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The following are solutions to several common problems.
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The strike will not activate after installation
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Check the fuse or circuit breaker supplying power to the system. Check that all wiring connections are securely made. When wire nuts are used, ensure that both wires are firmly twisted together for good electrical transfer between the wires. Check the solenoid coil rated voltage (as shown on the coil label) to make sure that it corresponds to the output side of the transformer within 10 percent. Using the VOM, check the voltage at the secondary (output) side of the transformer. Using the VOM, check the voltage at the solenoid. This assures you that there are no broken wires, bad rectifiers, or bad connections. Check the coil for a possible short.
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The transformer overheats
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Make sure that the rated voltage of the transformer and the rated voltage of the coil correspond within 10 percent. Make sure the VA rating is adequate. For all Adams-Rite units, it is recommended you see 40 VA; 20 VA is the absolute minimum, and you could experience transformer heating in even moderate use applications.
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The rectifier overheats
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The rectifier is wired incorrectly. This means the overheating is of a temporary nature (a few milliseconds) and then it s burned out. There are too many solenoids being supplied by a single rectifier and you are pulling more current through it than the system diodes are rated for.
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The solenoid overheats
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The coils used in an electric strike latch, when used as rated (continuously or intermittently by pulsing once per second), gave a coil temperature rise rating of 149 F (65 C) above ambient. To get the exact temperature, add 149 F plus 72 F (ambient), which equals 221 F. The coil insulation is rated at 266 F (130 C). Regardless of whether the coil goes to 221 F or 266 F, it is too hot to keep your fingers on it! With the above in mind, it is fair to say the most intermittent duty units never see that kind of use. If a coil gets extremely hot on very short pulses at 2- or 3-second intervals, you either have the wrong coil or the wrong
Electrical Access and Exit Control Systems
Figure 19.11 Power data for electric strike units. (Adams Rite Mfg. Co.)
transformer output. The same is basically true for continuous duty coils. If the coil temperature exceeds the ratings, it has to be because the coil voltage or the transformer are improperly coordinated.
If you set up the meter as if testing for a short (see previous instructions) and obtain the exact resistance, you can compare to the specifications found in Fig. 19.11; this becomes another way of knowing you have the correct coil. Figure 19.11 also provides all the power data for the various electric strikes from Adams Rite that you might ever be required to install on various premises.
Determining the proper wire size
Some people especially those not trained in the various phases of proper electricity assume that a low voltage means you can use the smallest and cheapest wire size available. This is certainly not the case. The size of the wire is dependent on the use, the amount (voltage) of electricity going through the wire, the distance the wire runs, and the number of strikes to be used on the wire run.
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Figure 19.12 Tables for determining what size is required based on type of electric strike unit used. (Adams Rite Mfg. Co.)
To determine the correct wire size, obtain the wire size factor from Table 1 of Fig. 19.12 and multiply this number by the distance to the strike (in feet). Take the resulting number in circular mills (CM) to determine the wire size required from Table 2 of the figure. Example 1. A 24-volt ac intermittent (24 Vac-int) is to be mounted 60 feet from the transformer. The wire size factor for the unit is 34. Multiply 34 times 60; this equals 2040. On Table 2, 2040 corresponds to a wire size of 16 gauge. Example 2. What is the maximum distance that you could mount the same 24 Vac-int using a 20-gauge wire From Table 2, the largest CM number corresponding to 20 gauge is 2000. Divide 2000 by the wire size factor for 24 Vacint (34) to get 29. The maximum distance is 29 feet. If two or more strikes are to be actuated simultaneously on the same circuit, multiply the wire size factor by the number of strikes. Then, multiply by the distance to the farthest strike to obtain the CM number and the wire gauge required for the installation. Electric Door Openers The Trine Consumer Products Division of the Square D Company is another major supplier of electric door openers. Trine units are available for standard wood and metal doors and narrow stile doors, such as those obtainable from Adams-Rite (Fig. 19.13). Fourteen different models are currently available for such diverse applications as entrance doors to apartments, banks, institutions, industrial buildings and complexes, offices, and interlocking door control. Installed in the door jamb in place of the lock strike or in conjunction with various other locksets, these units offer the ability to lock or unlock a door from a remote control station. This variety of electric strike can be used with most standard brands of locksets in both mortise and surface mount types.
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