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Inverter Protection
This section explains the functions for protecting the Inverter and the braking resistor.
Performing Overheating Protection on Mounted Braking Resistors
Perform overheating protection on Inverter-mounted braking resistors (Model: ERF-150WJ ).
When overheating in a mounted braking resistor is detected, an alarm RH (Mounted braking resistor overheating) is displayed on the Digital Operator, and the motor coasts to a stop.
Related Constants
Constant
Number
Name Description
L8-01
Protect selection for internal DB resistor (Type
ERF)
0: Disabled (no overheating protection)
1: Enabled (overheating protection)
Setting
Range
Factory
Setting
Change during
Operation
V/f
Control Methods
V/f with
PG
Open
Loop
Vector
Flux
Vector
MEMO
BUS
Register
0 or 1
Multi-function Contact Outputs (H2-01 to H2-03)
0 No A A A A 4ADH
Setting
Value
D
Function
Braking resistor fault (ON: Resistor overheat or braking transistor fault)
V/f
Control Methods
V/f with
PG
Open
Loop
Vector
Flux
Vector
Yes Yes Yes Yes
INFO
The most likely causes of RH (Mounted braking resistor overheating) being detected are that the deceleration time is too short or that the motor regeneration energy is too large. In these cases, lengthen the deceleration time or replace the Braking Resistor Unit with one with a higher breaking capacity.
Inverter Protection
Reducing Inverter Overheating Pre-Alarm Warning Levels
The Inverter detects the temperature of the cooling fins using the thermistor, and protects the Inverter from overheating. You can receive Inverter overheating pre-alarms in units of 10 ° C.
The following overheating pre-alarm warnings are available: Stopping the Inverter as error protection, and continuing operation, with the alarm OH (Radiation fins overheating) on the Digital Operator flashing.
Related Constants
Constant
Number
Name Description
Setting
Range
Factory
Setting
Change during
Operation
V/f
Control Methods
V/f with
PG
Open
Loop
Vector
Flux
Vector
MEMO
BUS
Register
L8-02
Overheat prealarm level
Sets the detection temperature for the Inverter overheat detection pre-alarm in ° C.
The pre-alarm detects when the cooling fin temperature reaches the set value.
50 to
130
95 ° C* No A
L8-03
Operation selection after overheat prealarm
Sets the operation for when the
Inverter overheat pre-alarm goes
ON.
0: Decelerate to stop in deceleration time C1-02.
1: Coast to stop
2: Fast stop in fast-stop time
C1-09.
3: Continue operation (Monitor display only.)
A fault will be given in setting 0 to 2 and a minor fault will be given in setting 3.
0 to 3 3 No A
* The factory setting depends on the Inverter capacity. The value for a 200 V Class Inverter of 0.4 kW is given.
A
A
A
A
A 4AEH
A 4AFH
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