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Inverter Protection
This section explains the functions for protecting the Inverter and the braking resistor.
K K K K
Performing Overheating Protection on Mounted Braking Resistors
Perform overheating protection on Inverter-mounted braking resistors (3G3IV-PERFo).
When overheating in a mounted braking resistor is detected, an alarm RH (Mounted braking resistor overheat-
ing) is displayed on the Digital Operator, and the motor coasts to a stop.
nRelated Parameters
Param-
eter
Num-
ber
Protect selection for inter-
nal DB resistor
L8-01
DB Resistor Prot
Multi-function Digital Outputs (H2-01 to H2-03)
Set Value
D
INFO
-60
6
Name
LCD Display
0: Disabled (no overheating protection)
1: Enabled (overheating protection)
Braking resistor fault (ON: Resistor overheats or brake transistor fault)
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.
Setting
Description
Range
0 or 1
Details
Control Methods
Change
Factory
during
V/f
Setting
Opera-
V/f
with
tion
PG
0
No
A
A
Control Methods
V/f
V/f
with
PG
Yes
Yes
Open
Loop
Vec-
tor
A
Open
Loop
Vec-
tor
Yes
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Troubleshooting
