Virginia Controls, LLC
MH-3000 User Manual, 1_03C10-VC
Page 10
2.2.2
Car Top Selector
The pulsing-type Car Top Selector provides Floor Change/Slowdown signals and Leveling
signals, as shown on the car top selector sheet in the schematic. The signals should be a
normally open contact that closes as described below.
1.
UP SLOWDOWN closes at the Slowdown distance below the floor.
2.
DOWN SLOWDOWN closes at the Slowdown distance above the floor.
3.
UP and DOWN LEVEL, and DOOR ZONE/LOW LEVEL. (See "Leveling Sws")
NOTE: Recommended slowdown distance is about 6" for every 25fpm of car
speed, for speeds of up to 200fpm. Minimum recommended target length for
the floor switches is 1".
An extra reset target is required at each terminal landing, as shown on the
schematic, so that the Up Slowdown Switch is closed when the car is in the leveling
zone at the top landing, and the Down Slowdown Switch is closed when the car is in
the leveling zone at the bottom landing. These targets are used to reset the floor
position at the terminal landings.
2.2.3
Leveling Switches
The Up Level Switch is a normally open contact that closes when the car is in the leveling
zone below the floor, and the Down Level Switch is a normally open contact that closes when
the car is in the leveling zone above the floor. Adjust the distance between the Up Level
Switch and the Down Level Switch to be equal to the length of the leveling vane/target plus
the desired Dead Zone distance (usually 1/4" to 1/2"). The actual length of the leveling
target is not critical (except in some short floor situations) and is usually 6-10". Position the
leveling vane/target so that when the car is floor level the Up and Down Leveling Switches are
centered around the vane/target, and both switches are open.
The Door Zone Switch is a switch (or switches) activated by the leveling vane/target when
the car is within 3" of floor level. If the leveling vane/target is 6" long, then only one switch is
required, mounted between the Up and Down Leveling Switches, otherwise two switches
wired in series should be provided.
2.2.4
Terminal Landing Normal Slowdown Switches
The Terminal Landing Normal Slowdown Limit Switch is a normally closed contact that
opens when the car is closer to a terminal landing than the minimum slowdown distance. It
will prevent the car from running into the terminal landing at full speed. It should be adjusted
to open approximately one inch beyond the point where the normal slowdown (from the floor
switches or the car top selector) is initiated.
2.2.5
Terminal Landing Normal Limit Switches
The Terminal Landing Normal Limit Switch (sometimes called a Directional Limit
Switch) is a normally closed contact that opens when the car has traveled 1" past
floor level at a terminal landing. The car should not be on the Terminal Landing
Normal Limit Switch when the car is floor level at the terminal landing. The Limit
