Omron VARISPEED G7 -, Instruction Manual

Page: 259 / 417

6
-64
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 overheat-
ing) is displayed on the Digital Operator, and the motor coasts to a stop.
Related Constants
Multi-function Contact Outputs (H2-01 to H2-05)
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
L8-01
Protect selec-
tion for internal
DB resistor
(Type ERF)
0: Disabled (no overheating
protection)
1: Enabled (overheating
protection)
0 or 1 0 No A A A A A
DB Resistor
Prot
Set-
ting
Value
Function
Control Methods
V/f
V/f
with
PG
Open
Loop
Vec-
tor
1
Flux
Vec-
tor
Open
Loop
Vec-
tor
2
D Braking resistor fault (ON: Resistor overheat or braking transistor fault) Yes 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.