Crown FM150, Руководство пользователя

Страница: 18 / 110

2.1 Operating Environment
You can install the FM transmitter in a standard component rack or on a suitable surface
such as a bench or desk. In any case, the area should be as clean and well ventilated as
possible. Always allow for at least 2 cm of clearance under the unit for ventilation. If you set
the transmitter on a flat surface, install spacers on the bottom cover plate. If you install the
transmitter in a rack, provide adequate clearance above and below. Do not locate the trans-
mitter directly above a hot piece of equipment.
2.2 Power Connections
The FM30, FM150, and FM300 operate on 100, 120, 220, or 240 volts AC (50 or 60 Hz; sin-
gle phase). Each transmitter can operate on DC power as well (28 volts for the FM30, 48
volts for the FM150, and 72 volts for the FM300). The transmitter can operate on fewer volts
DC, but with reduced RF output power (see section 1.3). In addition, the transmitter isolates
the AC and DC sources; both can be connected at the same time to provide battery backup
in the event of an AC power failure.
2.2.1 AC Line Voltage Setting
To change the voltage setting, follow these steps:
1. Disconnect the power cord if it is attached.
2. Open the cover of the power connector assembly using a small, flat blade screw
driver. See Illustration 2–1.
3. Insert the screwdriver into the voltage selection slot and remove the drum from the as-
sembly.
4. Rotate the drum to select the desired voltage. See Illustration 2–2.
5. Replace the drum and cover and check to see that the correct voltage appears in the
connector window.
6. Connect the AC power cord.
2-2 FM30/FM150/FM300 User’s Manual