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4.11
Disconnection/incorrect wiring detection function
Output open phase detection function
This function detects an open phase due to servo motor power supply cable (U/V/W) disconnection and generates [AL. 139
Open phase error] after the detection.
Restrictions
• The output open phase detection function will be disabled if an alarm or warning other than [AL. 139 Open phase error] has
occurred.
• If "1" is set in [Pr. PC05.0 Motor-less operation selection], output open phase will not be detected even if the output open
phase detection function has been enabled.
• If "0" (servo motor speed) is set in [Pr. PC19.6 Output open phase - Judgment speed selection], [AL. 139 Open phase error]
will only be detected in the servo-on state while the servo motor speed is 50 [r/min] or faster. The output open phase will not
be detected even if the open phase of the servo motor power supply (U/V/W) occurs while in the servo-off state or if the
servo motor speed is under 50 [r/min].
• If "1" (speed command) is set in [Pr. PC19.6 Output open phase - Judgment speed selection], [AL. 139 Open phase error]
will only be detected in the servo-on state while the command speed is 50 [r/min] or faster. The output open phase will not
be detected even if the open phase of the servo motor power supply (U/V/W) occurs while in the servo-off state or if the
command speed is under 50 [r/min].
• The output open phase detection is not performed when the MBR is on.
• If "1" (speed command) is set in [Pr. PC19.6 Output open phase - Judgment speed selection], the output open phase may
be detected incorrectly when the servo motor axis is stopped due to a collision or similar impact.
• If [Pr. PA11 Forward rotation torque limit] and [Pr. PA12 Reverse rotation torque limit] are 10.0 % or less, the output open
phase may be detected incorrectly when the servo motor load becomes large.
Precautions
• With the output open phase detection function, detection is possible only when one of the U, V, or W phases is an open
phase.
Setting method
When [Pr. PC19.4 Output open-phase detection selection] is set to "1" (Enabled), the output open-phase detection function
will be enabled.
Servo parameter
Symbol
PC19.4
*COP6
PC19.6
*COP6
4.12
Overload protection (electronic thermal) function
An electronic thermal is built in the servo amplifier to protect the servo motor, servo amplifier and servo motor power wires
from overloads.
[AL. 050 Overload 1] occurs if overload operation performed is above the electronic thermal protection curve. [AL. 051
Overload 2] occurs if the maximum current is applied continuously for several seconds due to machine collision, etc.
Precautions
• After [AL. 050 Overload 1] and [AL. 051 Overload 2] occurs, allow about 30 minutes of cooling time.
Name
Output open-phase detection
selection
Output open phase - Judgment
speed selection
Outline
Enable or disable the detection of output open phase.
0: Disabled (initial value)
1: Enabled
Select the judgment speed of the output open phase detection function.
0: Servo motor speed (initial value)
1: Speed command
In the torque control, set "0" (Servo motor speed). If "1" (Speed
command) is set, [AL. 139.2 Output open phase error] will not be
detected.
4 APPLICABLE FUNCTIONS
4.11 Disconnection/incorrect wiring detection function
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