6-1
Protective Operation
6
6.
Protective Operation
6-1
List of Protective Operations
When an error occurs to the inverter, a
protective function is activated to trip the
inverter immediately, displaying the name of the
alarm at the LED and allowing the motor to
coast to stop.
Name of alarm
Display
Description of operation
Overcurrent
OC1
During
The protective function is activated when an overcurrent flowing in
protection
acceleration
the motor or a short circuit or ground fault in the output circuit
OC2
During
causes the instantaneous inverter output current to exceed the
deceleration
overcurrent detection level.
OC3
During constant
speed operation
Overvoltage
OU1
During
The protective function is activated when the regenerative power from
protection
acceleration
the motor increases to cause the DC link voltage of the main circuit
OU2
During
to exceed the overvoltage detection level (Approx. 400 Vdc for 200V
deceleration
class, Approx. 800V for 400V class). When an excessive voltage is
OU3
During constant
added to the source voltage, the inverter trips due to the overvoltage,
speed operation
but inverter protection against the overvoltage is impossible.
Undervoltage
LU
The protective function is activated when the source voltage drops to cause the DC
protection
link voltage in the main circuit to become lower than the undervoltage detection
level (Approx. 200 Vdc for 200V class, Approx. 400V for 400V class). If F14 Restart after
momentary power failure has been selected, no alarm display is given. If the voltage
drops below the control power maintenance level, no alarm is displayed.
Input phase
Lin
When the inverter is operated while one of the three phases of the power supply
loss
connected to the main power supply input terminals L1/R, L2/S and L3/T of the main
protection
circuit is missing or there is an unbalance among the three-phase voltages, the rectifying
diode or smoothing capacitor of the main circuit may be broken. The inverter is stops
upon an alarm in these cases.
Heat sink
OH1
The protective function is activated when the temperature of the heat sink of the inverter
overheat
overheat is high because of a broken cooling fan or for other reasons.
External
OH2
The protective function is activated by a contact signal from an alarm contact of the
alarm
external device such as the braking unit, braking resistor, and external thermal overload
input
relay connected to the control circuit terminal (THR). Or an overheat protective function is
activated by the PTC thermistor.
Braking
dbH
If the electronic thermal overload relay (for braking resistor) has been selected for
resistor
function code F13, the protective function is activated upon a high operation frequency of
overheat
the braking resistor to prevent the resistor from being burned due to the temperature rise.
Motor 1
OL1 If electronic thermal overload relay 1 has been selected for function code F10, the
overload
protective function is activated by a motor current exceeding the set operation level.
Motor 2
OL2
If motor 2 has been selected and driven and electronic thermal overload relay 2 has been
overload
selected for function code A06, the protective function is activated by the current in motor
2 exceeding the set operation level.
Inverter
OLU
The protective function is activated by an output current exceeding the overload current
overload
rating to protect the semiconductor elements in the main circuit of the inverter from high
temperatures.
Memory error
Er1
The protective function is activated by a data writing error or other errors in the memory.
Keypad panel
Er2
The protective function is activated when a data transmission error or transmission
communication
stoppage is detected between the keypad panel and the control section in the keypad
error
panel operation mode.
CPU error
Er3
The protective function is activated by electric noise or other errors developed in the
CPU, or if P24 is overloaded.
Option error
Er4
Error during operation of option
Er5
Output phase
Er7
The protective function is activated during auto tuning when there is a broken wire or no
loss
connection in the inverter output circuit.
RS485
Er8
The protective function is activated when a communication error occurs during
communication
communication through RS485.
error
Table 6-1-1 List of alarm display and protective operations
Содержание VXSM150-1
Страница 3: ......
Страница 41: ...5 12 Selecting Functions 5 Frequency setting block diagram ...
Страница 45: ...5 16 Selecting Functions 5 Note The chain line indicates the motor speed ...
Страница 71: ...7 1 Troubleshooting 7 7 Troubleshooting 7 1 When Protective Function Activates 1 Overcurrent ...
Страница 72: ...Troubleshooting 7 2 7 2 Overvoltage 3 Undervoltage ...
Страница 77: ...7 7 Troubleshooting 7 3 The motor loses speed during acceleration 4 Excessive heat generation from motor ...