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Z207085-0C
Troubleshooting / Resolución de problemas / Dépannage /
故障排查
/ Fehlerdiagnose
9
Problem
Cause
Solution
LEDs do not light.
Meter is not receiving adequate power.
Verify that the meter has the required voltage between phase A and B voltage inputs.
Verify the Status LED is blinking green.
Check the fusing.
Data returned from the
meter is inaccurate.
Incorrect setup values.
Verify that the CT size entered on the CT Amps rotary control is correct.
On communicating meters, check the power meter setup parameters (CT and PT ratings, system type,
etc.). See the Configuration Tool, Modbus Point Map or BACnet Objects List.
Incorrect voltage inputs
Check power meter voltage input terminals to verify adequate voltage and correct phase connections.
Power meter is wired improperly.
Check all CTs and PTs to verify correct connection to the same service, PT polarity, and adequate
powering.
Check that the CT and voltage inputs are properly associated (Phase A voltage is connected to the Phase
A CT, etc.).
See the Wiring section for more information.
Cannot communicate
with power meter from
a remote computer.
Power meter address is incorrect.
Verify that the meter is correctly addressed on the address rotary controls (see the Wiring section for more
information).
Baud rate is not supported.
Verify that the baud rate used on the bus is supported by the meter (see “RS-485” on page 8). If the meter
cannot determine which baud rate is being used, it will stay in auto-baud mode, blinking amber on the
Rx LED.
Protocol is not supported.
Verify that the protocol used on the bus is supported by the meter (see “User Interface” on page 9). The
meter supports Modbus and BACnet MS/TP protocol.
Communications lines are improperly
connected.
Verify the power meter communications connections (see “RS-485” on page 8).
Verify the terminating resistors are properly installed on both ends of a chain of units. Units in the middle
of a chain should not have a terminator.
Verify biasing resistors are installed on a single place on the bus.
Verify the shield ground is connected between all units.
Verify the shield ground is connected to earth at a single point on the bus.
Incorrect CT polarity
(bi-directional
applications only)
CT orientation not correctly installed toward
the load.
The user sets bits to invert the polarity of individual CT inputs (see Modbus register 4174). Inverting the
CT polarity changes the sign (direction of energy flow) of real (active) power (in watts) reported for that
phase in the bi-directional data set. It will also change the lead or lag indication reported by the sign of
reactive power (VAR) in the bi-directional data set.
Incorrect voltage to CT
orientation
The phase CT is not on the same wire that is
connected to voltage input for that phase.
The reported real (active) power will be
inaccurately low and the reactive power
high, resulting in a low Power Factor warning
or alarm (see LED section and Error Bitmap
Modbus register 4196).
The CT inputs may be re-assigned to different phases (see Modbus registers 4175 to 4177). Both the
power and energy calculations in the uni- and bi-directional data sets will be rendered inaccurate by
incorrect voltage-to-CT association. Note that the order of the phases does not affect the total energy
calculated for the circuit, so it is not necessary to fix phase order, just voltage-to-CT association to obtain a
correct power and energy calculation.
Problema
Causa
Solución
Los LEDs no encienden. El medidor no recibe la corriente adecuada.
Compruebe que el medidor tiene el voltaje requerido entre las entradas de voltaje de las fases A y B.
Verifique que el LED de estado parpadea en verde.
Revise los fusibles.
Los datos que emite el
medidor son inexactos.
Valores de configuración incorrectos.
Verifique que el valor nominal del CT que se introdujo en el control giratorio de amperios del CT sea correcto.
En medidores de comunicación, revise los parámetros de configuración del medidor de potencia (valores
nominales de CT y PT, tipo de sistema, etc.). Vea la herramienta de configuración, el mapa de puntos de
Modbus o la lista de objetos de BACnet.
Entradas de voltaje incorrectas
Revise los terminales de entrada de voltaje del medidor de potencia para verificar las conexiones de
voltaje adecuado y corrección de fase.
El medidor de potencia está cableado
incorrectamente.
Revise todos los CTs y PTs para verificar su correcta conexión al mismo servicio, la polaridad del PT y la
alimentación eléctrica adecuada.
Compruebe que las entradas del CT y de voltaje estén correctamente asociadas (el voltaje de la Fase A
está conectado al CT de la Fase A, etc.).
Vea la sección Cableado para más información al respecto.
