Protective Functions - ADT iMaster-U1 Instruction Manual

8.3 Protective Functions

Name
Overcurrent - Stops the inverter output to protect the
protection inverter from an overcurrent resulting from
overload.
Short-circuit
protection - Stops the inverter output to protect the
inverter from an overcurrent due to a short
Ground fault
circuit in the output circuit.
protection
- 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.
Overvoltage Stops the inverter output upon detection of
protection overvoltage (400 VDC for 200 V series and 800
VDC for 400 V series) in the DC link bus.
This protection is not assured if excess AC line
voltage is applied inadvertently.
Under voltage Stops the inverter output when the DC link bus voltage
protection drops below the under voltage level (200 VDC for 200 V series
and 400VDC for 400 V series).
However, when F14 = 4 or 5, no alarm is output even if the DC link
bus voltage drops.
Input phase loss Detects input
protection
This function prevents the inverter from undergoing heavy
stress that may be caused by input phase loss or inter-phase
voltage unbalance and may damage the inverter.
If connected load is light or a DC reactor is connected to the
inverter, this function may not detect input phase loss if any.
In single-phase series of inverters, this function is disabled by
factory default.
Output phase Detects breaks in inverter output wiring at the start of running and
loss protection during running, stopping the inverter output.
Inverter - Stops the inverter output upon detecting excess heat sink
temperature in case of cooling fan failure or overload.
Braking - Protects the braking resistor from overheat in accordance with
resistor the setting of the electronic thermal overload relay for braking
resistor.
* It is necessary to set the function code data according to the
braking resistor used (built-in or external).
Overload Stops the inverter output according to the inverter heat sink
protection temperature and
calculated from the output current.
(Note) No alarm output depending upon the data setting of the function code.
Description
phase loss, stopping
the switching element
During
acceleration
During
deceleration
During running
at constant
speed
During
acceleration
During
deceleration
During running
at constant
speed
(Stopped)
the inverter output.
temperature
8-5
"—": Not applicable.
LED Alarm
monitor output
displays [30A,B,C]
Yes
OC1
OC2
OC3
Yes
OU1
OU2
OU3
Yes
LU
(Note)
Lin Yes
Yes
OPL
Yes
OH1
Yes
dbH
Yes
OLU