Motor Controllers AC Variable Frequency Drives
RVBS
Specifications are subjected to change without notice.10/08/2021
44
5.3
Alarm map
Name
Description
Alarm code
Alarm
output [30A,
B, C]
Overcurrent
protection
Short-circuit
protection
Ground
fault
protection
- Stops the inverter output to protect the inverter
from an overcurrent resulting from overload.
- Stops the inverter output to protect the inverter
from an overcurrent due to a short circuit in the
output circuit.
- Stops the inverter output to protect the inverter from
an overcurrent due to a ground fault in the output
circuit. This protection is effective only when the
inverter starts. If you turn on the inverter without
removing the ground fault, this protection may not
work.
During
acceleration
During
deceleration
During running
at constant
speed
OC1
OC2
OC3
Yes
Overvoltage
protection
Stops the inverter output upon detection of
overvoltage (400 VDC for 200 V series) in the DC link
bus.
This protection is not assured if excess AC line
voltage is applied inadvertently.
During
acceleration
During
deceleration
During running
at constant
speed
(Stopped)
OU1
OU2
OU3
Yes
Under
voltage
protection
Stops the inverter output when the DC link bus voltage drops below
the under-voltage level (200 VDC for 200 V series).
However, when F12 = 4 or 5, no alarm is output even if the DC link bus
voltage drops.
LU
Yes
(Note)
Output phase loss
protection
Detects breaks in inverter output wiring at the start of running and
during running, stopping the inverter output.
OPL
Yes
Overheat
protection
-
heatsink
- Stops the inverter output upon detecting excess heat sink
temperature in case of cooling fan failure or overload.
OH1
Yes
Overload
protection
Stops the inverter output according to the inverter heat sink
temperature and the switching element temperature calculated from
the output current.
OLU
Yes
Electronic thermal
overload relay
Stops the inverter output in accordance with the setting of the
electronic thermal overload relay to protect the motor.
This function protects general-purpose motors and inverter motors
over the entire frequency range.
* The operation level and thermal time constant (0.5 to 75.0
minutes) can be set.
OL1
Yes
Stall prevention
Operates if the inverter's output current exceeds the instantaneous
overcurrent limit level, avoiding tripping of the inverter (during constant
speed operation or during acceleration).
—
—
Alarm
relay
output
(for any fault)
The inverter outputs a relay contact signal when the inverter issues an
alarm and stops the inverter output.
< Alarm Reset >
The alarm stop state is reset by the digital input signal
RST
.
< Saving the alarm history and detailed data >
The information on the previous 4 alarms can be saved and displayed.
—
Yes
Memory error
The inverter checks memory data after power-on and when the data
is written. If a memory error is detected, the inverter stops.
Er1
Yes
CPU error
If the inverter detects a CPU error caused by noise or some other
factor, the inverter stops.
Er3
Yes
Tuning error
Stops the inverter output when a tuning failure, interruption, or
abnormal tuning result is detected during tuning of motor parameters.
Er7
Yes
RS-485
communication
error
Upon detection of an RS-485 communications error, the inverter stops
its output.
Er8
Yes
