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DIP switch S3 switches 1, 2, 3, and 4, are used for this purpose.
Input Switch Number Factory Setting
RESET 1 ON
+ LIMIT 2 ON
– LIMIT 3 ON
VEL/TORQUE 4 OFF
By setting switch 2 to the OFF position, the operation of the + LIMIT would change to be
closed to run in a plus direction. This reversing characteristic is true for all four switches.
There is a FAULT output. This is equivalent to an open collector NPN transistor with its
emitter connected to GND. This transistor can sink 2 amps and it can withstand 110 volts
dc when OFF. When a fault occurs, this output turns ON. This output can also have its
polarity inverted by switching the fourth switch on DIP switch S2. Once this is done, this
output will be ON if no fault exists. This output would now be thought of as a READY
output instead of a FAULT output. The normal fault operation occurs with S2-4 ON.
The purpose of inversion of this output is to allow for direct connection to fail safe brakes
or other brake interlock circuits. This transistor can sink two amps, and it can withstand
110 volts DC when OFF.
If this inverted output is used, consideration for the Power-Up Reset Input may be
required. For example, during power-up a reset would disable faults. This same reset
may then defeat the desired operation of the brake. With no faults and an inverted output
selected, the brake output would be ON but power would not be applied to the motor. If
the JR1 shorting pin is installed then a Reset/Disable condition is allowed to keep the
output ON even though there is no fault.
Sometimes the amplifiers Reset Input is used as an Enable Input by switching OFF S3-1.
The first input has to be switched ON (grounded) to enable the amplifier. With the input
OFF (ungrounded) the amplifier is in the reset condition. In the reset condition, the Reset
LED (red) is ON, fault conditions are reset, and the bridge power devices are disabled. If
an external controller uses a fault output to disable the amplifier by switching off the reset,
the fault that cause the fault conditions is reset. To preserve the fault status, the JP2
jumper can be moved to the left position. In this position, the fault LED's will clear when
the enable is switched ON.
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