Inverter Protection; Overheating Protection For An Inverter-Mounted Braking Resistor - Omron VARISPEED F7 User Manual

Inverter Protection

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.
Related Parameters
Parameter
No.
L8-01 Protection selection for internal DB resistor (Type ERF)
Multi-function Digital Outputs (H2-01 to H2-03)
Set Value
D Braking resistor fault (ON: Resistor overheats or brake transistor fault)
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
INFO
deceleration time or replace the Braking Resistor with one with a higher braking capacity.
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.
IMPORTANT
Name
Function
Control Methods
Change
Factory during
V/f with
Setting Opera-
V/f
PG
tion
0 No A A
Control Methods
V/f
V/f with
PG
Yes Yes
).
Open Closed
Loop Loop
Vector Vector
A A
Open Closed
Loop Loop
Vector Vector
Yes Yes
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