Protective functions
37
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8
Protective functions
This section covers the driver-protection functions and methods used to clear the triggered function.
8-1
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-
supply or motor-cable connections, and the occurrence of operating errors. When a protective function is triggered,
the ALARM LED on the front panel blinks, the ALARM output turns OFF, and simultaneously the lineard motor current
is shut off in order to stop the lineard motor.
The 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 p.32.
1
2
3
1
2
3
Interval
1.2 s
0.2 s
0.2 s
Blink
•
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 cannot be cleared using the ACL
input. Clear these errors by cycling the power. If the problem persists, please contact the nearest
Oriental Motor office.
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.
ALARM LED
No. of blinks
Function
Description
Action if problem is found
1
Overheat
protection
When the temperature of the heat sink
inside the driver has reached approx.
85 °C (185 °F).
Check the operating condition of the lineard
motor and the ventilation condition inside the
enclosure.
2
Overload
protection
When a load exceeding the maximum
torque is applied to the rack for five
seconds or more.
Reduce the load of rack.
3
Overvoltage
protection
When the voltage on the primary side
of the driver inverter has exceeded the
permissible value.
•
Check the connection with the power supply.
•
When the motor is used in a lift, reduce the load.
4
Speed error
protection
When the lineard motor has not
normally followed up on pulse input.
Reduce the load. Or, decrease the speed filter
setting.
5
Overcurrent
protection
When an excessive current flows
through the driver inverter’s power
element.
Turn off the driver power and check the motor
cable and its connection to the driver, and then
reconnect the power.
6
Overspeed
The rack speed exceeded the maximum
speed (refer to the next page for the
maximum speed).
Set the operating speed to a value not exceeding
the maximum speed.
7
EEPROM data
error
When the lineard motor parameter in
the driver is damaged.
Turn off the driver power, and then cycle the
power. If the problem persists, contact your
nearest Oriental Motor office.
8
Sensor error
When power turns on without the
connection of a motor cable to the
driver.
Turn off the driver power and check the motor
cable and its connection to the driver, and then
reconnect the power.
ALARM LED
turns on.
System error
When the driver is out of order.
Turn off the driver power, and then cycle the
power. If the problem persists, contact your
nearest Oriental Motor office.
