INSTALLATION (continued)
Power Wiring
The Master ATS Annunciator can be powered by either an ac or dc source (but not both) as shown on the Outline and Installation drawing 387797 and in Figure
3.For ac wiring use a Class 2 bell transformer with a
120V 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 power source (750 ma) to terminals 7
!
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 and 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
2for 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 pairs 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.
shield gnd |
| Acceptable | |
Communication Cable | |||
T+ |
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| Standard 80˚ C |
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R+ |
| Belden 1419A |
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| Belden 9842 |
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resistor on |
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| Belden 9829 |
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Master 1 only |
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| Alpha 6202C |
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| Alpha 6222C |
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| Plenum Rated |
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| Belden 89729 |
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| Belden 82729 |
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| Alpha 58902 |
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Figure 3. Terminal block (Master). Located on right side of circuit board.
Figure 4. Typical separate terminal block.
Networks for Interconnecting ATS Annunciators 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 desired reliability 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. It 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.
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