©
National Instruments Corporation
11
MID-7604/7602 Power Drive User Guide
Table 1 summarizes the axis and corresponding status for each LED in the
3 × 4 array.
Driver Fault Output LEDs
The top row of LEDs indicates the status of the stepper drivers. An LED
illuminates red when an overcurrent condition or a problem with the motor
bus voltage on that axis occurs. The LEDs also illuminate red when the axis
is inhibited. Refer to the
section of this guide for more
information about inhibit conditions.
Note
In older versions of the MID-7604/7602, the red status LEDs do not illuminate when
the yellow status LEDs illuminate. This behavior only occurs in newer versions of the
MID-7604/7602.
Driver Inhibit LEDs
The middle row of LEDs indicates whether or not a motor axis is inhibited.
An axis is inhibited and the LED illuminates yellow in the following
instances:
•
if the host bus interlock circuitry is activated
•
if the
ENABLE
switch on the front panel is in the inhibit (off) position
•
if the motion controller’s inhibit signal is low
•
if the per-axis inhibit input is actively driven
The polarity of the per-axis inhibit input is selectable from the front panel
DIP switches. Refer to the
Front Panel DIP Switch Settings
section of this
guide for more information.
Limit Status LEDs
The bottom row of LEDs indicates whether or not a limit switch is currently
active. The LED illuminates green if either the forward or reverse limit
switch is active for each axis. You can select the polarity for the limit status
LEDs from the front panel DIP switches. Refer to the
section of this guide for more information.
Table 1.
Front Panel LED Indicators
Status
Motor Axis
Driver Fault Output (red)
1
2
3
4
Driver Inhibit (yellow)
1
2
3
4
Limit Status (green)
1
2
3
4
