Siemens IGWIPS200-1 User Manual download pdf (Page 12)

IGWiPS200-1

ANTENNA CONNECTORS AND SURGE VOLTAGE PROTECTION

Each transceiver has an MCX female antenna connector. The base 3-1/2", 1/4-wave whip antenna has an MCX male

connector. Optional higher gain antennas and low-loss coaxial cables have type-N connectors. MCX to type-N

adapters and other connector adapters are available. Optional antennas may be accompanied by additional

installation instructions.

If an antenna will be installed out-of-doors or otherwise exposed to surge voltages or strong electromagnetic fields,

such as from a nearby lightning strike, a COAXTRAB Surge Voltage Protection Adapter should be included in the

installation; see Figure 1 for a typical installation. The adapter features a user replaceable gas arrestor tube that

shunts induced high voltage to ground to help protect the transceiver.

Type-N connectors are provided on the adapter; the genders of the two adapter connectors are specified by the

adapter part number. Mount the surge adapter through a bulkhead, through the wall of an enclosure (as shown in

Figure 1), in-line with the antenna cable, on the supplied straight bracket, or on a user-fabricated bracket. Installation

instructions are supplied with the adapter.

CURRENT (AMPERAGE) BUDGET CALCULATION

A common current bus interconnects a transceiver and its connected I/O modules; see Figure 2. The current on this

bus may not exceed 5A. This section shows how to calculate the current flowing on the common current bus. Note

that the calculations in this section are also useful when determining power supply requirements at each transceiver

location.

Figure 2 shows a two-node (remote site and control room) wireless network. The remote site has a remote

transceiver, two input modules, and a power supply. The master transceiver is installed at a control room with two

complementary output modules and a power supply.

The bus current at each transceiver location is calculated by summing the current requirements for the transceiver

and all connected I/O modules. Table 2 lists the current requirements of each module type.

Remote Site

Control Room

Common

Current Bus

Common

Current Bus

Remote Transceiver

Analog Input Module,

Address 1

Digital Input Module,

Address 2

Power Supply

Master Transceiver

Analog Output Module,

Address 1

Digital Output Module,

Address 2

Power Supply

MG00430a

Figure 2 Current (Amperage) Budget Example

Remote Site

As shown in Figure 2, the remote site has one remote transceiver, one analog input module, and one digital input

module. Table 2 shows that the transceiver draws 75 mA, the digital input module 26 mA, and the analog input

module 32 mA plus 20 mA per active channel. The total current (I

) requirement is:

= 75 mA + 26 mA + 32 mA + (4 x 20 mA) = 213 mA

May 2007

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Siemens IGWIPS200-1 User Manual Page 12

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