board functions and layout
6
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INSTALLATION MANUAL
6.5.2.
RZA / RZB reed switch contacts
The two reed switch contacts (RZA / RZB) are contained in the same housing and, in combination with a single
magnetic strip per floor, actuate the safety circuit which defines and enables:
•
Hydraulic: the releveling zone
•
Rope: the door pre-open and/or releveling zone
The safety circuit employs three contactors (K1, K2, K3), or a STEM NC81 device.
6.5.3.
DMS / DMD reed switch contacts
The DMS and DMD reed switches are used for the "short floor" function, i.e. when the space between two floors
is less than the slowdown di 400 mm.
The DMS reed switch (up) and DMD reed switch (down) enable:
•
If there is insufficient physical space to slowdown between the two floors, they initiate slowdown before the
floor immediately preceding the destination floor
•
They move the car in low speed between the two closely spaced floors
Depending on the order data, the wiring diagrams normally include an enclosure indicating how to lay out the
additional magnetic strips for the "short floors".
6.5.4.
Slowdown / phase plug control at the top and lowest floors (CRS / CRD)
Both electromechanical contacts
CRS
/
CRD
(or
CRSB
/
CRDB
bistable without/with supporting relay), located at
the end floors, act directly on the direction contactor coils to stop the car and prevent it travelling beyond its
travel limits at high speed if it arrives "out of step". They therefore have a safety function and reliable contacts
should therefore be used, preferably "obligatory disconnect" limit switches.
They must be located at a distance such that, once they are tripped, the car will stop under friction in worst case
loading (empty when travelling up and fully loaded when travelling down) before it reaches the end floor.
In addition to its slowdown control function, the CRD acts as a phase plug at the lowest floor (see par. 3.3
"Reset").
6.6.
Board technical specifications
6.6.1.
MP3 base board
MP3SW
This is the motherboard, located in the control cabinet, responsible for serial
communications, via inputs J3/2-3, with the car and floor serial boards.
6.6.2.
MPCAB serial board
MPCAB
Located on the car roof, it handles the serial connection between the cabinet and
car relating to:
•
no stop / load sw
•
photocells / safety edge sw
•
door operators (optional) and their limit switches
•
gong / overload signal
IMPORTANT
The maximum number of available stops is 32.
ELETTROQUADRI
SINCE 1983
MP3
