GAI-Tronics DEX-101 Руководство - Страница 8

Просмотреть онлайн или скачать pdf Руководство для Система внутренней связи GAI-Tronics DEX-101. GAI-Tronics DEX-101 14 страниц. Hazardous area driller’s intercom stations

Печатать страницу

DEX-10

DEX-20

ODEL

X AND

Power

A separate power feed is recommended for stations in Div. 1 areas so that the stations can be de-energized

for maintenance without disrupting the power supply to the other equipment in the Div. 1 area. Refer to

Figure 4 and Figure 5 for wiring details. Remove the termination enclosure cover and pull all wiring into

the termination enclosure. Terminal block TB2 is provided for connection of power to the station.

Terminate all conductor ends using #6-32 screws lugs.

AC Models

Terminate the 120-240 V ac 50/60 Hz feed on TB2. This terminal block can also be used to connect 120-

240 V ac 50/60 Hz to the next station. The maximum current of the ac feed shall not exceed 20 amperes.

Refer to Figure 5 for more details.

DC Models

Refer to Figure 4. Terminate the 24 V dc feed on TB2. This terminal block can also be used to connect

24 V dc to the next station. The maximum current of the dc feed shall not exceed 20 amperes. Power

must be supplied by an isolated 24 V dc power source. Additional power feeds may be required to

increase the system distance and/or the number of stations.

: Isolated dc power sources must be used for this installation. The 24 V dc source should be

OTE

located as close to the system center as possible.

Grounding the negative side of the power source at one point is recommended to ensure hum and noise-

free operation. Noise present on dc power lines can negatively affect station operation. Therefore, noise

should be limited to 10 mV or less.

When installing this equipment, the power cable length is an important consideration. Refer to Table 1

for the recommended wire sizing details and the maximum cable lengths. This table is a guideline that is

useful in most applications; however, the installer must take into consideration any parameters specific to

their application.

Table 1. Maximum Distance between

Driller's Intercom Stations (in feet)* (DC)

# of

Stations

906

302

151

f:\standard ioms - current release\42004 instr. manuals\42004-679l2d.doc

10/10

RILLER

NTERCOM

AWG Wire

570

358

225

190

119

-------

TATIONS

*This chart is based on the following

parameters:

1. V(max) = 27 V

2. V(min) = 21 V

3. Cable temperature rating = 90º C

4. The American Wire Gauge

resistance table

For V(max) of 24 V, multiply the

distance shown by a factor of 0.47.

Pub.: 42004-679L2D

Page 7 of 13