ASEM HMI30, User Manual

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32
SECTION 3 – Installation and connection
Attention: the system must
be powered with a voltage of 24V
(18V÷36V).
Figure 34
Power supply connection detail
3.8 Connecting the device
3.8.1 Notes on connection

HMI30 must be installed in accordance with the indications contained in this
operating instructions.
3.8.2 Grounding and bonding

Whenever two pieces of equipment connected to each other are far apart, it
is possible that their ground connections could be at a different potential
level. The data cable screens connecting the equipment’s chassis on one end
and the HMI’s chassis on the other end can therefore be subject to a high
current circulation capable of destroying the interface. To overcome this
hazard such current must be steered away from the interface. To achieve this
goal the following methods can be used:
1.
Use an equipotential bonding cable (16mm
2
) to connect the equipments’
ground to the HMI’s ground.
2. Connect the data cable screens to the equipotential bonding rail on both
sides before connecting the cable to the interfaces.
3.8.3 Power supply connection
The device may only be connected to a 24V (maximum permissible oper-
ating voltage range 18V to 36V) power supply which satisfies the requirements of
safe extra low voltage (SELV) in accordance with IEC/EN/DIN EN/UL60950-1.
The power supply has to fulfil the requirements NEC Class2 or LPS in accordance
with IEC/EN/DIN EN/UL60950-1
Connect the device with a cable cross-section of 0.75 – 1.5 mm
2
(AWG18 to
AWG16).

Remove the three poles connector from the system.

Connect the positive pole, the negative and the ground one (also refer to the
label on the back of the system) to the respective terminals of the three pole
connector.
+ (24V)
EMC Ground (0V)
- (0V)