Emerson Mini Maestro DCD60x10/20, Руководство пользователя

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Mini Maestro User Guide
27
Issue Number: 5 www.controltechniques.com
5 Diagnostics
Two LEDs and one digital output are available on the drive to give the following:
Monitoring the status of the drive
Diagnostics
I
2
t protection
5.1 LED indicators
I
2
t protection indicator
The I
2
t LED is lit when I
2
t exceeds the programmed value set by the RIN resistor.
When the I
2
t LED is lit, the drive is limited to the value of nominal current set by the RIN
resistor.
I
2
t protection can be caused by:
A heavy working cycle with quick and frequent accelerations
Reversal of the drive
Drive rating inadequate.
When I
2
t limiting is not activated, the green LED will light and a Drive NORMAL output
signal will be produced.
DRIVE HEALTHY indicator
The DRIVE HEALTHY LED indicates that the drive is operating normally. When the LED
is unlit it indicates at least one of the drive protection functions is active.
5.2 Fault finding
Use the following procedures when the system is not working correctly after calibration.
Green LED off
Power supply voltage out of range
Check the DC supply voltage is within the acceptable range.
Drive protection is activated
Check for a short circuit between the power connector terminals.
Check the motor inductance is not too low.
Motor not in full control
Tachogenerator cables reversed
Reverse the tachogenerator cables.
Motor cables reversed
Reverse the motor cables.
No tachogenerator signal on pin 11
Check the tachogenerator and the tachogenerator cables.
RT resistor not installed
Calculate the correct value for the RT resistor see Setting up the drive to adjust
the components.
Speed reference signal
Reduce the speed reference signal to less than 1mV.
Motor turns in reverse direction
Speed reference signal connections reversed
Correct the speed reference signal connections.
Motor connections connections reversed
Correct the motor connections.
Tachogenerator connection pins reversed
Correct the tachogenerator connections.