Vision Metering LLC VM1991 Manual Do Utilizador
7 Ross Cannon Street - York, SC 29745 - Phone (803) 628-0035 - Fax (803) 628-0282 - info@visionmetering.com –
www.visionmetering.com
7
Vision Meter Operating Manual
Singlephase & Network
Vision Metering
software versions may not be compatible with later firmware configurations. In order to ensure
full functionality, please match software and firmware version when modifying meter
configuration.
Energy Registration
The Vision meter can be configured to display kWH consumption in a number of
different manners. The options for kWH accumulation are:
different manners. The options for kWH accumulation are:
1. kWH Delivered (Unidirectional) - Energy is only accumulated in the forward
direction only. If current flow is reversed through the meter, the kWH value still
increments in the forward direction. This is the default setting and most secure
configuration.
increments in the forward direction. This is the default setting and most secure
configuration.
2. kWH Delivered – Energy is only accumulated in the forward direction. Reverse
current flow is not included in the display. This option is enabled by selecting
“Reverse Allowed” in the Vision 20/20 software and only displaying kWH
delivered.
“Reverse Allowed” in the Vision 20/20 software and only displaying kWH
delivered.
3. kWH Received-Reverse current is accumulated and displayed as a separate
register.
4. kWH Net-Meter displays kWH Delivered minus kWH Received
Instantaneous Demand
The Vision meter can be configured to display Instantaneous Demand in the center of
the bottom row of the LCD display. This is a real time kW indication that is updated
once per second. This display auto ranges from 0 to 3 decimals depending on the
magnitude of the instantaneous demand value.
the bottom row of the LCD display. This is a real time kW indication that is updated
once per second. This display auto ranges from 0 to 3 decimals depending on the
magnitude of the instantaneous demand value.
Calibration/Accuracy testing
Vision meters are calibrated to +/-0.2% prior to shipment therefore no user calibration
is required. Accuracy testing can be accomplished using standard watthour test
equipment which utilizes LED pickups.
Watthours per pulse output from the LED is shown on the meter nameplate as K
is required. Accuracy testing can be accomplished using standard watthour test
equipment which utilizes LED pickups.
Watthours per pulse output from the LED is shown on the meter nameplate as K
T
.
Meters may have both a K
T
and a K
h
value in some cases. When only one value is
present, K
T
and K
h
are equivalent. Full load accuracy testing is performed at the
nameplate test amps (TA). Light load testing is performed at 1/10 the full load value.
Once the test board is set up using the nameplate parameters, the meter can be tested
by following the manufacturer’s recommended test procedure. The Vision meter
should never require calibration after initial factory calibration.
Once the test board is set up using the nameplate parameters, the meter can be tested
by following the manufacturer’s recommended test procedure. The Vision meter
should never require calibration after initial factory calibration.