ADVANCED OPERATION - Section 5
5-20 MTS-3000 SERIES OPERATION AND REFERENCE MANUAL
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5.7 DIGITAL I/O
This menu appears whenever the SET button on the Digital I/O module is pressed. It offers a variety of ways
to configure the inputs and outputs of the module.
5.7.1 Input Channel 1
(I/P Chan 1)
For most test applications, this channel will be configured as the relay operation detection or trip input since
it’s provided with an LED indicator and can [optionally] be provided with a DC current output to operate
DC current targets. The left two terminals sense change of state of relay contacts, while the right two sense
change of state of voltage signals. Additional information on operation of the inputs as triggers is contained
in section 4.4 Trigger/Timer Operation.
5.7.1.1 TRIP (ie STOP).
This is the default setting of Input 1. As described in 5.7.1 above, it’s intended to sense external operation
of a unit under test, and trip the MTS from fault to postfault state. Appearance of a trip signal in this mode
also will freeze the output readings and the timer.
5.7.1.2 EXTERNAL START
(FLT (ie Start))
This selection programs the input to act as an external start trigger, permitting an external contact/voltage
signal to initiate the same action as pressing the FAULT button. This starts the timer running and switches
the AC outputs from prefault to fault state.
5.7.1.3
Pulse Timing.
The Pulse Timing selection programs the input to measure the duration of a one-shot pulse, such as the
sealed-in trip output signal from a protective relay system. The first transition of the signal starts the timer,
while the next transition stops it.
5.7.1.4
Reset.
This selection programs the input to respond to an external signal as a reset trigger, initiating the same action
as pressing the RESET button. This resets the timer, unfreezes the output readings, and returns the system
to prefault state.
5.7.1.5
Reclose.
The Reclose selection programs the input to respond to an external signal as a reclosure initiation trigger. It
works along with the programmable reclosure features described above in 5.2.9.
5.7.1.6
Foot Switch.
This selection programs the input to accept an external foot switch as a fault initiate trigger in Static mode,
(i.e. the outputs will be maintained as long as the input signal is sustained). See Section 4.3 for further
information about operation modes.