13
Contact Closure Inputs:
Maintained Mode Operation
In maintained mode, the Switched Live output for a
channel, for instance SW Live 1A, is energized only while
the contact closure is provided to the input for that
channel. As soon as the contact closure is removed from
the input, the Switched Live output is de-energized. This
gives rise to possible conflicts if a contact closure is
provided during the time another contact closure is
provided. Below are descriptions of how the Group
Controller addresses these situations.
Inputs on a single channel
When a contact closure is provided to a single input on an
individual channel, the Group Controller will energize the
appropriate Switched Live output. If a contact closure is
then provided to another input on that same channel while
the first contact closure is provided, the Group Controller
will recognize this combination as a request to stop. This
will happen regardless of how much time elapses between
the application of the two contact closure inputs.
For example, if a contact closure is provided to Close 1,
the Group Controller will energize the Switched Live
output to close the AC motor on Channel 1. If a contact
closure is provided to Open 1 while a contact closure is
still provided to Close 1, the Group Controller will de-
energize the Switched Live output on Channel 1, stopping
the AC motor.
If contact closures are provided to both the Open and
Close inputs on a particular channel, the Group Controller
will de-energize the Switched Live outputs for that
channel. If one of the contact closures is then released,
the Group Controller will NOT recognize that as a request
to move the AC motor to the position indicated by the
contact closure that is still provided. Instead, the Group
Controller will leave the Switched Live outputs de-
energized. In order for the Group Controller to recognize a
new input signal, the contact closure must be removed
and then provided again.
Note: It is not recommended to connect two or more
contact closure devices on the same channel if
Momentary mode is selected. If this is done, it is possible
for a channel to become unresponsive to inputs if contact
closures are provided by the two devices at the same
time.
For instance, if one device provides a contact closure to
the Open input, the Group Controller energizes the
Switched Live output that opens the AC motor. If the
second device then provides a contact closure to the
Close input, the Group Controller will then de-energize the
Switched Live output, stopping the AC motor. At this point,
both contact closures must be removed before the Group
Controller will recognize a new request.
If it is desired to connect two or more contact closure
devices on the same channel, use Maintained mode.
Inputs on a single channel and Master Control
When a contact closure is provided to a single input on an
individual channel, the Group Controller will energize the
appropriate Switched Live output. If a contact closure is
then provided to a Master Control input while the first
contact closure is still provided, the Group Controller will
energize the Switched Live outputs requested by the
Master function on all channels of the Group Controller.
For example, if a contact closure is provided to Close 1,
the Group Controller will energize the Switched Live
output to close the AC motor on Channel 1. If a contact
closure is then provided to the Master Open input while a
contact closure is still provided to the Close 1 input, the
Group Controller will energize the Switched Live outputs
to open the AC motor on all channels.
When a contact closure is provided to a Master Control
input, the Group Controller will energize the appropriate
Switched Live outputs on all channels of the Group
Controller. If a contact closure is then provided to a single
input on an individual channel while the Master Control
contact closure is still provided, the Group Controller will
activate the Switched Live output requested by the
individual input, while keeping the Switched Live output in
the same state for the other three channels.
For example if a contact closure is provided to the Master
Open input, the Group Controller will energize the
Switched Live outputs to open the AC motor on all
channels. If a contact closure is then provided to the
Close 1 input, the Group Controller will energize the
Switched Live output on Channel 1 to close the AC motor
on Channel 1, but continue energizing the Switched Live
outputs on Channels 2, 3 and 4
Appendix A
Summary of Contents for WC-2M-GC
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