DG-IRMCK203 Datasheet, PDF (16/67 Pages) International Rectifier – Application Developer’s Guide

IRMCK203 Application Developer’s Guide
Dc bus feedback
ADS7818
Actual DC bus voltage
IRMCK203
input
(assumption: amplifier gain 1/100 )
internal digital
voltage
counts (Fixed)
Overvoltage trip fault
3360
4.1 V
410V
Undervoltage trip fault
976
1.2 V
120V
Undervoltage clear level
1152
1.4 V
140V
Table 9. Overvoltage and Undervoltage Trip Levels
Some applications may require power regeneration. Under such circumstances, an external braking circuit (for
dynamic braking) can be used to absorb regeneration energy from the motor. The IRMCK203 provides braking
control. The braking control utilizes dc bus voltage feedback to determine when to activate and release the
braking circuit. The dynamic braking voltage level is given in Table 10. The analog scaling (amplifier gain) of
the dc bus presets the brake on-off levels.
Brake
Condition
Brake turn on
Brake turn off
Dc feedback digital counts
ADS7818
Actual DC bus voltage
(Fixed)
Input voltage
(assumes amplifier gain 1/100)
3120
3.8 V
380V
2944
3.6 V
360V
Table 10. Dynamic Braking Voltage Levels
2.7 LED Modes
The operating state of the IRMCK203 is indicated by the LED module. There are three indication modes. Mode 1
indicates successful configuration of the IRMCK203. The LED is green in this mode. Thus, a green LED appears
automatically right after power up.
A red LED indicates a drive fault condition. This is Mode 2.
The LED is not lit in Mode 3. This is a hardware fault condition. This means that either configuration data was
not transferred to IRMCK203 correctly or the IRMCK203 itself has a hardware problem.
Mode
Mode 1
Mode 2
Mode 3
LED Indication
Green
Red
Off
Description
IRMCK203 configuration has been done correctly and IRMCK203 is functioning
normally.
A drive fault condition is pending.
IRMCK203 is not functioning indicating either configuration is not completed correctly
and/or IRMCK203 has a hardware problem itself.
Table 11. LED Modes
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