User manual

7
CHAPTER 2
Installation
Standard Installation
The Central Electronics, Model 4010, is a rack mounted unit. The rear of the Model 4010 must be supported with the brackets
provided. Installation dimensions and outline drawings for all components of the Series 4000 IFB System are located in the
Service Manual. The Central Electronics, Model 4010, provides a rear panel terminal strip for connection to the Model 4020
User Stations. This is a low-impedance, line-level signal and may be sent over standard microphone cable or telco cable. The
User Station will work at distances of up to 760 meters (2500 feet) with #22 cable. With an option battery adapter, this range
can be extended to 1500 meters (5000 feet). Connections for SA Output, SA relays, and Program Inputs may be made at this
terminal.
The Control Stations use either individual or common local AC power supplies. This allows the interconnect cables (to the
Central Electronics) to remain signal carrying only, avoiding the chance that a shorted cable might bring the entire system
down. This local power supply provides power for the electronics and the switch lamps.
Input Electrical Power (Mains)
The standard Model 4010 IFB Central Electronics is designed to operate on 120Volts AC 10% at either 50 or 60Hz. The
90-100 Volt model is designed to operate at 96 VOLTS AC 10%, 50 or 60Hz. The 220-Volt model operates on 220Volts AC
10%, 50 or 60Hz. The series 4000 control stations require 12-14 Volts AC or 16-20 Volts DC. A wall mounted power module
with an output of 12-14 Volts AC at 1 Amp is provided for this. Any external supply or transformer capable of supplying this
may be used. The output connects to TM2, terminals 3 and 4 on the microphone preamplifier board of the control station. See
Figure 1.
Configurations
A standard interrupted feedback system can consist of one(1) Model 4010 Central Electronics, four (4) Model 4020 User
Stations, one(1) Model 4025 Splitter Assembly, and at least one (1) Model 4001 Control Station. As many as four (4) Control
Stations may be used. See Figure 2.
Wire and Cable Considerations
The Control Stations are connected to the Central Electronics with 50-conductor ribbon cables. Model 4015-XX. The XX is
the cable length in feet. These cables may be ordered in 5-foot increments from five (5) feet to 100 feet. The maximum
recommended cable length is 100 feet from any Control Station to the Central Electronics. The user stations are connected to
the Central Electronics through standard 2-conductor-plus-shield microphone cable (e.g., Beldon #9451). A Smith #5209
spade-lug attaches to the rear panel terminal strip. See Figure 5.