To complement its DPP range of DIN-Rail power supplies, TDK-Lambda has introduced three-phase input models. Offered in three power levels (120W, 240W and 480W), these units are suitable for use in factory automation, industrial control systems and test equipment applications. Each power level offers two output voltages – 12VDC and 24VDC (120W) and 24VDC and 48VDC (240W and 480W). They operate from AC inputs in the 340 to 575V, 47-63Hz range without the need for switching or adjustment. A feature is the bi-phase operation; under a dropped phase condition they will continue to operate with output power derated to 80%.

All models incorporate power factor correction. Output voltages can be adjusted to allow for voltage drop in cables and similar factors and, once set, are maintained within -0 and +1% of nominal output. Load regulation is ±1% when the supplies are used individually, and ±5% when set in parallel mode. Up to two supplies can be connected in parallel for use in higher power applications. For additional convenience in control and automation applications, the 24V model includes a voltage monitoring relay. Here the 0.3A rated normally open contact closes to confirm that the supply output is between 17.6 and 19.4V, this can be used to guard against the use of devices such as sensors and solenoids at reduced voltage, when their behaviour may be unpredictable.

Further protection features include over current protection (selectable between hiccup and continuous modes on the 480W models), over voltage protection and over temperature protection with auto recovery. The operating temperature range of the supplies is between -25 and +61°C at full output, derating linearly at 2.5%/°C from 61 to 71°C. The DPP series meet EN55022 Class B EMI standards (radiated and conducted), are CE marked, and are safety-approved to UL/EN60950-1 and UL508 specifications. All models are suitable for either TS35/7.5 or TS35/15 DIN-Rail mounting, and have a robust metal case with convenient screw terminal connections.