Inverter Protection - YASKAWA Varispeed G7 Series 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
Name
Con-
stant
Display
Number
Protect selec-
tion for internal
DB resistor
L8-01
(Type ERF)
DB Resistor
Prot
Multi-function Contact Outputs (H2-01 to H2-05)
Set-
ting
Value
D Braking resistor fault (ON: Resistor overheat or braking 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.
INFO
Description
0: Disabled (no overheating
protection)
1: Enabled (overheating
protection)
Function
Control Methods
Change
Setting Factory during
V/f
Range Setting Opera-
V/f with
tion
PG
0 or 1 0 No A A
V/f
Yes

Inverter Protection

MEMO
Open Open
BUS
Flux
Loop Loop
Regis-
Vec-
Vector Vector
ter
tor
1 2
A A A 4ADH
Control Methods
Open Open
V/f Loop Flux Loop
with Vec- Vec- Vec-
PG tor tor tor
1 2
Yes Yes Yes Yes
75
6-