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compatibility. Dress covers are available in clear aluminum, satin black aluminum, polished stainless and polished brass finishes.
Double dress covers are also available for installations on double doors. In this case, the cover fits over two locks so long as they are not separated by more than 2" (50mm). Double dress covers have all the advantages mentioned above and in addition produce the appearance of a single device which inside is really two. Consult the catalog for dress cover part numbers.
2.8 TAMPER PROOFING THE MAGNALOCK
In situations where vandalism is expected, the Magnalock should be protected from tampering. The magnet itself is inherently
Another possibility is that Securitron inventories special tamper proof screws for both magnet and strike mounting. These screws are identical allen head types except that it requires a special key to install and remove the screws. It is unlikely that a vandal would have access to this type of key. Securitron optionally supplies the tamper proof screw sets with keys both in the form of a manual allen wrench and in a bit key usable with a drill.
3. ELECTRICAL INSTALLATION
3.1 GENERAL ELECTRICAL CHARACTERISTICS
The Magnalock constitutes a low current electric load. Owing to internal circuitry, the Magnalock does not show the normal characteristics of an electromagnetic or other inductive load. Inductive kickback is suppressed, so arcing across switch contacts need not be a concern. This suppression also protects nearby access control or computer equipment from possible interference. The circuitry performs the additional functions of canceling residual magnetism ("stickiness" on release) and accelerating field collapse so that the Magnalock releases nearly instantly when power is removed. Electrically speaking, the load is nearly pure resistive in nature although there is a modest capacitive component which depends on the series. The following chart shows the current draw for each version and the degree of internal capacitance.
| 32 @ 12V | 32 @ 24V | 34 @ 12V | 34 @ 24V | 62 @ 12V | 62 @ 24V | 82 @ 12V | 82 @ 24V |
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CURRENT | 300 mA | 150 mA | 350 mA | 175 mA | 250 mA | 125 mA | 350 mA | 175 mA |
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CAPACITANCE | 0 | 0 | 0 | 0 | 30 Mfd | 15 Mfd | 30 Mfd | 15 Mfd |
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Capacitance can be an issue if very sensitive switch contacts are used to control the Magnalock (such as a low current reed switch). A capacitive load includes some inrush current which can stress these contacts. Note however that the problem is diminished when the Magnalock is mounted some distance from the control switch as the interconnecting wiring adds a series resistance to the circuit which sharply limits the inrush.
3.2 STANDARD LOCK
For operation, DC voltage must be provided to the lock. The red wire receives +12VDC or +24VDC, and the black wire, 0V (negative). If the lock is connected with reverse polarity, it will not function at all. The voltage source may be regulated, filtered or pulsating DC (transformer + bridge rectifier). Half wave pulsating DC generated by a transformer and single diode will not properly operate the Magnalock. An exact voltage level is not necessary. Less than standard voltage will proportionately reduce holding force but will cause no harm. Overvoltage up to 30% is acceptable.
The model 34, 62 and 82 series Magnalocks are dual voltage units. This means that you can apply either 12 or 24 volts to the same unit and it will operate equally well. Dual voltage Magnalocks are