OM0240
|
Rev 6 December
/2019
Page 6 of 34
NuAire, Inc.
|
2100 Fernbrook Lane
|
Plymouth, MN 55447
|
U.S.A
|
ph: 763.553.1270
|
fx: 763.553.0459
|
tf: 800.328.3352
Electronic Tachometer Board
This board is powered by: The transformer
The electronic tachometer board controls:
•
The microcontroller board
•
The display card
•
The centrifuge motor
•
The refrigeration group
•
The lock motor
It also transmits the power accumulated during rotor braking to the load shedding resistance.
Transformer
The transformer generates 3 voltages identified by the following colors:
Voltage
26V
16V
9.5V
18.5V
Color
Green
Yellow
Red
Black
1.2 Lock
The lock consists of a media on which the following are assembled:
1)
Micro contact / Micro switch
No. 1
:
It detects the open position of the lock.
The deadbolt presses on the micro switch blade when
the lid strike plate is completely released.
2)
Micro contact / Micro switch
No. 2
:
It detects the closed position of the lid.
The guide finger comes in contact with the micro
switch blade when the lid is closed.
This signal stops the gear motor command.
A “Lid lock tempo” timer allows for adjusting the stop
for proper locking.
3)
Magnetic sensor:
It detects the approach of the lid. The integrated
magnet in the lid strike plate allows for starting the
gear motor command.
4)
Deadbolt:
It pivots to mechanically immobilize the lid.
5)
Crankshaft:
It actuates the deadbolt through the motor reducer.
The locking position is obtained when the crankshaft
and the deadbolt form a 90 degree angle.
This position is marked by the trace on the visible face.
6)
Trace from the locked position
7)
Motor reducer:
It rotates counter-clockwise to close and clockwise to
open. It is supplied with a voltage of 24 V.
1.3 Motor
It is a three phase induction motor powered in variable frequency.
It has an integrated over temperature sensor. It measures the heating of the internal motor winding, and sends a signal
from 130 degrees Celsius. It then sends the message “ERROR 04”.
1.4 Speed Sensor
The speed sensor is a Hall Effect magnetic sensor, placed under the motor. Six (6) magnets with alternating poles are placed
on a rotating disc. The sensor measures the frequency of passage of the magnets, to determine the speed.
1
2
3
4
5
6
Visible face - when
the front panel is
removed
Internal Face - after
extraction of the
lock unit
7
