2-50 Digital Inputs
The purpose of this input function is to allow a 2-wire start while the
direction is being controlled by some other means.
The terminal block bit must be set in the [Start Mask] and [Logic Mask]
parameters in order for the terminal block to start the drive using this
input.
If the “Run” input function is configured, it will not be possible to start
or jog the drive from any other control device. This is true irrespective of
the state of the [Start Mask], [Direction Mask], and [Logic Mask]
parameters.
The Effects of 2-Wire Start Modes on Other DPI Devices
The “Run/Stop” and “Run Fwd/Rev” start modes are also called
“2-wire” start modes, because they allow the drive to be started and
stopped with only a single input and two wires. When a “2-wire”
terminal block start mode is put into effect by the user, the drive can no
longer be started or jogged from any other control device (i.e. HIM,
network card, etc.). This restriction persists as long as one or more of
“Run”, “Run Forward”, and “Run Reverse” are configured. This is true
even if the configuration is otherwise illegal and causes a configuration
alarm.
• Start
An open to closed transition while the drive is stopped will cause the
drive to run in the current direction, unless the “Stop – Clear Faults”
input function is open.
The terminal block bit must be set in the [Start Mask] and [Logic Mask]
parameters in order for the terminal block to start or change the direction
of the drive using these inputs.
If “Start” is configured, then “Stop - Clear Faults” must also be
configured.
• Forward/Reverse
This function is one of the ways to provide direction control when the
Start / Stop / Run functions of the drive are configured as 3 – wire
control.
An open input sets direction to forward. A closed input sets direction to
reverse. If state of input changes and drive is running or jogging, drive
will change direction.
The terminal block bit must be set in the [Direction Mask] and [Logic
Mask] parameters in order for the terminal block to select the direction
of the drive using this input function.
Important:Direction control is an “Exclusive Ownership” function (see
Owners). This means that only one control device (terminal
block, DPI device, HIM, etc.) at a time is allowed to control
direction at a time. The terminal block must become
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