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EMI
(Conducted)
The UltraFlex power supply has internal EMI filtering, and complies with EN55022 level B, as
well as FCC Docket 20780 Part 15, Subpart J Class A. The end system wiring and grounding
can influence the conducted and radiated EMI pattern. The customer may require additional
EMI filtering to meet system requirements. If problems are encountered, the customer should
contact Lambda’s Application Engineering Staff.
INPUT TRANSIENT/ESD PROTECTION
The UltraFlex is designed to withstand surges, line transients, and ESD as specified in the
following documents:
Surge:
IEEE-C62.41, Category A3;
EN61000-4-5 Class 4; L-L: 2KV, L-Gnd: 4KV, Criterion B.
Fast Transients:
EN61000-4-4, Level 3, Criterion B.
ESD:
EN61000-4-2, Level 3, Criterion B.
Input Dips and Variations: IEC1000-4-11, Criterion B.
Radiated Immunity:
EN61000-4-3, Level 3, 10 V/M.
REMOTE SENSE
Remote sense is provided for each output to compensate for load cable drops from the power
supply to the sense points. To meet specifications and output voltage set point of the output
modules, the sense lines must be connected to the load or locally to the power supply output
terminals. The remote sense connections are available on the signal connector. See Table 2
below for the appropriate pin numbers.
Table 2
Single Output Modules
Dual Output Modules
J1 pin 1 + Positive Remote Sense
J2 pin 2 - Negative Remote Sense Output 1
J1 pin 10 – Negative Remote Sense
J2 pin 3 +Positive Remote Sense Output 1
J2 pin 4 +Positive Remote Sense Output 2
J2 pin 5 - Negative Remote Sense Output 2
The following rules should be observed when using remote sense:
1)
Use a twisted pair of 20-24 AWG wires for remote sense leads.
2)
Route the sense leads away from any high current conductors or devices
(motors, transformers, etc.) to avoid pick-up, as this may cause ripple or stability
problems on the power supply.
3)
Never disconnect the power supply output power connections with the remote
sense still connected to the load. This may damage the internal remote sense
pick-up resistors.
4)
The total voltage drop on the output cables must be limited to less that 0.5V.
