The SPR-2 repeating pulse relay is designed to provide two 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-2 relay is functionally equivalent to the RPR-2P, but contains solid state outputs. The sense voltage between the SPR-2 and the sending device (typically a meter) is +13 VDC. The SPR-2 may be used with meters having high or low voltage semiconductor outputs, or mechanical output contacts (relays).
Applications include interfaces between utility metering devices and customer-owned energy control systems, demand recorders or supervisory control (SCADA) systems. The SPR-2 relay has a switch-selectable Form A or Form C input and input filtering circuitry to prevent noise from triggering the output. Pulses less than 18 mS are considered to be noise and will not be detected as a valid pulse. Once an input pulse greater in length than 18 mS is detected, the outputs will be changed to the state of the input.
Bright red and green LED indicators the system’s status at all times, thus allowing a rapid check of the system’s performance without requiring any additional test equipment. The SPR-2’s input and output circuit’s terminal strip is a “Euro” type connector strip. When the stripped wire has been correctly installed in the terminal’s 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-2’s outputs is fused to prevent damage to the relays under almost any condition a user might cause such as excessive current, incorrect wiring, etc.
The SPR-2 has built-in MOV transient protection for the solid state relay contacts that 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 SPR-2 is normally mounted inside another enclosure, suitable for the user’s intended application.
| Input | 120, 208-277 VAC. Burden: 10 MA. at 120 VAC |
| Signal Input | One switch selectable Form A or Form C input. “Kin” terminal is common return. Input has “Yin” and “Zin” input terminals are “pulled up” to 13VDC for pulse signal from meter. “Yin” terminal used for 2-Wire mode. Both used for 3-Wire. |
| Output | Two sets of dry Form C contacts (K, Y, & Z) for energy pulses. The contacts are solid state, rated at 250VAC/VDC at 100milliamps. The maximum power rating of each contact is 800mW. Each output is factory fused at 1/10 amp. (3AG) |
| Contact On-State Resistance | 25 ohms maximum, 18 typical |
| Insulation Resistance | 50 megohms typical |
| Operate and Release Time | 2 to 3 milliseconds typical |
| Input/Output Isolation Voltage | 2500V |
| Mounting | Any position |
| Size | 3.27 inches wide, 5.70 inches high, 1.50 inches deep |
| Weight | 6 ounces |
| Temperature Range | -38° C to +70° C, -36.4° F to +158° F |
| Humidity | 0 to 98% non-condensing |
| Input Voltages | Contact Factory |