor for five seconds or more.
When the driver inverter's primary voltage exceeds a
permissible value.
When the motor has not normally followed up on pulse
input.
When an excessive current flows through the driver
inverter's power element.
When the motor shaft speed exceeds 5000 r/min.
When the motor parameter in the driver is damaged.
When power turns on without the connection of a motor
cable to the driver.
When the driver is out of order.
1 2 3
Conditions