User's Manual

Planning the Installation

Part No. 430-4G-200-00-000

2-12

2.7. C

HOOSE POWER SOURCE

V-Station 4G and V-Flex 4G devices can be powered by several methods:

• 12V DC regulated adapter/bullet jack

• Power Over Internet (POE) through an inline PoE 802.3af power injector

• 3-pin mini connector with dedicated power source.

Power sources should be:

• Isolated from other equipment

• Filtered

• Protected by an Uninterruptible Power Supply (UPS) or battery backup

• Protected by a voltage suppression device if transient electrical surges are an issue in the

location.

When planning a system, know the power requirement of each device. If multiple devices are to

share a common power supply, exercise care to avoid excessive voltage loss on the wires. Volt-

age loss can lead to communication problems when devices are talking and/or listening on dif-

ferent ground references.

Voltage loss is directly proportional to wire resistance and the current the wire carries. Always

place the device as close as possible to the power supply and always select a wire size

appropriate for the load. V-Station 4G devices run on DC power between 12.5 and 24 VDC.

Power requirements for all V-Station 4G and V-Flex 4G models are listed below in Table 2-3.

Power Requirement: 12 watts

Input Voltage Range: 12-24.0 VDC

Peak Current (12 VDC) 1 A

Peak Current (24 VDC) 500 mA

Table 2-3: V-Station 4G and V-Flex 4G Power Requirements

Most power supplies on the market today provide good input and output isolation. However,

power supplies which do not provide isolation (or have high leakage capacitance), coupled with

accidental AC power line interchanges, present serious ground fault problems for installers. With

a ground fault, the signal reference between subsystems may be 115 VAC apart. If these sub-

systems are interconnected, the large potential difference can cause equipment damage or per-

sonal injury. L-1 EAS recommends using a dedicated regulated DC power supply.

All factory-supplied power supply assemblies are either switching or regulated linear supplies

and are isolated for safety and to minimize ground loop problems.