MPT-8B-PS Metering Pulse Totalizer
The MPT-8B-PS metering pulse totalizer is designed to provide the totalized pulse values from up to eight 2-Wire (Form A) input pulse sources. A single 3-wire Form C (K, Y, & Z) solid state isolated dry contact output is provided. All inputs are additive
Typical applications include interfaces between utility metering devices and customer-owned energy control systems, demand recorder applications, and supervisory control systems (SCADA) interfaces. The MPT-8B-PS pulse totalizer may also be used as a pulse value translator if it is desirable to translate odd pulse values such as 0.1234 KWH/pulse to an even value, 0.5000 KWH/pulse. The pulse inputs of the MPT-8B-PS are configured as eight sets of Y input terminals with a common “K” input terminal.
The MPT-8B-PS provides a sense voltage of +13 VDC to the eight KY pulse sending source contacts, normally a group of meters. Each of the MPT-8B-PS’s eight inputs is allowed to have a different four-digit multiplier that can range in value from 0000 to 9999. The output multiplier is a six-digit number ranging from 000001 to 999999. Both the input and output multipliers are field-set without the use of any external devices. In addition, the minimal time between output pulses may be set in 10 millisecond increments between 20 milliseconds and 1000 milliseconds.
An LCD display contained within the unit displays the status of each input and the output as a “Y” or “Z” in normal operation. During installation and setup, the display is used to set all system parameters including pulse weight values for each input as well as the output pulse value. Also available through the LCD display are diagnostic modes that include a pulse counter for the output. Non-volatile EEPROM memory “remembers” all register values in the event of power loss. Upon power-up all register values are restored, so there is no loss of pulse counts or values.
Within the software, all inputs are first checked for the minimum contact closure duration of 20mS to assure a maximum noise rejection. The “K” lead of the MPT-8B-PS’s output is fused to prevent damage to the relay under almost any condition a user might cause such as excessive current, incorrect wiring, etc.
The MPT-8B-PS has built-in transient protection for the solid state relay contacts which eliminates the need for external or off-the-board transient suppressors. All component parts of the MPT-8B-PS, 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.
| Electrical | |
|---|---|
| Power Input: | 120 VAC, 208-277 VAC. Burden: 10 mA at 120 VAC |
| Pulse Input: |
Eight 2-Wire Form A inputs. The “K” input terminal is the common return for all meters. The “Y” input terminals are “pulled-up” to +13 VDC making them compatible with open-collector transistors, open-drain FETs or virtually any kind of KYZ switch (i.e. mechanical, electro-mechanical or solid state). Each input is optically isolated. |
| Pulse Output: |
One dry Form C contact (K, Y, & Z) for energy pulses. Factory fused at 1/4 Amp with 3AG fuses. Solid state contacts have a maximum output rating of 250 VAC/VDC at 1/2 Amp. The maximum power rating of the contacts is 100 VA, without exceeding either the maximum voltage or current rating of the solid state switch. |
| Contact Resistance: |
2.3 ohms maximum, 1.7 ohms typical |
| Operate and Release Time: | Turn-on time - 8 milliseconds typical, 20mS max Turn-off time - 1 millisecond typical, 5mS max |
| Input/Output Isolation Voltage: |
2500Vrms |
| Mechanical | |
|---|---|
| Mounting: | Any position |
| Size: | 3.50” wide, 7.20” high, 1.50” deep |
| Weight: | 1 pound |
| Temperature | |
|---|---|
| Temperature Range: | -38º C to +70º C, -38.4º F to +158º F |
| Humidity: | 0 to 98% non-condensing |
| Available Options | |
|---|---|
| Input Voltages: |
125 VDC input using the DCS-1 Power Supply. Contact factory for other input voltages. |
All specifications are subject to change without notice.
