Loop Alarm™ Model SC1490 and SCL1490 INSTALLATION INSTRUCTIONS LOVE ® December, 2004 LOVE CONTROLS a Division of Dwyer Instruments, Incorporated PO Box 338 ❍ Michigan City, IN 46361-0338 (800) 828-4588 ❍ (219) 879-8000 ❍ FAX (219) 872-9057 www.love-controls.com Page 1 of 8 949-0531 Rev.
Getting Started 1.) Using a small screwdriver, ball point pen, etc. set the Input Switch (SW-1) on the side of the unit for the input range to be used. 2.) Set the Output Switch (SW-2) for the output responses required (see Output Programming on page 4). 3.) Mount unit into panel. (see Mounting on page 5). 4.) Connect unit to input signal, output signal, and power wiring (see Wiring on page 5). 5.) Check calibration (See Calibration on page 6).
INPUT PROGRAMMING Switches 1 through 6 on SW1 allow selection for RTD type. Use the chart (Figure 1, below) to select the input type and range for your process. Turn on the appropriate switch(s) (as indicated) on SW1 for the input range desired. Figure 1 December, 2004 Page 3 of 8 949-0531 Rev.
OUTPUT PROGRAMMING Since the alarms can be set for reverse or direct action, high or low function, and has normally open and normally closed contacts; the number of combinations of actual output behavior is quite large. First, decide how you want the outputs to behave. Will the relay energize or de-energize at the trip point? Will the relay trip on an increasing or decreasing signal? Is the dead band above or below the trip point? It is important to answer these questions before setting up the module.
Figure 3 WIRING Mount on DIN rail and wire per Figure 5 below. INPUT RTD + MADE IN U.S.A. LOVE CONTROLS DIV. OF DWYER INSTRUMENTS, INC. MICHIGAN CITY, IN 46361, U.S.A. 290-2888 T/C,V & I 1 2 3 4 5 6 N.C. COM N.O. ALARM A ALARM B S/N: MODEL: TM N.C. COM N.O. 7 8 9 10 11 12 POWER For SC1490, power is 85 to 265 Vdc/Vac 50 to 400 Hz. For SCL1490 power is 12 to 24 Vdc/Vac 50 to 400 Hz. ±20%. Figure 4 WARNING: Do not attempt to operate this device with the cover removed.
ALARM CALIBRATION NOTE: Allow the module and socket to come to stable temperature before proceeding. For best results, allow the module to be powered in the socket for at least 20 minutes. Refer to Figure 5 when using the following procedure: 1. Apply the appropriate input for the desired alarm trip point. 2. Adjust the alarm AL screw for relay trip (LED changes color). 3. Adjust the alarm DB screw to the full clockwise position. Change the input to the desired reset point.
SPECIFICATIONS Power Supply: SC1090: 85 to 265 Vdc/Vac 50 to 400 Hz. SCL1090: 12 to 24 Vdc/Vac 50 to 400 Hz. ±20% Isolation: 1500 V rms between outputs, input, and power. Set Points: Adjustable 0 to 100% of span. Deadband: Adjustable 0.25% to 100% of span. Drift: ±0.02% / °C typical, ±0.05% / °C maximum. Ambient Temperature Range: Operating: 0° to 55° C (32° to 131° F) Storage: -40° to +80°C (-40° to +176°F) Humidity Conditions: 0 to 90% up to 40 °C non-condensing, 10 to 50% at 55 °C non-condensing.
NOTES 949-0531 Rev.
