SPR-3
Repeating Pulse Relay

GENERAL DESCRIPTION

The SPR-3 repeating pulse relay is designed to provide three sets of isolated "dry", solid-state Form "C" (K, Y, & Z) contacts from a single field selectable Form A or C input over a wide voltage range. The SPR-3 relay is functionally equivalent to the RPR-3P exception that the SPR-3 solid state (silicon) outputs. The sense voltage (Kin) to the sending device (typically a meter) is +13 VDC. The SPR-3 may be used with meters having mechanical output contacts (relays), or high or low voltage semiconductor outputs.

Typical applications include interfaces between utility metering devices and customer owned energy control systems, demand recorder applications, and supervisory control systems (SCADA) interfaces. The SPR-3 relay has a switch selectable FormA or FormC input and input filtering circuitry to prevent noise from triggering the output. An pulses less than 18mS are considered to be noise and will not be detected as a valid pulse. Once an input pulse greater than 18mS is detected, the outputs will be changed according to the status of the input.

Bright red and green LED lamps indicate the systems status at all times thus allowing a rapid check of the system's performance without requiring any additional test equipment. The SPR-3's input and output circuit's terminal strip is a "EURO" type connector strip. When the stripped wire has been correctly installed in the terminals "slot" no conductive parts are exposed on the surface of the terminal strip, thus allowing the user maximum protection from accidental electrical shock. Each "K" lead of the SPR-3's outputs is fused to prevent damage to the relays under almost any conditions a user might cause such as excessive current, incorrect wiring, etc.

The SPR-3 has built-in MOV transient protection for the solid state (silicon) relays contacts which eliminates the need for external protection. All component parts which have power applied to them, with the exception of the input/output terminal strip are enclosed in a polycarbonate cover for maximum protection. The mounting base plate is also made of polycarbonate and offers excellent electrical insulation between the circuit and the mounting surface. The input "Kin, Yin, & Zin" leads may be paralleled with other RPR-2P or 3P relays to increase the number of available isolated outputs.

SPR-3 SPECIFICATIONS

ELECTRICAL

Input	90 to 325 VAC. Burden: 10 MA. at 120 VAC
Signal Input	One switch selectable FormA or FormC input. "Kin" terminal wetted with +13VDC. Input has "Yin" and "Zin" input terminals for pulse signal from meter. "Yin" terminal used for 2-Wire mode. Both used for 3-Wire.
Output	Three sets of "dry" form "C" contacts (K, Y, & Z) for energy pulses. The contacts are solid state rated at 250VAC/400VDC at 100milliamps. The maximum rating of the contacts is 800mW. Each output is factory fused at 1/10 amp. (3AG)
Contact Resistance	25 ohms maximum, 18 typical
Insulation Resistance	50 megohms typical
Operate and Release Time	1 to 2 milliseconds typical
Input/Output Isolation Voltage	3750V

MECHANICAL

Mounting	Any position
Size	3.50 inches wide, 7.20 inches high, 1.50 inches deep
Weight	17 ounces

TEMPERATURE

Temperature Range	-38° C to +70° C, -36.4° F to +158° F
Humidity	0 to 98% non-condensing

OPTIONS

Input Voltages

125 VDC input using the DCS-1 Power Supply. Contact factory for other input voltages.