FAQs

Questions

  1. How much load should there be on the regulator?
  2. What is the effect on the regulator if it is over loaded?
  3. Will shorts in the field circuit cause the regulator to shut down for protective shutdown?
  4. What are some type faults for a regulator?
  5. What test equipment is needed to test the regulators?
  6. Why does the Green Lens Filter on my Manairco Beacon keep shattering?
  7. Does Manairco sell direct or do I have to go through a distributor?
  8. Do you sell replacement and repair parts?
  9. Do your products qualify as "Buy American"?
  10. Do you sell beacon poles/towers?

Answers

Q. How much load should there be on the regulator?
A. The regulator will operate satisfactorily for any load up to the full rated KW of the regulator. According to the FAA Advisory Circular, specification, on the regulator, it must regulate the current within + , ­ 0.1 amp on any step from zero (short circuit, SC) to full load (100% rated) and with up to 30% lights out from 50% load to 100% load. It is recommended to load the regulator as close as possible to the rated load size for greater efficiency. The regulator is rated in kilowatts (KW for resistive load) but must be sized according to the KVA of and power factor of the load. The size needed will be the total sum KVA of the lighting plus isolation transformer losses and cable losses (determined by the length from the vault to the circuit and return to vault) all divided by the load power factor. The lighting fixture manufacturer literature or nameplate should be consulted for the KVA losses of the particular fixture.
Q. What is the effect on the regulator if it is over loaded?
A. Depending upon the amount or percentage load over 100%, the regulator will develop an over voltage, over the rated voltage of the particular KW size ( a rule of thumb; the output voltage is rated @ 1515 volts per 10 KW load) and the output current will decrease on the high step (the over load may or may not be detected on lower steps). The amount of current decrease on the high step will be determined by the type regulator, the input voltage various from nominal, the amount of overload, the ambient temperature, and how long the regulator operates on the high step. Consequently, the greater the overload, the lower the input voltage, greater the ambient temperature, and longer the operating time on the high step will produce a lower output current on the high step. Also it will be noted that the longer the regulator operates on the high step the greater the current drops. The simple short circuit (SC) test or pulling the S1 disconnect (with power off) on the output of the regulator will normally reveal this; the current is normal with the SC (or S1 handle out) but drops out of limits on the high step with the load connected (or S1 handle installed).
Q. Will shorts in the field circuit cause the regulator to shut down for protective shutdown?
A. The regulator does not detect any shorts for protective shutdown. Regulators are considered series current devices and need a circuit to produce current. The regulator load circuits are not grounded and must have 2 or more shorts in the circuit for current to flow to ground. The shorts in the field only produce lighter loads for the regulator. The regulator only shuts down in protective shutdown for opens in the field or for an over current from the regulator. The regulator ammeter will reveal which condition it is, hence there is no current flow in an open circuit and for shorts the current will be normal.
Q. What are some type faults for a regulator?
A. The most damaging fault to a regulator is an open in the series lighting circuit. The regulator is designed to shut down in less than 2 seconds for an open in the series circuit. If for some malfunction, the regulator does not shutdown it will produce higher than normal voltages on some of the regulator components and on the lighting circuit. Another fault would be more than 30% of lights burned out (or lights not installed in the fixtures). This condition would also cause the output voltage to rise on the regulator and the series field lighting circuit.
Q. What test equipment is needed to test the regulators?
A. A true RMS ammeter calibrated and with a high accuracy clamp on for the particular steps is recommended for measuring the output currents. A true RMS digital multi­meter is recommended for trouble shooting. An output watt meter or voltmeter may be specified at time of order or as a field kit to help in analyzing the regulator load and in troubleshooting of the regulator or of the field circuit.
Q. Why does the Green Lens Filter on my Manairco Beacon keep shattering?
A. Unlike the Clear and Yellow filters, the Green Lens Filter is NOT tempered to withstand extreme heat. The green lens filter MUST be installed using the provided aluminum "standoffs" that are pre-installed on the beacon head. Loosen the standoffs and position them straight (horizontally)out from the beacon head. Insert the green lens between the standoff prongs and re-tighten. Click here to see photo.
Q. Does Manairco sell direct or do I have to go through a distributor?
A. We sell our products through Electrical Contractors, Electrical Supply Companies and also sells directly to the end user.
Q. Do you sell replacement and repair parts?
A. Yes! We have a large inventory of replacement lamps, lenses and repair parts and if we don't have it, we can get it.
Q. Do your products qualify as "Buy American"?
A. Nearly all of our product line qualifies as Buy American.
Q. Do you sell beacon poles/towers?
A. Yes, we sell a full line of "Tip Down" beacon poles from 25' up to 55'.