300 SERIES USER GUIDE
15
Enable Inputs
The polarity of the amplifier's output can be controlled with the Positive and Negative
enable inputs, and the outputs can be completely disabled with the Enable input.
Output polarity control is usually used on motion control systems that use travel -limit
switches. If a moving member hits one of these switches, it is supposed to disable the
amplifier, preventing further travel into a mechanical stop. At the same time, it should be
possible to reverse the direction of the motor to 'back-out' of the limit. Positive and
Negative enable inputs are provided for this function.
For a shutdown of the amplifier (both outputs off), use the Enable input. This signal will
also cause the Normal LED to turn off, and the Normal output to go LO.
The enable inputs use +5V logic signals, external dry-contact, or NPN current-sinking
drivers. Ground is the level required to make the function logically true, and +5V (or
open-circuit) will make the function false (true = enabled, false = disabled).
The Enable signal only may have its' true logic-level inverted by removing the jumper in
header J17 at position-9 (see functional diagram). When this is done, leaving the Enable
input open
, or at +5V will enable the amplifier, and grounding it will shut it down.
Note: The Positive and Negative Enable inputs must always be grounded to enable the
respective outputs.
Current Monitor
This is a signal that is a measure of the output current of the amplifier.
The scale factor in amps/volt is listed below. All of the 300 series output a +/-6V signal
when the current is at the peak rated value.
Amplifier Amps/Volt
303,303B 2.0 Table 6
306, 306B 4.17
306A,306AB 5.0
312 1.5
Status LED
A green Normal LED is on the basic amplifier, the MB4 card, and Eurocard.
It will be ON when operation is Normal:
Buss voltage is within normal limits.
Enable input is true. (See above for details on Enables)
Chassis temperature is <83°C.
No short circuits between outputs, or between outputs and ground.
It will be OFF during a fault condition:
Buss voltage is over or under normal limits.
Enable input is false.
Chassis temperature is >83°C.
A short-circuit has occurred at the outputs.
The short-circuit, and overtemp faults are latching type, that is, they will disable the
amplifier until power is cycled off and on, or until the Reset input is toggled.
Note: The Positive and Negative enable inputs will not affect the status of the Normal
LED or Normal output.
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