marposs P3UP - Page 37

Installation and User Manual
37
2. 24 V a.c. (sinusoidal) drive, specifications:
• input active
V
I
(ON) = 18 to 30 V a.c
I
I
(ON) = 10 mA a.c. (V
I
= 24 V a.c), 7 to 12 mA
(V
I
= 18 to 30 V a.c)
• Input deactivated
V
I
(OFF) <= 3 V a.c.
[
See N.B. (*CURRENT AND VOLTAGE
VALUES)
at page 30
WARNING
The machine inputs must be supplied by a
SELV (Safety Extra Low Voltage) power
source, as defined in the Standard EN60950-
1.
CONNECTION INSTRUCTIONS
• T
he machine I/O are designed to be operated by a single phase power supply system: Connect all the relays using
the same power supply phase. The energy distribution system neutral line must be connected to earth: When
using an IT type energy distribution system, always connect via a suitable isolating transformer.
• When wiring the Heavy Duty 16 A female 16 pin machine I/O connectors (supplied), proceed as follows:
1. Use shielded cables isolated against voltages greater than 250 V a.c. for all signals, including inputs. The
cables must be protected by global type braided shielding (covering > 85%). Use wire with a cross section
between 0.75 mm
2
and 2.5 mm
2
Maximum length of cable, including switch and breaker connections: 30m;
2. Strip wires by 7 – 7.5 mm at either end;
3.
Terminate each wire using a suitably rated lug; the lugs must also guarantee the surface distances (see
below);
4. Apply a tightening torque of 0.5 Nm to the screws (see Heavy Duty
specification). All screws must be fully
tightened, including the unused terminals
: check that the surface distance between adjacent screws, and
adjacent lugs, is greater than 3.2. mm;
5.
Connect the shield (P3UP side) to the case of the Heavy Duty connector and to the chassis on the machine
side using suitable terminal blocks o
r metallic cable clamps. Make sure that the contact surface between the
shields and the machine chassis is ample, free from surface insulation (e.g. paint) and the connections are
kept as short as possible. It is important to guarantee the continuity of the shield even when there are switches
and circuit breakers installed along the line, making sure that the parts that require shielding in the vicinity of
the switches are kept to an absolute minimum. Make sure that the shield is connected securely to the Heavy
Duty connector case using the dedicated screw (ensure ample contact surface). Do not solder or weld the
shield to the cable clamps or directly to the connector cases;
6. the machine I/O connector must not be inserted/extracted in the presence of voltage/current.
[
N.B.
Set-up the Control trip thresholds so that multiple commands cannot be tripped simultaneously during
normal working cycles.
[
N.B.
+24 Vnst
There is a + 24 V d.c. (with respect to Ground), non-stabilised (+ 10%) short-circuit protected
voltage
present on pin 8 of connector H1 capable of supplying a max current of 20 mA. The terminal can be used
to drive external micro-switches and/or 24 V d.c. inputs.