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KYZ pulses are a "Form C" type relay; PSHD Series meters accept a "Form A" type relay. Form A has a single contact point, which Form C alternates between two contact points. The PSHD Series meters are only designed to accept Form A (single pair), so using a Form C requires an adjustment for the difference in pulses. Since only K and Y can be wired, only half the pulses of the KYZ output will be counted. This means that you must double the number of counted pulses to have an accurate total.
Here are some important definitions:
Form A: A two-wire interface using only K and Y. Referred to as single-pole, single-throw (SPST). Form A pulse values are always double Form C pulse Values
Form C: A three-wire interface using K, Y, and Z. Referred to as single-pole, double-throw (SPDT). Form C is the standard in the utility industry and can be used as Form A by only using K and Y.
Each Modbus register is only 16 bits wide and is in integer format without any fixed number of decimal points. Simply putting a value directly into one of these registers would limit the smallest number to be 1, and only allow for a maximum value of 65535. To handle larger numbers, or numbers with better resolution, we use a scalar value that is used to apply a factor to the 16-bit register value.
The answer depends on which model PowerScout you have. PowerScout 3/3+ = 5000A, PowerScout 3037 = 4000A, PowerScout 24 = 5000A, PowerScout HD = 4000A
All PowerScout meters are compatible with RoCoil current transformers.
When multiple devices are connected, the devices need to be connected in a daisy chain. A daisy chain means that all plus (+) connections are chained together and all minus (-) connections are chained together across the network.
A network containing multiple devices requires a unique address for each device. This allows the master device to identify and communicate with each slave. The BACnet/Modbus network administrator must assign a unique network address to each PowerScout 3037 using the rotary switches MSB and LSB.
Other network layouts, i.e., star, are not recommended when using the RS-485 standard.
The PowerScout meter can be used as a direct replacement for the Veris, Inc. H8035/H8036 series of networked power meters. This mirroring of the Veris Modbus register assignments makes replacement with a PowerScout meter simple. However, because the number of parameters that the Veris meters measure is less than half of what the PowerScout can measure, the other Modbus registers described in the table need to be used to utilize the additional capabilities of the PowerScout.
See Appendix C in the PowerScout 3037 Manual for additional information about Veris Emulation.
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