Quad, Opt/Ttl; F-25/Mag, Ch-A - MERRICK Genetix Safety, Installation, Operation And Maintenance Manual

Whenever this input is on, the belt speed will be set to a constant speed which
is determined by a user parameter called "Inferred Speed" (see Main Menu >
Advanced Setup > Tachos > Numeric Data > Inferred Speed).
Tacho 1
Each tacho that is enabled (see Main Menu > Advanced Setup > Configuration >
Tacho n) must be configured as to its type and direction detect ability. When you
select this tacho from the menu, you will two settings as follows:
Type...
Direction..
Type
The type of tacho connected to this port must be set here. This is basically the
electrical characteristic of the specific tacho used. The options are:

Quad, Opt/TTL

F-25/Mag, Ch-A

Quad, Opt/Line Drv
Frequency
Quad, Opt/TTL
This setting is used with 2-channel encoders that have their outputs
arranged in a quadrature arrangement (one channel leads the other by 90°).
These types of encoders can be used to detect direction of belt travel as well
as distance, and travel in the reverse direction will not be counted. In this
scenario only forward travel will be measured, which can be useful if there is
significant vibration or encoder noise that might otherwise be interpreted as
belt travel.
The outputs of this encoder must be nominal "TTL" levels (i.e. 0-5 VDC).
This is the most common type of encoder used on Merrick belt feeders.
F-25/Mag, Ch-A
The setting is used with the Merrick F-25 or DSP-825 type 2-wire current
loop encoders, and certain other encoders of this style.
These encoders are single channel and therefore do not have the ability to
detect direction. Also, they may be connected to either tacho port on the
GCM, but they must be connected to channel A.
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