User Manual Instruction Manual

13-72 GV6000 AC Drive User Manual
Again, if fold back of current limit is not enabled in the Drive OL Mode (150), the drive
will generate a fault when operation exceeds the rated levels. This fault can not be
disabled. If current limit fold back is enabled then a fault is generated when current
limit is reduced.
13.25.3 Thermal Manager Protection
The thermal manager protection assures that the thermal ratings of the power module
are not exceeded. The operation of the thermal manager can be thought of as a
function block with the inputs and outputs as shown below.
The following is a generalization of the calculations done by the thermal manager. The
IGBT junction temperature T
J
is calculated based on the measured drive temperature
T
Drive
, and a temperature rise that is a function of operating conditions. When the
calculated junction temperature reaches a maximum limit the drive will generate a
fault. This fault can not be disabled. This maximum junction temperature is stored in
EE on the power board along with other information to define the operation of the drive
thermal overload function. These values are not user adjustable. In addition to the
maximum junction temperature there are thresholds that select the point at which the
Figure 13.19 – Heavy Duty Boundary of Operation
Current Level (Per Normal)
Time (Seconds)
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
1.00 10.00 100.00 1000.00 10000.00
Figure 13.20 – Thermal Manager Inputs/Outputs
PWM Frequency
(2 - 12 kHz)
Outpu t Frequency
(0-400 Hz)
Temperature Analog Input
(Volts)
DT O Sele ct
(Off,PWM,ILmt,Both)
Current Limit
(0 - 200%)
EE Power Board Data
IGBT Temper ature
(x deg C)
Drive Temp erature
(x deg C)
DTO Fault
(On,Off)
Active PWM Frequency
(2 - 12 kHz)
Active Current Limit
(0 - 200%)
I_total
(Amps)
V_dc
(Volts)
ILmt Alar m
(On, Off)
KHz Alarm
(On, Off)
Drive
Thermal
Overload