Electrical Connections; Battery Installation; Manual Release; Limit Switch - tau MASTER20T Manual De Uso Y Mantenimiento

before fixing them permanently (the magnets remain firmly in place) in order to find the correct position for optimal operation.
The magnet with North polarity (black) is used as an opening limit switch (OLS), and the magnet with South polarity (red) is used as a closing limit switch (CLS).
Note: to activate correctly the magnetic sensor, distances as shown in picture 17/B must be respected
IMPORTANT: it is necessary to set up the slowdown of the stroke when magnetic limit switches are installed (See K580M's user
manual, stroke setup section).
3. TYPE OF SYSTEM (fig. 5)
1 Gearmotor
2 Photocell column
3 Flashing light with antenna
Cable sections:
MASTER18QR / MASTER-R
a 3 x 1,5 mm²
b 4 x 0,5 mm²
c 2 x 0,5 mm²
d
4 x 0,5 mm²
e
2 x 0,5 mm²
f 3 x 0,5 mm²
g 2 x 0,5 mm²
h RG58
i 2 x 0,5mm²
l
(Gearmotor)
m
Place the control unit (external versions) in the immediate vicinity of the
Be careful not to run cables for auxiliary devices inside raceways housing other cables supplying power to large loads or lights
with electronic starters.
In the event control pushbuttons or indicator lights are installed inside homes or offices several metres from the actual control
unit, it is advisable to decouple the signal by means of a relay in order to avoid induced
4. ADJUSTMENT OF THE ELECTRONIC/ELECTRIC CLUTCH
WARNING: Check that the impact force value measured at the points foreseen by the EN 12445 standard is lower than that indicated
in the EN 12453 standard.
The adjustment of MASTER18QR and MASTER-R can be performed through the control unit, see instructions K126MA.
The adjustment of MASTER20QR and MASTER20QM can be performed through the control unit, see instructions K580M.
The adjustment of MASTER20T can be performed through the control unit, see instructions D703M.

5. ELECTRICAL CONNECTIONS

Make sure that the gearmotor is disconnected from the power supply before performing any operations.
To make the connections, remove the gearmotor casing, pass the cables through the holes on the base plate (when used) and through the lower sec-
tion of the gearmotor. Then arrange the cables for the connection to the control unit terminal block that is located in the electrical components support.
The distance between the control unit and the motor must not exceed 10 – 12 m.
Use cables with a minimum section of 2.5 mm ² for the power circuit of the MASTER18QR-R and 1.5 mm² for the MASTER20QR-M and MASTER20T, and
0.5 mm ² for the control circuit.
Consult the related instructions booklet for the control unit connections:
- K126MA MASTER18QR and MASTER-R;
- K580M MASTER20QR and MASTER20QM.
- D703M MASTER20T;
Note: the thermal protection (for MASTER20T only) must be wired in series to the common of the limit switch (terminal 19 of the D703M
board - see the manual of the D703M scheme).
6. 12V BATTERY INSTALLATION
If one wishes to fit a battery to the MASTER18QR-R gearmotor in order to guarantee power in the event of blackout, remove the casing and fit
the battery into its location; then connect the power supply cables to the tongues.
Note: when using in battery (in the event of a power failure) the performance of the MASTER-R (24v DC) is reduced.

7. MANUAL RELEASE

In the absence of the mains power supply, remove the lock cover, insert the special key and turn it as indicated in fig. 21.
Then pull the lever outwards in order to manually manage the gate, as shown in fig. 22.
DC versions feature a safety micro-switch in the release lever ("A", pic. 22). In case the gate operator stays released for more
than 5 seconds, the operator will perform a cycle at a slow speed to reset the operating parameters to the values originally
saved (see "Restoring automatic operation").

8. LIMIT SWITCH

Operators MASTER20QR(M) and MASTER20T are conceived to operate with electromechanical limit switch
The cables are connected as indicated in fig. 25:
1= grey (common);
If the movement continues when the gears rotate in a clock-wise direction and the spring moves as shown in fig. 26, invert the red and orange
4 key operated selector switch
5 Safety photocell
6 Sensitive edge
MASTER20QR(M) MASTER20T
3 x 1,5 mm² 4 x 1,5 mm²
4 x 0,5 mm² 4 x 0,5 mm²
2 x 0,5 mm² 2 x 0,5 mm²
4 x 0,5 mm² 4 x 0,5 mm²
2 x 0,5 mm² 2 x 0,5 mm²
3 x 0,5 mm² 3 x 0,5 mm²
2 x 0,5 mm² 2 x 0,5 mm²
RG58 RG58
2 x 0,5mm² 2 x 0,5mm²
(Gearmotor) 4 x 1,5mm²
(Limit switch) 3 x 0,5mm²
2= orange (L.S. close - contact N.C.);
18
7 Floor stop
8 Post for control panel
9 Control panel complete with casing
motors.
interference.
devices..
3= red (L.S. open - contact N.C.);