Arc maintenance shall be provided by using one Philips Bodine ARC Keeper Model _____________ [AK175PLS (for 120 or 277 VAC line voltage); AK175PLS-208V (for 120 or 208 VAC line voltage); or AK175PLS-240V (for 120 or 240 VAC line voltage)] in conjuction with one _____________ (100 to 175 W) _____________________ [reactor style (R), high-reactance autotransformer (HX) or constant-wattage autotransformer (CWA)] pulse-start magnetic ballast (with ignitor) operating one compatible ____________________ (100 to 175 W) HID pulse-start metal halide lamp. The pulsestart ARC Keeper shall have a maximum run time of two (2) minutes. The pulse-start ARC Keeper backup ballast shall consist of EMI filters; a rechargeable, high-temperature 12 V, 1.5 Ah nickel-cadmium battery; a battery charger; a high-frequency inverter ballast; an AC power line voltage monitor; and control circuitry contained in one 12 1/4” x 7 1/4” x 1 3/4” white metal case. A solid-state charging indicator light, which is an integral part of the pulse-start ARC Keeper unit, is provided to monitor the charger to indicate the presence of battery charging current. Installation hardware shall be provided. The pulse-start ARC Keeper shall have a maximum input power of 6 W at 120 VAC, 50/60 Hz and 9 W at 208, 240, or 277 VAC, 50/60 Hz. The pulse-start ARC Keeper shall be UL Listed, CSA Certified, suitable for damp location installation and warranted for five years from date of purchase.
During normal operation, the battery charger supplies charging current to the battery while the AC power line voltage monitor monitors the line voltage waveform. The magnetic ballast* is allowed to operate the lamp as normal. When there is a voltage sag, power interruption or failure of the AC power normally supplied to the magnetic ballast,* the pulse-start ARC Keeper will detect this problem and respond within approximately two milliseconds. The pulse-start ARC Keeper will apply high-frequency power to the lamp to supplement the low-frequency 60 Hz power normally supplied to the lamp by the magnetic ballast.* In this manner, the lamp arc is maintained and kept from extinguishing. When the AC power interruption event is over, the pulse-start ARC Keeper will withdraw supplemental highfrequency power from the lamp only after the AC power line has stabilized. When AC power is restored and deemed stable, the pulse-start ARC Keeper returns to the monitoring mode as well as the batterycharging mode. If, on the other hand, there is a long-term power failure such that the power failure persists for more than two minutes, the pulse-start ARC Keeper inverter ballast will operate the lamp arc for two minutes maximum, then turn off. A full 24 hours of charge is required for full recharge. During day-to-day normal operation, the pulse-start ARC Keeper will not try to maintain the lamp arc immediately when the lamp is first turned on; rather, there will be a five-minute delay before pulse-start ARC Keeper will attempt to “catch” the arc. This delay allows the lamp to warm up each time it is turned on from a cold start. If the wall switch is turned off in order to turn the lamp off, the pulse-start ARC Keeper will recognize that switched power has been turned off but unswitched power is still applied. The pulse-start ARC Keeper will release control of the arc and allow the lamp to turn off as intended, then return to battery-charging mode.
*Compatible pulse-start magnetic ballasts include reactor style (R), high-reactance autotransformer (HX) and constant-wattage autotransformer (CWA).
The pulse-start ARC Keeper must be powered from the same branch circuit for both the switched and unswitched hot leads. The magnetic ballast* is fed from the pulse-start ARC Keeper. The pulse-start ARC Keeper may be installed in close proximity to the fixture or remote from the fixture. Remote distance is primarily limited by the ignitor used. Contact factory for remote mounting distances.
http://www.bodine.com/products/specs/ak175pls.html ; http://www.bodine.com/downloads/specs/AK175PLS.spec.(std).L2200004.pdf
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