2.4 Protective Functions
2-42
Table 2.4-3
Name Description
LED
monitor
displays
Alarm
output
[30A/B/C]
(Note)
Tuning error
detection
During tuning of motor parameters, if the tuning has failed or has
been aborted, or an abnormal condition has been detected in the
tuning result, the inverter stops its output.
er7
Yes
RS-485
communications
error detection
(COM port 1)
When the inverter is connected to a communications network via the
RS-485 port designed for the keypad, detecting a communications
error stops the inverter output.
er8
Yes*
Excessive speed
deviation
*1 to *4
Stops the inverter output if the speed deviation (difference between
the speed command value and the feedback value) exceeds the
preset value.
ere
Yes*
Data save error
during under-
voltage
If the data could not be saved during activation of the undervoltage
protection function, the inverter displays the alarm code.
erf
Yes
Excessive
position
deviation
*1,*2,*4,*5
Stops the inverter output if the position deviation (difference
between the target position and the current position) exceeds the
preset value.
ero
Yes*
RS-485
communications
error detection
(COM port 2)
When the inverter is connected to a communications network via
the RS-485 port on the control terminals DX+ and DX-, detecting a
communications error stops the inverter output.
erp
Yes*
Hardware
error
Stops the inverter output upon detecting a malfunction of LSI on the
power printed circuit board, which is mainly caused by noise.
erh
Yes
Mock alarm Mock alarm can be generated with keypad operations.
err
Yes
PID feedback
wire break
When the PID feedback is assigned to the current input, if a wire
break is detected, either the warning with transistor output or the
alarm output can be selected.
cof
Yes*
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 pressing the
key or 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
Stall prevention When the output current exceeds the current limiter level during
acceleration/deceleration or constant speed running, this function
decreases the output frequency to avoid an overcurrent trip.
-
-
Retry When the inverter has stopped because of a trip, this function allows
the inverter to automatically reset itself and restart. (You can specify
the number of retries and the latency between stop and reset.)
- -
Surge protection Protects the inverter against surge voltages which might appear
between one of the power lines for the main circuit and the ground.
- -
Command loss
detected
Upon detecting a loss of a frequency command (because of a
broken wire, etc.), this function issues an alarm and continues the
inverter operation at the preset reference frequency (specified as a
ratio to the frequency just before the detection).
ref
-
Protection
against
momentary
power failure
Upon detecting a momentary power failure lasting more than 15 ms,
this function stops the inverter output.
If restart after momentary power failure is selected, this function
invokes a restart process when power has been restored within a
predetermined period (allowable momentary power failure time).
- -
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