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Aria-34e
Digital Key Telephone System
4.5.1 KSU GROUNDING
The Aria-34e Series of Digital Key Telephone Systems do not provide separate earth terminal
for PE (Protective Earth) and TRC (Telecom Reference Conductor). The Protective Earth
connection is via the 240VAC GPO and power cord. It is absolutely essential that the Protective
Earth terminal of the 240VAC GPO is bonded to the building protective earth system, as verified
by an electrician.
A separate TRC MUST NOT be installed.
The TRC is provided via a linking to the PE within the KSU equipment. The TRC/PE linking is
automatically engaged as each board is plugged into the KSU.
WARNING
ALL COMMUNICATION NETWORK CONNECTIONS MUST BE DISCONNECTED
FROM THE SYSTEM BEFORE THE AC POWER LEAD CAN BE REMOVED FROM
THE SYSTEM OR THE G.P.O
THE MAINS POWER LEAD MUST BE PLUGGED INTO THE G.P.O BEFORE
MAKING ANY CONNECTIONS TO THE NETWORK.
4.5.2 POWER LINE SURGE PROTECTION
It is recommended that the Aria-34e system should be equipped with a power-line transient
surge protection device at the 240VAC GPO. Systems equipped with such devices are more
resistant to damage from power line surges than unprotected systems. Power line surges often
occur during switching operations and especially during violent thunderstorm activity.
Installation of a surge protector meeting the specifications described here will prevent or
minimise the damage from power-line surges. The protector should be fast acting and capable of
protecting against transients greater than 400 volts.
4.5.3 INSTALLING POWER SUPPLY UNIT
The Power Supply Unit mounted within the system supplies power for the boards, key stations,
telephones and battery charging. The power unit will be installed during production.
The PSU circuitry is located on the right hand side in the base of the KSU. The recommended
operating conditions are:
Input Voltage
220V ~ 240V
Ensure the PSU is connected as in Figure 3.
Aria Communications Pty Ltd.
A.C.N. 090 723 925
Fuse
T1 A H 250V
4-6
Installation
Rev 1.3
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