The accuracy of setting is 1/10 of a turn of
actuator output shaft. For four train counter
gear, 4 limit switches of 1 NO + 1 NC or 2 NO
Limit Switching
Two Train Counter Gear
Four Train Counter Gear
Functions
For Two train counter gear, two limit switches,
one for each direction of travel having 1 NO
+ 1 NC or 2 NO + 2 NC contacts are provided.
The number of spindle turns can be set
between 1 and 480 or 1 and 4800.
Two Train Counter Gear
Four Train Counter Gear
Examples of such application are :
+ 2 NC contacts are provided.
The limit switching enables to switch off the
actuator when reaching defined valve
position, usually end positions. The valve
travel is measured by mechanical counter gear
mechanism which when reaching the set
switching points operate the electrical limit
switches by cams. The setting accuracy is 1/10 of
In limit switching, two train counter gear and
a turn of actuator output shaft.
four train counter gear versions are available :
If limit switching is required at two end
positions only, two train counter gear is used.
However, if two additional intermediate
switching positions are desired, Four Train
Counter Gear is required. This limit switching
has 4 counter gears and 4 micro switches. Two
counter gears are used to switch off at end
positions as in Two Train Counter Gear. The
other two are available for setting any desired
intermediate positions between end positions.
After cam actuation, the switches remain
actuated till reaching end of valve travel.
To stop at intermediate position
Sequence control, that is to start
another equipment like pump or bypass
valve actuator after certain travel
of valve.
9
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