MID-7604/7602Power Drive 10 ni.com
Ifthe DC powersupplies are active, the green power LED illuminates.
If this LED fails to illuminate, check the powercord an d the main input
fuse on the front panel.
TheLED status array is arranged by motor axes. Each of the four columns
representsan axis, and each of the three rows represents a particular status.
Table1 summarizes the axis and status to which each LED in the 3 ×4
array corresponds.
Driver Fault Output LEDs
The top rowof LEDs indicates the statu sof t he stepper drivers.An LED
illuminatesred when an overcurrent condition or a problem with t he motor
busvoltage on that axis occurs.
Driver Inhibit LEDs
Themiddle 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 from the back panel,
if the ENABLE switch on the front panel is in the inhibit position, if the
motion controller’sinhibit signal is low, or if the per-axis inhibit input is
activelydriven.
Thep olarity of the per-axisin hibit input is selectable from the front panel
DIPswitches. See the Front Panel DIP Switch Settings section of this guide
for more information.
Limit Status LEDs
Thebottom row of LEDs indicates whether or not a limit switch is currently
active.The LED illuminates green if either the forward or reverse limit
switchis active for each axis. Youcan select the p olarity for the limit status
LEDsfrom the front panel DIP switches. See the Front P anel DIP Switch
Settings section in this guide for more information.
Table1. Front Panel LED Indicators
Status Motor Axis
DriverFault Output (red) 1 2 3 4
DriverInhibit (yellow) 1 2 3 4
Limit Status (green) 1 2 3 4