Disconnection/Incorrect Wiring Detection Function; Input Open-Phase Detection Function - Mitsubishi Electric MELSERVO-J5 Series User Manual

4.18

Disconnection/incorrect wiring detection function

An alarm may occur if the main circuit power supply (L1/L2/L3) is an open phase, and the servo motor load becomes too
large. Also, when an open phase has occurred in the servo motor power supply (U/V/W) or the power module has
malfunctioned, an overcurrent alarm or overload alarm occurs. These malfunctions are difficult to determine from the outside
of the servo amplifier, making it difficult to identify the alarm cause.
With the following function, the MELSERVO-J5 series servo amplifier can quickly identify the malfunction location and shorten
the time needed to restore the device.

Input open-phase detection function

This function detects an open phase of the main circuit power supply (L1/L2/L3) of the servo amplifier and generates [AL. 139
Open-phase error] or [AL. 1E9 Open-phase warning] upon open phase detection. This function detects an open phase only
for 1-phase of the main circuit power supply (L1/L2/L3) of the servo amplifier. The function does not detect an open phase if
the open phase of the main circuit power supply (L1/L2/L3) of the servo amplifier occurs on two or all phases at the same
time.
Restrictions [G] [WG]
• [AL. 1E9 Open-phase warning] and [AL. 139 Open-phase error] are only detected in the servo-on state. In the servo-off
state, [AL. 1E9 Open-phase warning] and [AL. 139 Open-phase error] do not occur even if an open phase of the main
circuit power supply (L1/L2/L3) of the servo amplifier occurs.
• When using 1-phase AC input or DC input, the input open-phase detection function cannot be used. For 1-phase AC input
and DC input, set [Pr. PC20.4 Input open-phase detection selection] to "2" (warning enabled) or "3" (alarm enabled) and
even if an open phase occurs during servo-on, [AL. 1E9 Open-phase warning] and [AL. 139 Open-phase error] do not
occur.
• When using the input open-phase detection function with [Pr. PA02.1-0 Regenerative option selection] being set to "01" FR-
XC-(H), set [Pr. PC20.4] to "1" (warning enabled) or "2" (alarm enabled). However, when the FR-XC-(H) is used, the input
open-phase detection function cannot be used.
Restrictions [A]
• [AL. 1E9 Open-phase warning] and [AL. 139 Open-phase error] are only detected in the servo-on state. In the servo-off
state, [AL. 1E9 Open-phase warning] and [AL. 139 Open-phase error] do not occur even if an open phase of the main
circuit power supply (L1/L2/L3) of the servo amplifier occurs.
• When using 1-phase AC input or DC input, the input open-phase detection function cannot be used. For 1-phase AC input
and DC input, set [Pr. PC27.4 Input open-phase detection selection] to "2" (warning enabled) or "3" (alarm enabled) and
even if an open phase occurs during servo-on, [AL. 1E9 Open-phase warning] and [AL. 139 Open-phase error] do not
occur.
• When using the input open-phase detection function with [Pr. PA02.1-0 Regenerative option selection] being set to "01" FR-
XC-(H), set [Pr. PC27.4] to "1" (warning enabled) or "2" (alarm enabled). However, when the FR-XC-(H) is used, the input
open-phase detection function cannot be used.
Precautions
• If the main circuit power supply (L1/L2/L3) is input while other than "0" (disabled (simple converter not used)) is set in [Pr.
PA02.4 Simple converter selection], the input open-phase detection function will generate an alarm or a warning. When
using the simple converter, do not input main circuit power supply (L1/L2/L3).
4 APPLICABLE FUNCTIONS
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4.18 Disconnection/incorrect wiring detection function