Limiting peak demand with IF-THEN rules on a power meter concentrator
How demand is measured, how to build staged load-shedding rules on a PMC or PMD concentrator, and a worked example with relay outputs.
Power meters, current transformers and concentrators for sub-metering, load monitoring and energy reporting.
Energy management starts with measurement. To see where energy is used, compare consumption over time or document savings, you need meters on the relevant circuits and a way to collect their data. ICP DAS supplies both: single-phase and three-phase power meters with current transformers (CTs), and concentrators that read many meters and pass the data on to SCADA, databases or cloud platforms.
The PM series power meters measure voltage, current, power, power factor and energy on single-phase and three-phase circuits. Many models are supplied with matching current transformers, sized from small branch circuits to several hundred amperes. The meters communicate over Modbus RTU, with Modbus TCP and other interfaces on selected models, so any controller, BMS or SCADA system that supports these protocols can read them.
A concentrator polls a group of meters and makes their data available in one place. The PMC series, and the PMD series with a built-in touch panel, collect data from ICP DAS meters, log it to a memory card and pass it on over Modbus TCP, MQTT, SNMP or FTP, depending on the model. Built-in IF-THEN-ELSE rules can switch loads off when demand approaches a limit. That gives a compact energy monitoring system without a separate server, or a clean data source for an existing SCADA.
Where cabling to every meter is impractical, iWSN wireless current sensing modules report to a concentrator over a wireless sensor network. For temporary measurements, a portable power monitoring kit packs the metering hardware into a carrying case.
To measure high voltages and currents with standard analog input modules, voltage attenuators and current transformers from the DNM-800 range convert the signals to levels the I/O can read safely.
Three-phase PM series meters with current transformers are fitted on the main incomer and on the feeders to each production line. A PMC concentrator reads them over RS-485, logs the values locally and sends them by MQTT to the energy reporting system. If the connection fails, the log on the memory card is sent once it is restored, so no data is lost.
We can help size meters and current transformers from a single-line diagram or a list of circuits.
The CA-SCT16I-100A-L080 is a split-core current transformer for measuring AC current on existing conductors. Its split design lets it be clamped around a cable without disconnecting the circuit, which suits retrofit energy monitoring. It provides one channel with a 100A rating and a Φ16mm aperture.This variant is intended for use with the iWSN and iXN series. The 8 m wire gives room to route the sensor from the conductor to the measuring device. The source data states a maximum input voltage of 500 VAC at 50/60 Hz.Accuracy is specified as 1% for the CT alone. When used with iWSN-1110X, iWSN-1131P, iWSN-750P or iWSN-757P, the stated accuracy is ±3% or ±0.3 A. The unit is RoHS and WEEE certified.ApplicationsCurrent measurement for power metering with iWSN and iXN series systemsRetrofit energy monitoring on existing conductors
The CA-SCT24I-200A-L080 is a single-channel split-core current transformer rated at 200A, with a Φ24mm aperture. Its split-core construction lets it be fitted around an existing conductor, which suits retrofit metering work where the circuit cannot easily be disconnected.Supplied with an 8 m lead, this CT is intended for use with the iWSN and iXN series. The maximum input voltage is 500VAC at 50/60Hz. Accuracy is rated at 1% for the CT alone, and at ±3% or ±0.3A when used with the iWSN-1110X, iWSN-1131P, iWSN-750P and iWSN-757P.Choose this variant when you need a 200A-rated CT with a Φ24mm aperture and an 8 m lead for iWSN or iXN metering installations.ApplicationsEnergy managementPower meteringCurrent monitoring on iWSN and iXN series installations
The CA-SCT36I-400A-L080 is a single-channel split-core current transformer for energy management and power metering. Its Φ36mm opening takes conductors up to a 400A rating, and the split core fits around an existing cable without disconnecting the circuit.This variant is specified for use with the iWSN and iXN series. The 8 m wire gives room to route the sensor from the conductor to the measuring device. Accuracy is 0.5% for the CT alone, and the source lists a combined accuracy of +-3% or +-0.3A when used with iWSN-1110X, iWSN-1131P, iWSN-750P and iWSN-757P.Single-channel split-core CT for retrofit installation400A rating through a Φ36mm apertureMaximum input voltage 500VAC, 50/60HzApplicationsEnergy managementPower metering with iWSN and iXN series devices
The DGW-521 CR is a DIN-rail gateway that lets a host PC, PAC or TouchPAD control DALI lighting devices over serial or USB. It accepts Modbus RTU and DCON from RS-232, RS-485 or USB and translates them to DALI, so existing serial-based control software can address a DALI lighting network without a separate DALI controller.A built-in DALI power supply (16 VDC ±5%, maximum 250 mA) can be switched on or off, which suits installations where the DALI bus is already powered elsewhere. The ID code can be set over the RS-485 interface, which simplifies commissioning. DALI isolation is rated at 1500 VDC.The gateway is intended for DALI lighting systems covering small areas. DALI signal cables must not exceed 300 m. The unit carries CE, UKCA, FCC, RoHS and WEEE marks. The USB driver is listed for Windows XP and Windows 7 only.ApplicationsLighting control for small DALI installationsHost PC, PAC or TouchPAD access to DALI devicesSerial-to-DALI integration in building automation
How demand is measured, how to build staged load-shedding rules on a PMC or PMD concentrator, and a worked example with relay outputs.
How to choose single-phase, three-phase or multi-circuit Modbus power meters, size the current transformers and pick Modbus RTU or TCP.
How PMC and PMD concentrators poll power meters, log to microSD, resend data after network outages and deliver it over Modbus TCP, MQTT, SNMP or FTP.
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