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24 VDC Loop Power Supply Operation Manual MANUAL REV 9 INTRODUCTION The 24VDC Loop Power Supply (24VDCLOOP) is a portable battery powered loop power supply. It is ideal for sites where power is unavailable. The low noise regulated output is suitable for use with smart transmitters. Power is automatically turned off when load is removed, preserving battery life. Outputs feature short circuit protection. Three LEDs indicate power, fault and low battery status. A protective boot and two AA, Alkaline batteries are included. QUICKSTART/OPERATION DIAGRAM Output Terminals: 24VDC output. Observe correct polarity. Must be connected to load for On Key to function. Green LED: On when loop is powered. Red LED: On when not able to maintain 24V output. A short circuit or low loop impedance will also cause this LED to illuminate. Yellow LED: On when batteries are nearing depletion. To avoid damage to rechargeable batteries, remove when this LED is illuminated. ON Key: Press to turn power on when connected to a loop. Output will not be enabled unless a load is connected to the output terminals. Auto-Off & Power Hold Function: When the loop is connected, press the On key to enable the output voltage. The 24VDCLOOP does not have an Off switch. When testing is complete, simply disconnect the loop and the unit will turn off automatically. If the loop is re-connected within approximately 30 seconds, the unit will power on automatically. Batteries The 24VDCLOOP uses 2 (two) AA batteries. Recommended batteries are Lithium (nonrechargeable), Alkaline, or NiMH (rechargeable). To avoid damage by over-discharging, rechargeable batteries should be removed when the Yellow Low Battery LED illuminates. Non-Rechargeable batteries may continue to be used until the Red Fault LED illuminates, at which time the output voltage will have fallen below 24 V. Approximate Battery Life (Typical) (Conditions: 12 mA loop current, 23°C) Battery Chemistry Type Examples Typical Battery Life (hours) NonRechargeable Energizer Ultimate 14.5 (10 hours at -20° C) Low Battery indication (Yellow LED) Lithium Rayovac Max Plus 815 NonRechargeable Alkaline Duracell MN1500 2 minutes remaining at 24 V output 5 minutes until output drops below 18 V 30 minutes remaining at 24 V output 6 40 minutes until output drops below 18 V Energizer E91, EN91 NiMH Rechargeable NiMH, Rechargeable Low Self Discharge Energizer recharge 9 Remove batteries immediately Sanyo Eneloop 7.5 Remove batteries immediately CAUTION: Do not use AA sized, 3.6 V Li-Ion batteries in the 24VDCLOOP. Doing so will damage the device. Battery Replacement Remove the protective boot and slide the battery cover off. Replace the batteries, taking care to note the correct polarity. For best results, always replace batteries in pairs. Do not mix fresh and old batteries or batteries of different types. CAUTION: To avoid damage by over-discharging, rechargeable batteries should be removed immediately when the Yellow Low Battery LED illuminates. Electrical Specifications / Mechanical Specifications Output Voltage _ _ _ _ _ _ _ _ _ _ _ _ _ 24 VDC ± 1% Output Voltage Ripple _ _ _ _ _ _ _ _ < 14 mV rms Load Regulation _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ < 1% Rated Output Current _ _ _ _ _ _ _ _ _ 25 mA Short Circuit Protection _ _ _ _ _ _ _ Continuous Connections _ _ _ _ _ _ _ _ _ _ _ _ _ 4 mm banana jacks Operating Temperature _ _ _ _ _ _ _ - 20 to 50°C (- 4 to 122°F) Storage Temperature _ _ _ _ _ _ _ _ _ -40 to 75°C (-40 to 167°F) Operating Humidity _ _ _ _ _ _ _ _ _ _ 95% Relative, non-condensing Power Supply _ _ _ _ _ _ _ _ _ _ _ _ _ _2 x AA batteries, (alkaline 1.5V included) Overall Dimensions _ _ _ _ _ _ _ _ _ _ 4.8” x 3.1” x 1.2” Weight _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 200 g (0.44 lbs) including alkaline batteries Enclosure Rating _ _ _ _ _ _ _ _ _ _ IP40 Housing _ _ _ _ _ _ _ _ _ ABS Protective Boot _ _ _ _ Silicone Rubber Certifications: Transcat declares that the 24VDCLOOP is in accordance with the Electromagnetic Compatibility Directive per our declaration. Warranty Transcat warrants the 24VDCLOOP to be free from defects in material and workmanship under normal use and service for 1 year from date of purchase to the original purchaser. It does not apply to batteries or when the product has been misused, altered or damaged by accident or abnormal conditions of operation. For warranty service, call customer service at (800) 828-1470 or (585) 352-9460. Please have your model number, serial number, date of purchase and reason for return. You will receive instructions for returning the device to Transcat. Transcat will, at our option, repair or replace the defective device free of charge and the device will be returned, transportation prepaid. However, if it is determined that the failure was caused by misuse, alteration, accident or abnormal condition of operation, you will be billed for the repair. TRANSCAT MAKES NO WARRANTY OTHER THAN THE LIMITED WARRANTY STATED ABOVE. ALL WARRANTIES, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE, ARE LIMITED TO A PERIOD OF 1 YEAR FROM THE DATE OF PURCHASE. TRANSCAT SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT, TORT OR OTHERWISE. TRANSCAT 35 Vantage Point Drive, Rochester, NY 14624 Phone: 800-828-1470 or 585-352-9460 Fax: 800-395-0543