Virginia Controls, LLC
MH-3000 User Manual, 1_03C10-VC
Page 9
2.1.2
Controller Grounding
Grounding of the controller must conform to all applicable codes. Proper
grounding is essential to the safe operation of the equipment. It will also reduce
the likelihood of noise-induced problems, which could include CPU crashes, or I/O
communication errors.
•
The grounding wire should be sized per the applicable codes.
•
Connect the ground to a good building ground, such as the structural steel of
the building, or a cold water pipe.
2.2
Car and Hoistway Wiring
Review the schematics and field wiring diagrams before attempting to hook up the
controller.
2.2.1
Floor Switches
The Floor Switches, if used, are normally open contacts that should close under each of
the following conditions:
1.
the car is at the slowdown point above the floor, OR
2.
the car is at the slowdown point below the floor, OR
3.
the car is at the floor (optional), OR
4.
the car is between the up and down slowdown points of that landing (optional).
Conditions (1) and (2) are required to change the floor relays and initiate slowdown.
Condition (3) is required at the terminal landings, but is optional at the intermediate landings.
Condition (4) is optional.
There are many acceptable methods of providing the floor switch signals, such as by
having a single Floor Switch at floor level, and an adjustable length cam on the car, or by
having two Floor Switches per floor, and a fixed length cam on the car. The Floor Switches
may be mounted on the car if they are in separate rows. It is recommended that the method
used allow for separate adjustment of the up and down slowdown distances.
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".
If there are short floors, refer to the schematic for special instructions, if required.
NOTE: The terminal landing Floor Switches must be maintained while the car
is within door zone of the terminal landing.
