Zero Current Switching (ZCS) ensures that a relay contact is closed at the zero crossing and opened at the precise moment when zero current flows through it. This has a number of advantages for smart power devices using relay switching techniques. With less potential harm from inrush currents, there is less wear on the relay itself and greater protection for connected switch mode power supplies (SMPS). There is also significantly reduced electromagnetic interference from repeated switching On/Off. Opening a relay contact when the current is zero is important for inductive loads (motors, transformers) but less so for capacitive loads including switch mode power supplies (SMPS) of the type found in computers, servers and IT network peripherals.
Smart PDUs
Smart Power distribution units feature one or two features that raise their before over a standard or basic PDU. Smart devices such as the PowerPDU are small PDUs with four IEC320-C13 power outlets that can be individually controlled and monitored over an IP/Ethernet connection via a LAN browser, software application or Cloud-based portal.
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Netio Smart PowerPDUs
These are small smart power devices 1U high that can be installed into server rack cabinets either horizontally or vertically. Each unit has four IEC320-C13 outlets.
The individual outlets on the PowerPDU-4PS can be remotely switched ON/OFF. Each power output supports ZCS (Zero Current Switching) to protect connected devices.
The PowerPDU-4C provides individual controlled (ON/OFF/RESET/TOGGLE) and monitored (metered) outlets. Electrical measurements include Volts (V), Amps (A), Energy (kWh), True Power (Watts), Frequency (Hz) and the true Power Factor (pf) for each power outlet.
Output power can be controlled using a local web interface or a M2M API protocol including REST API, SNMP, MQTT, MODBUS/TCP and others. Custom Lua scripts can be run directly on the PowerPDU-4C. The PowerPDU-4C also has a built-in RS-232 port (green 3-pin terminal block) that can be controlled with a Lua script or used as a TCP tunnel (remote serial port).
PowerPDUs can be connected to the NETIO Cloud internet portal. NETIO Cloud is provided free of charge and uses SSL security and a European-based datacentre.
Typical Applications
PowerPDUs are intended for use in server racks to power servers, networking devices and peripherals, telecomms, mobile and communications devices. They can help to increase the management of both on-site and remote site installations and provide the facility for local power and energy measurement as well as reboots and power cycling.
PowerPDU Features
| Range | LAN RJ45 Ports | WiFi | IQRF | Outlets | ZCS/ZVS | Metering/Metrics | Web-based Management | RS232 Port | Netio Cloud | Scheduler | WatchDog | M2M APIs |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PowerPDU-4C PDUs | 2 | – | – | 4 x C13 IEC320 | ZCS | Yes/22 | Yes | Yes | Yes | Yes | Yes | 13 |
| PowerPDU-4PS PDUs | 1 | – | – | 4 x C13 IEC320 | ZVS | – | Yes | – | Yes | – | – | XML, JSON, URL API, Modbus/TCP, Telnet, MQTT-flex, SNMPv1 |
Note: ZCS stands for Zero Current Switching. ZVS stands for Zero Voltage Switching.
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