Pulse Outputs; Pulse Initiator Output; Communications; Mode 1:Quadrature Pulse - Landis+Gyr FOCUS KWH Technical Manual

8.

Pulse Outputs

Pulse Initiator Output

The Focus kWh offers one optional solid-state KYZ output. The solid-state pulse initiator output emits
pulses in accordance with +kWh, -kWh or added kWh as configured by the user. The pulse output-
scaling factor is programmable by the user. Each KYZ output relay is assigned an independent Ke
constant that represents the quantity of energy for the output pulse. The meter is programmed with a
Ke value in units per pulse depending on the functionality of the relay. The minimum value of Ke is
Kh/12 and is selectable in increments of meter Kh/12. A value of zero disables the KYZ output. All
energy measured by the meter is accounted for in the KYZ pulses emitted by the meter for all valid Ke
values. Ke scaling factor can be modified through the optical configuration port using the
Configuration Tool
.
The unterminated KYZ output cable passes through a hole in the 6 o'clock position in the meter base.
The pulse initiator output responds in accordance with energy delivered to the load. No pulses are
emitted when energy is received from the load.
The pulse initiator option is user installable in a meter shop environment.

Communications

Focus kWh provides two scalable TTL-level pulse outputs for interfacing with pulse accumulating AMR
modules. Each output is user configurable to function in one of two operating modes.

Mode 1:Quadrature Pulse

AMR pulse output #1 responds to energy accumulation in the +kWh register. AMR pulse output #2
responds to energy accumulation in the –kWh register. The relative timing of the two pulses satisfies
the requirements of a disk pickup application with the ability to determine the direction of disk rotation.
The energy represented by each pulse is scaled by the meter's Ke value.
Mode 2: Differential +kWh Pulse
AMR pulse outputs #1 & #2 respond to energy accumulation in the +kWh register. The output #2
pulse polarity is opposite of the output #1 pulse polarity (consistent with form C outputs). The energy
represented by each pulse is scaled by the meter's Ke value.
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