Rockwell Automation 1336E IMPACT Adjustable Frequency AC Drive User Manual V 1-4.XX - Manual (Page 370)

B-32 Control Block Diagrams
Inverter Overload Overview You can use the following block diagram to view how the drive uses
the parameters for inverter overload.
The inverter overload is designed to provide limits to ensure that the
device ratings for the power semi-conductors are not exceeded. The
inverter overload tests for excessive temperatures within the device
and excessive current over time (IT).
120˚C
–100
S
400%
87 2 10
A
B
A
B
NTC Foldback Protection
'IT Inverter Protection Torque Limit Sts
Limiter
Integrator
IT
Inverter
Select
(Limiting)
(Not Pending)
To Motor
Current
Limit
Selection
To Motor
IT
LIMIT
IT
LIMIT
Current
Limit
Selection
4 [I
s
] x M
I
100% x I
M
150% x I
M
˚C RISE
30˚C
Nameplate
Amps
Convert Motor to
Inverter Units
Convert Inverter
to Motor Units
Convert Inverter
to Motor Units
MULT
Transistor RJC
100% Rated Inverter Iq in Motor Per Unit
11
Inverter
Amps
M
I
I
I
M
M
87 1 9
Torque Limit Sts
60 Sec @ 150% Inverter Current
22
23 13 Fault Select 2
Warning Select 2
Error
Protection
Inverter Heatsink
Temperature,˚C
150% Rated Inverter Iq in Motor Per Unit
13
Is
125 MS
Filter
168
Flux Current
V
– +
168
Flux Current
V
– +
Flux Current