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Protective Functions
Protective
Functions
Overcurrent protection
The inverter is stopped for protection against overcurrent.
Short circuit protection
The inverter is stopped for protection against overcurrent caused by a short circuit in the output circuit.
Grounding fault
The inverter is stopped upon start-up for protection against overcurrent caused by a grounding fault in the output circuit.
protection
If the power supply is turned on with the grounding fault, the inverter and the controlled equipment may not be protected.
Overvoltage
An excessive voltage (3-phase and Single-phase 230V series: 400V DC, 3-phase 460V series: 800V DC)
protection
in the DC link circuit is detected and the inverter is stopped. If an excessive voltage is applied by mistake,
the protection cannot be guaranteed.
Undervoltage
The voltage drop (3-phase 230V series: 200V DC, 3-phase 460V series: 400V DC) in the DC link circuit is detected to stop the inverter.
protection
However, when "F14: 3, 4 or 5" is selected, an alarm is not issued even upon a voltage drop in the DC link circuit.
Input phase loss
The input phase loss is detected to shut off the inverter output. This function protects the inverter from being damaged by adding
protection
extreme stress caused by a power phase loss or imbalance between phases. When the load to be connected is small or
DC REACTOR is connected a phase loss is not detected.
Output phase loss protection
Detects breaks in inverter output wiring at the start of operation and during running, to shut off the inverter output.
Overheating
Stops the inverter output upon detecting excess heat sink temperature in case of cooling fan failure or overload.
protection
Discharging and inverter operation are stopped due to overheating of an external braking resistor.
* Function codes must be set corresponding to the braking resistor.
Overload protection
The temperature inside the IGBT is calculated from the detection of output current and internal temperature, to shut off the inverter output.
External alarm input
With the digital input signal (THR) opened, the inverter is stopped with an alarm.
The inverter is stopped with an electronic thermal function set to protect the motor.
Electronic
thermal
• The standard motor is protected at all the frequencies.
• The inverter motor is protected at all the frequencies.
*The operation level and thermal time constant can be set.
PTC thermistor A PTC thermistor input stops the inverter to protect the motor.
• The PTC thermistor is connected between terminals C1 and 11 to set switches and function codes on the control PC board.
Overload early
Warning signal is output at the predetermined level before stopping the inverter with the electronic thermal function to protect the
warning
motor.
This is protected when the instantaneous overcurrent limit works.
Stall prevention
• Instantaneous overcurrent limit: Operates when the inverter output current goes beyond the instantaneous overcurrent limiting level,
and avoids tripping (during acceleration and constant speed operation).
Alarm relay output
The relay signal is output when the inverter stops upon an alarm.
(for any fault)
<Alarm reset>
The
key or digital input signal (RST) is used to reset the alarm stop state.
<Storage of alarm history and detailed data>
Up to the last 4 alarms can be stored and displayed.
Data is checked upon power-on and data writing to detect any fault in the memory and to stop the inverter if any.
Memory error
Keypad
The keypad (standard) or multi-function keypad (optional) is used to detect a communication fault between the keypad and inverter
communication error
main body during operation and to stop the inverter.
CPU error
Detects a CPU error or LSI error caused by noise.
Option communication error When each option card is used, a fault of communication with the inverter main body is detected to stop the inverter.
Option error
When each option card is used, the option card detects a fault to stop the inverter.
STOP key priority:
Start check:
Operation error
When tuning failure, interruption, or any fault as a result of turning is detected while tuning for motor constant.
Tuning error
RS-485
When the connection port of the keypad connected via RS-485 communication port to detect a communication error, the inverter is
communication error
stopped and displays an error.
Data save error upon Undervoltage When the undervoltage protection works, an error is displayed if data cannot be stored.
RS-485 communication
When an optional RS-485 communication card is used to configure the network, a fault of communication with the inverter main body
error (optional)
is detected to stop the inverter.
When the inverter is tripped and stopped, this function automatically resets the tripping state and restarts operation.
Retry
(The number of retries and the length of wait before resetting can be set.)
Surge protection
The inverter is protected against surge voltage intruding between the main circuit power line and ground.
Command loss
A loss (broken wire, etc.) of the frequency command is detected to output an alarm and continue operation at the preset frequency
detection
(set at a ratio to the frequency before detection).
An error displays when the signal line for PG is disconnected while the PG feedback card is installed.
PG disconnection
• A protective function (inverter stoppage) is activated upon a momentary power failure for 15msec or longer.
Momentary power
failure protection
• If restart upon momentary power failure is selected, the inverter restarts upon recovery of the voltage within the set time.
Overload avoidance
The inverter output frequency is reduced to avoid tripping before heat sink overheating or tripping due to an overload
control
(alarm indication:
The inverter is stopped when poor connection between the control board and power source board or interface board, or short-circuit
Hardware error
between terminals between 13 and 11 is detected.
Simulated alarm is output to check the fault sequence.
Simulation error
▲
Note: The item indicated with
in the alarm output (30A, B, C) column may not be issued according to some function code settings.
Description
Pressing the
key on the keypad or entering the digital input signal will forcibly decelerate and stop the
motor even if the operation command through signal input or communication is selected.
Start check: If the operation command is entered in the following cases,
LED monitor to prohibit operation.
• Power-on
• Alarm reset (
key ON or alarm (error) reset [RST] is reset.)
• The link operation selection "LE" is used to switch operation.
or
.
LED
Alarm output
indication
(30A, B, C) Note)
During acceleration
During deceleration
During constant
speed operation
During acceleration
During deceleration
During constant speed operation
-
-
-
will be displayed on the
-
-
-
-
-
Related
function code
●
●
▲
F14
●
H98
●
H98
●
H43, H98
●
●
●
E01 to E05
E98, E99
●
F10,A06
F11,F12,A07,A08
●
H26,H27
-
E34,E35
-
H12
●
E20,E21,E27
E01 to E05
E98,E99
●
●
F02
●
-
-
●
H96
●
P04
●
●
●
-
H04,H05
-
-
E65
●
-
F14
H13 to H16
-
H70
●
●
H45
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