Virginia Controls, LLC
MH-3000 User Manual, 1_03C10-VC
Page 20
4.9
Field Adjustable Features
Refer to the section on changing Settings and Features to see the features that are
adjustable.
The controller is usually set up for the specific job when it is shipped from Virginia
Controls. It is recommended that the "Reset Settings" sequence be performed, or the
settings and features be checked, when the controller is first powered up. This sequence is
described in the section Reset Settings, or in the Frequently Asked Questions - How Do I
Reset All Settings and Features Back to the Original Values.
The settings or features that most often need adjustment are the door times, and fire
service return floors.
4.10
Zoned Duplex Operation
The Duplex System will keep one car at the Main Dispatch Landing, as the Lobby Car,
and allow the other car, or the Free Car, to stop at it's last call. The Lobby Car will answer
calls in the Low Zone, and the Free Car will answer all other calls. The Lobby Car may leave
the lobby to assist the Free Car under various load conditions as described below under
Start Control. The "Low Zone" is an adjustable group of landings but the factory preset
value is normally the Lobby/Main landing and any landings below the Lobby/Main landing.
All other landings are in the "Upper Zone". If a car is "Next" in a zone, then it will answer
calls in that zone, otherwise it will answer calls in the other zone. If both cars are in
service, a car will always be homed to the Main Lobby level.
4.10.1
Common Circuits
Several circuits need to be energized when either car is on. These include the Hall Calls,
Fire Service, and some other circuits that may be required for a particular job (such as
Emergency Power, Hospital Service, etc.). These circuits get their power from either car by
means of the VR (Voltage) relay. (See the schematic.)
Install each car separately. The Hall Calls and Hall Fire signals may be wired to either
car, then cross-connected to the other car.
WARNING: Be careful not to mix the power supplies from one car
with the other car. Signals that are common to both controllers must
be connected to a common supply, as shown on the schematic.
WARNING: The controller is fed from multiple power supplies.
Dangerous voltage levels may still be present if only one car is turn
off.
4.10.2
Next Car
A "Next Car" is selected for the Low Zone and the Upper Zone. This car will be assigned
hall calls in the respective zone. The other car may answer calls in a zone where it is not
"Next", but it will not normally be sent to calls outside its zone.
