ARM-2003

ARM Series The ARM Series Alternating Relay is a microprocessor-based controller designed for use in dual load installations to assure equal run time on each load. LED indicators show the status of the unit’s five intrinsically safe control switch inputs, one alarm, and two load outputs. H-O-A switches, a lead select switch, and a test/clear button are provided for manual control. The ARM Series reduces the number of components required for this application by combining many functions into one unit. Process Control Equipment for Hazardous Locations 7M26 UL913 INCLUDES INTRINSICALLY SAFE INPUTS TWO PUMP SEQUENCING: Evenly distributes run time by automatically alternating lead and lag load designations when the off control switch input opens. Integrated Duplex Controller SOSO Operation (Sequence-on, Simultaneous-off) UL913 INTRINSICALLY SAFE: Control switch inputs are low voltage/ low current and are electronically isolated from the control voltage and load alarm contacts. H-O-A Switches: Hand-Off-Automatic switches allow for manual operation. ALTERNATING RELAYS & CONTROLLERS LEAD SELECT SWITCH: Disables the automatic sequencing function and allows loads to be locked into the 2-1 or 1-2 sequence. CONTROL SWITCH FAULT DETECTION: Unit detects open and shorted control switch failures. SPECIFICATIONS CONTROL VOLTAGE 24 or 120 VAC ±10%, 50/60 Hz CONTROL SWITCH Open Circuit Voltage Short Circuit Voltage 5 VDC TEST/CLEAR SWITCH: Verifies function and resets the control switch fault detection algorithm. 0.1mA ALARM OUTPUT: Alarm contacts close when a control switch fails or the system’s capacity is exceeded. INRUSH CURRENT DELAY: Reduces line sags by preventing both loads from energizing simultaneously. POWER REQUIRED 4 VA Maximum DUTY CYCLE Continuous RESPONSE Power Up 3 SEC. ±5% Inrush Current 5 SEC. ±5% CONTACT RATING (3) SPST-N.O. 10 Amp Resistive, 1/4 hp, 278 VA Inductive @ 120 VAC LED INDICATORS Designation Color State Condition Level/Alarm Red ON cs5 Closed Lag Green ON cs4 Closed Lead Green ON cs3 Closed Off Green ON cs2 Closed Aux. Off Green ON cs1 Aux./cs2 Closed Load 1 Green ON Load ON Load 2 Green ON Load ON Ctrl. Switch Red ON Failure Open/Closed LIFE EXPECTANCY Mechanical Electrical 20 Million Operations 75,000 @ Rated Load TEMPERATURE RATING Operate Storage -4° to 131°F (-20° to +55°C) -40° to 185°F (-40° to +85°C) TERMINATIONS (12) #8-32 Screw Terminals WEIGHT 16 oz. VERSATILE MOUNTING: Two (2) mounting configurations are available. The standard surface mount has top access to controls and indicators and is intended for back panel mounting. The panel mount option is intended for front panel or door cutout access to controls and indicators. SPECIAL CONTROLS: ARM-2003 and ARM-2010–Standard operation without the H-O-A switches ARM-2011–Standard operation without the Control Switch Failure feature. ORDERING INFORMATION MODEL NUMBER CONTROL VOLTAGE MOUNTING COMMENTS ARM-XXX-AFE* 24 or 120 VAC Surface ARM-XXX-AFEP* 24 or 120 VAC Panel ARM-2003 120 VAC Surface ARM-2010 120 VAC Panel ARM-2011 120 VAC Surface Standard Standard Special: w/o H-O-A switches Special: w/o H-O-A switches Special: w/o Control switch failure feature *Replace XXX with desire control voltage (24, 120) The ARM Series is UL Listed under UL File Number E151578. 196 Diversified Electronics 800.727.5646 atcdiversified.com OPERATION FOUR CONTROL SWITCHING: Do not remove factory-installed jumper between terminals 2 and 3. The control switches connected to terminals 3 through 6 are labeled OFF (CS2), LEAD (CS3), LAG (CS4) and ALARM (CS5). Under normal operation the lead load energizes when the off and lead control switches close in order. The lag load energizes when the lag closes and the alarm load energizes when the alarm switch closes. When all four switches reopen in the proper order all outputs are de-energized and the lead/lag output designations reverse. *Panel Mount Cutout ARM Series DIMENSIONS (INCHES) FIVE CONTROL SWITCHING: Remove factory installed jumper between terminals 2 and 3. After the jumper has been removed, the additional control switch is connected to terminal 2. The extra switch functions as an AUXILIARY OFF (CS1) switch. It is used to prevent loads from running continuously if the primary OFF (CS2) switch fails to open properly. *Greenlee punch #60071 or equivalent WIRING CONTROL DRAWING 190 ALTERNATING RELAYS & CONTROLLERS FAULT DETECTION ALGORITHM: If any of the control switches open or close out of order, the alarm output energizes and a fault detection algorithm is used to identify the faulty switch. The faulty switch is then ignored and the OFF, LEAD, and LAG control switch designations are altered to maintain safe operation. 1. To maintain intrinsic safety, connect the Controller’s Earth Ground Terminal 8 to the earth ground of the AC Power Supply feeder. The resistance between the Controller’s Earth Ground Terminal and Earth Ground shall be less than 1 ohm. 2. Maximum distance between Controller and switch contact is 1000 feet. 3. All intrinsically safe wiring shall be separated from non-intrinsically safe wiring. Refer to article 504 of the National Electrical Code ANSI/NFPA 70 on procedures for intrinsically safe wiring. 4. Switch contact shall be any non-energy storing or generating mechanical switch type device containing no capacitance or inductance. 5. Connections to terminals 5, 6, 9, 10, 11, and 12 are optional. If the Aux. Off switch is omitted, terminals 2 & 3 must be jumpered. Diversified Electronics 800.727.5646 atcdiversified.com 197