Disconnection/Incorrect Wiring Detection Function; Output Open Phase Detection Function - Mitsubishi Electric Melservo-Jet MR-JET-G Series User Manual

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] (linear servo motor: 50 [mm/s]) 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 too 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 Symbol
parameter
PC19.4 *COP6
PC19.6 *COP6
4 APPLICABLE FUNCTIONS
138
4.11 Disconnection/incorrect wiring detection function
Name
Output open-phase detection selection
Output open phase - Judgment speed
selection
Outline
Enable or disable the detection of output open-phase detection function.
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). When "1" (speed command) is set,
[AL. 139.2 Output open-phase error] does not occur.