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Inverter Protection
îš‹ Overheating Protection for an Inverter-Mounted Braking Resistor
This function provides overheat protection for inverter-mounted braking resistors (Model: ERF-150WJ ).
When overheating of a mounted braking resistor is detected, an fault RH (mounted braking resistor overheat-
ing) is displayed on the Digital Operator, and the motor coasts to stop.
The fault can be output using one of the multi-function digital outputs as well. Therefore one of the parameters
H2-01 to H2-03 has to be set to D.
îš„Related Parameters
Multi-function Digital Outputs (H2-01 to H2-03)
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f with
PG
Open
Loop
Vector
Closed
Loop
Vector
L8-01Protection selection for internal DB resistor (Type ERF) 0 No AAAA
Set Value Function
Control Methods
V/f
V/f
with
PG
Open
Loop
Vector
Closed
Loop
Vector
D Braking resistor fault (ON: Resistor overheats or brake transistor fault) Yes Yes Yes Yes
INFO
The most likely causes of RH (Mounted braking resistor overheating) faults 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 with one with a higher braking capacity.
IMPORTANT
This function is not applicable for protecting external braking resistors. When external braking resis-
tors are used together with the internal braking chopper, L8-01 should be set to 0 to disable the inter-
nal braking resistor protection.
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