View source for Installing and Configuring of Z3-Plus with TTA-3

The Z3-Plus is a 2-Wire audio overlay track circuit operating on 9 to 24VDC and is field configurable for the following track drive frequencies: 8.2K, 10K, 11.5K, 13.2K, 15K, 17.5K, 20K, 26KHz.

The TTA-3 is a surge protection for the Z3-Plus and is Comet’s recommendation.

'''Materials:'''
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|- style="height: 23px;"
| style="width: 14.1985%; height: 23px; text-align: center;" | Quantity
| style="width: 38.6578%; height: 23px; text-align: center;" | Comet Part #
| style="width: 47.1436%; height: 23px; text-align: center;" | Description
|- style="height: 23px;"
| style="width: 14.1985%; height: 23px; text-align: center;" | 1
| style="width: 38.6578%; height: 23px; text-align: center;" | 400586
| style="width: 47.1436%; height: 23px; text-align: center;" | Z3-Plus
|- style="height: 23px;"
| style="width: 14.1985%; height: 23px; text-align: center;" | 1
| style="width: 38.6578%; height: 23px; text-align: center;" | 401105
| style="width: 47.1436%; height: 23px; text-align: center;" | TTA-3 Three Terminal Arrestor
|- style="height: 23px;"
| style="width: 14.1985%; height: 23px; text-align: center;" | 1
| style="width: 38.6578%; height: 23px; text-align: center;" | 401107
| style="width: 47.1436%; height: 23px; text-align: center;" | AAR 2-3/8" Terminal Block w/ Hardware
|}

= Scope =
Provides basic installing of Z3-Plus with TTA-3 and frequency configuration (if necessary) of&nbsp;<br>Z3-Plus with AEI site specific parameters
= TTA-3 and Z3-Plus Installation =
<div>

== TTA-3 Installation ==
<div>1. Take Comet part number 401107, which will house the TTA-3 and mount to the wall/backboard. Comet mounts near the copper buss bar, as the grounding wire is relatively short.</div>
<div>2. Take the small bag of hardware and assemble on the terminal block in this order:</div>
<div style="margin-left: 25px;" >a. AAR Washer</div>
<div style="margin-left: 25px;" >b. Wire terminal (wired to Z3 track connections)</div>
<div style="margin-left: 25px;" >c. Wire terminal (wired to the track)</div>
<div style="margin-left: 25px;" >d. AAR Washer</div>
<div style="margin-left: 25px;" >e. Clamp nut</div>
<div style="margin-left: 25px;" >f. TTA-3</div>
<div style="margin-left: 25px;" >g. AAR Washer</div>
<div style="margin-left: 25px;" >h. Binding Nut (x2)</div>
<div>3. Ensure wire terminals are wired to the correct connections (see Drawing number 70-0274-06)</div>

== Z3-Plus Installation ==
<div><div><div>1. Determine compatible frequency needed for the site. It’s Comet standard to configure and provide Z3-Plus in 26KHz. If frequency is needed to be changed, navigate to Section 4.0 Z3-Plus Frequency Configuration before moving on.</div>
<div>2. After the correct frequencies are assigned, follow wiring schematic as according to Drawing number 70-0274-06 at the end of this document: “TRACK” connections to the TTA-3, “Presence OUT” connections to the APU, “BATTERY” connections to the LVD-2000 (low voltage detector).</div>
<div>3. Obtain track & Time authority. Always place the track shunt at the desired pick point BEFORE pressing the CAL button. Ideally the shunt should be a 0.06 ohm unit. After calibration move the shunt out approximately 10ft to ensure correct activation point.</div>
<div>4. After track side calibration procedures have been successfully completed, place a temporary shunt at the track wires on the unit in the case and verify that the signal system goes to stop. Once verified remove the temporary shunt.</div>
<div>5. If the unit will not calibrate, watch the relay drive LED for approx. 45 seconds. If it blinks this means the Z3-Plus has turned its receiver gain to the maximum setting and cannot see the track shunt. Look for open circuits between the Z3-Plus and the shunt on the track. I.e., track wires, bond wires, etc.</div>
<div>6. The Z3-Plus will look equally in both directions. If one side of the circuit has insulated joints the Z3-Plus will operate, however, the activation distance will not be the same. In general, track circuit equipment cannot see past insulated joints.</div>
<div>7. Audio overlay systems like the Z3-Plus will not work with wide band shunts in their track circuit range.</div>
<div>8. If relay drive is stuck ON look for short circuits between the Z3-Plus and the desired pick point.</div>
<div>9. The greater the distance between the Z3-Plus and track connections, the greater the affects ballast will have on the Z3-Plus performance.</div>
<div>10. Presence output is a dry contact configuration Form –C dry contact, 225mA max current. (N.C. contact with no train presence)</div>
<div>11. In good track ballast conditions, a Z3-Plus circuit can travel up to 500ft in each direction. Rotating operating frequencies to avoid interference with other equipment is recommended.</div>
<div>12. The higher the operating frequency the shorter the track circuit.</div>
<div>13. Optional: Paint a stripe on the side of the rail at the desired pick point at each end of the circuit to provide a visual troubleshooting aid.</div>
<div>14. High series inductance is the track leads, commonly found in primary surge protection assemblies can shorten the usable detection range of the Z3-Plus.<div>

= Z3 Plus Frequency Configuration =
<div>The Z3-Plus is capable of outputting the following track drive frequencies: 8.2K, 10K, 11.5K, 13.2K, 15K, 17.5K, 20K, 26KHz. In Figure 1, details the switch and TAP setting required to configure the unit for each frequency. This chart is also found on the backside once the top of the Z3-Plus is removed. Figure 2 provide examples of the setting for 8.2KHz.</div><div>Note: Perform the calibration procedure after changing the track frequency.</div></div></div>
[[image:img1740802915420.png|600px|center|frameless]]Figure 1: Frequency Selection Schematics</div>
<div>[[image:img1740844923033.png|600px|center|frameless]]

Figure 2: 8.2KHz Configuration[[image:img1740870664512.png|800px|center|frameless]][[image:img1740861556959.png|800px|center|frameless]]</div></div></div>