Inverter Protection; Performing Overheating Protection On Mounted Braking Resistors - Omron VARISPEED G7 Instruction Manual

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