SMC Networks LECSN-T Series User Manual

8. TROUBLESHOOTING
8 - 15
Alarm No.: 10
Name: Undervoltage
Alarm content
The voltage of the control circuit power supply has dropped.
The voltage of the main circuit power supply has dropped.
Detail
No.
Detail name
Cause
Check method
Check result
Action
10.1
Voltage drop in
the control
circuit power
(1)
The control circuit power
supply connection is
incorrect.
Check the connection
of the control circuit
power supply.
It has a failure.
Connect it correctly.
It has no failure.
Check (2).
(2)
The voltage of the
control circuit power
supply is low.
Check if the voltage
of the control circuit
power supply is
lower than
prescribed value.
160 V AC
The voltage is the
prescribed value or
lower.
Review the voltage of the
control circuit power supply.
The voltage is
higher than the
prescribed value.
Check (3).
(3)
The power was cycled
before the internal
control circuit power
supply stopped.
Check if the power has
a problem.
It has a problem.
Cycle the power after the
seven-segment LED of
the driver is turned off.
It has no problem.
Check (4).
(4)
An instantaneous power
failure has occurred for
longer time than the
specified time.
The time will be 60 ms
when [Pr. PA20] is "_ 0
_ _".
The time will be the
value set in [Pr. PF25]
when [Pr. PA20] is "_ 1
_ _".
The time will be 60 ms
when [Pr. PX25] is "_ 0
_ _" and the J3
extension function is
used. The time will be
the value set in [Pr.
PX28] when [Pr. PX25]
is "_ 1 _ _".
Check if the power has
a problem.
It has a problem.
Review the power.
It has no problem.
Check (5).
(5)
When a power
regeneration converter
is used, the voltage of
the control circuit power
supply is distorted.
Check if the power has
a problem.
When power supply
impedance is high,
power supply voltage
will be distorted due to
current at power
regeneration, and it
may be recognized as
undervoltage.
It has no problem.
Review the setting of
"[AL. 10 Undervoltage]
detection method
selection" with the
following parameters.
[Pr. PC27]
10.2
Voltage drop in
the main circuit
power
(1)
The main circuit power
supply wiring was
disconnected.
For the drive unit, the
main circuit power
supply wiring of the
converter unit was
disconnected.
Check the main circuit
power supply wiring.
Check the main circuit
power supply wiring of
the converter unit.
It is disconnected.
Connect it correctly
It is connected.
Check (2).
(2)
The wiring between P3
and P4 was
disconnected.
For the drive unit, the
wiring between P1 and
P2 of the converter unit
was disconnected.
Check the wiring
between P3 and P4.
Check the wiring
between P1 and P2 of
the converter unit.
It is disconnected.
Connect it correctly.
It is connected.
Check (3).
(3)
For the drive unit, the
Check the magnetic
It is disconnected.
Connect it correctly.

SMC Networks LECSN-T Series Specifications

General

Brand	SMC Networks
Model	LECSN-T Series
Category	Controller
Language	English