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INSTALLATION (continued)
Power Wiring
The Master ATS Annunciator can be powe red by
either an ac or dc source (but not both) as shown onthe
Outline and Installation drawing 387797 and in Figure
3. For ac wiring use a Class 2 bell transformer with a
120 V ac primary and a 16 V ac secondary (12 VA
minimum). Connect the ac wiring to terminals 9 and
10; connect the ground to terminal 1. For dc wiring
connect a 12 or 24 V dc powe r source (750 ma) to
t e r m i n a l s 7 ( --- ) a n d 8 ( + ) .
To prevent damage do not
energize the circuit at this time.
!
Communication Wiring
Connect one end of the transmit and receive commu-
nication cable (twisted pairs) to terminals 3 through 6
on the Master ATS Annunciator as shown on the
Outline and Installation drawing 387797 and in Figure
3. Refer to the Daisy Chain a nd Star configuration
hook up drawings for typical arrangements. Use
communication cable specified in Figure 3. This cable
has two twisted pairs (4 wires) and an overall shield.
All twisted pair shields must be connected to terminal
2 for grounding. The earth ground is connected to
terminal 1 and internally jumpered to terminal 2. Two
resistors are supplied. Connect one resistor (390 Ohm,
1/4 Watt, 5%) between terminals 5 and 6 on Master 1
only. See Figure 3. (The other resistor will be con-
nected at the automatic transfer switch furthest away.)
Two twisted pa irs can be connected to the ATS
Annunciator terminal block. Use a separate terminal
block (not supplied) mounted in a separate wall box if
more connections are necessary, as shown in Figure 4.
Acceptable
Communication Cable
Plenum Rated
Belden 9842
Belden 9829
Alpha 6202C
Alpha 6222C
Belden 89729
Belden 82729
Alpha 58902
Belden 1419A
shield gnd
T+
T---
R+
R ---
resistor on
Master 1 only
Standard 80˚ C
Figure 3. Terminal block (Master).
Located on right side of circuit board.
Figure 4. Typical separate terminal block.
Networks for Interconnecti ng ATS Annunci ators and ATSs
Refer to Drawing JS 401900 Sheets 1 through 4 for
typical interconnection schemes. The Daisy Chain
configuration utilizes a single run of communication
cable with all of the equipment connected in parallel as
shown on Sheet No. 1. This type of network utilizes the
least amount of cable and is probably the most popular
approach when long line runs are anticipated. Depend-
ing on the desi re d reliabi li ty of the system, some
consideration should be given to the effect of a cable
break. If the cable is broken all ATSs beyond the break
will lose their communication. I t should be kept in
mind that annunciator lamps will flash if a disconnec-
tion occurs. Also, a disconnection of the communica-
tions cable will in no way impair the operation of the
automatic transfer switch.
Star networks can be used as an alternate configu-
ration as shown on Sheet No. 2. With this approach,
greater reliability can be achieved because a discon-
nect of the cable between the junction box and the ATS
will only impair one switch.
Depending on location of this equipment it may
sometimes be advantageous to use combinations of
Daisy Chain and Star networks. Typical configurations
are shown on Sheets No. 3 and 4.