PTR-1
Pulse Transmitting Relay

GENERAL DESCRIPTION

The PTR-1 pulse transmitting relay is designed to transmit KYZ pulses over long distances up to approximately 4 miles. It provides a 2-wire current loop output and must be connected to an CLR-1, CLR-2 or CLR-3 to receive the pulses. These units replace the GE DC-1 Power Supply and S-4 Relay for long distance pulse transmission.

The PTR-1 contains a 3-Wire Form "C" input (K, Y, & Z). The sense voltage (K) to the data sending circuit (typically a meter) is +13 VDC. Each time the input changes state, the polarity of the current loop is reversed causing the receiving relay at the remote end of the cable to switch to the opposite state.

The PTR-1 has a built-in low voltage transformer isolated powered power supply. and 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 PTR-1 relay is designed to retain the last valid input status upon loss of the system's power thereby preventing false outputs from occurring. An incorrect sequence of input pulses is detected and only the first valid pulse will result in an output.

Bright red and green LED lamps indicate the system's status at all times thus allowing a rapid check of the system's performance without requiring any additional test equipment. The PTR-1'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. Due to the inherent current-limited nature of the design, no fusing is necessary on the output. No damage will result if the current loop is shorted.

The PTR-1 has built-in MOV transient protection for the mercury-wetted relay contacts as well as for the current loop, eliminating the need for external surge suppression. 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.

PTR-1 SPECIFICATIONS

ELECTRICAL

Power Input	90 to 325 VAC. Burden: 10 MA. at 120 VAC
Output	Three sets of "dry" form "A" or form "B" contacts (K & Y or K & Z) for selected by a user changeable board jumper for time or energy pulses. The contacts are mercury wetted "no bounce" relays rated at 500 VDC or 350 VAC 2 Amps. break, 5 amps carry. The maximum rating of the contacts is 100 VA. Factory fused at 1/2 amp. (3AG)
Contact Resistance	50 milliohms maximum, 12 to 14 typical
Insulation Resistance	50 megohms typical
Operate and Release Time	1 to 2 milliseconds typical

MECHANICAL

Mounting	Within 30 degrees of vertical
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.