Noise And Impedance Effects; Inductive Loads; Making The Load Connections - TDK-Lambda Genesys GEN8-300 User Manual

3.9.4 Noise and Impedance Effects

To minimize the noise pickup or radiation, the load wires and remote sense wires should be twisted-
pairs to the shortest possible length. Shielding of sense leads may be necessary in high noise
environments. Where shielding is used, connect the shield to the chassis via a rear panel Ground
screw. Even if noise is not a concern, the load and remote sense wires should be twisted-pairs to
reduce coupling, which might impact the stability of power supply. The sense leads should be
separated from the power leads.
Twisting the load wires reduces the parasitic inductance of the cable which could produce high
frequency voltage spikes at the load and the output of power supply, because of current variation in
the load itself.
The impedance introduced between the power supply output and the load could make the ripple
and noise at the load worse than the noise at the power supply rear panel output. Additional filtering
with bypass capacitors at the load terminals may be required to bypass the high frequency load
current.

3.9.5 Inductive loads

Inductive loads can produce voltage spikes that may be harmful to the power supply. A diode should
be connected across the output. The diode voltage and current rating should be greater than the
power supply maximum output voltage and current rating. Connect the cathode to the positive
output and the anode to the negative output of the power supply.
Where positive load transients such as back EMF from a motor may occur, connect a surge
suppressor across the output to protect the power supply. The breakdown voltage rating of the
suppressor must be approximately 10% higher than the maximum output voltage of the power
supply.

3.9.6 Making the load connections

WARNING
Hazardous voltages may exist at the outputs and the
load connections when using a power supply with a
rated output greater than 40V. To protect personnel
against accidental contact with hazardous voltages,
ensure that the load and its connections have no
accessible live parts. Ensure that the load wiring
insulation rating is greater than or equal to the
maximum output voltage of the power supply.
CAUTION
Ensure that the load wiring mounting hardware does
not short the output terminals. Heavy connecting
cables must have some form of strain relief to prevent
loosening the connections or bending the bus-bars.
8V to 100V Models
Refer to Fig.3-6 for connection of the load wires to the power supply bus-bars and to Fig.3-7
for mounting the bus-bars enclosure to the chassis.
Bei Stromversorgungen mit einer
Nennausgangsspannung von mehr als 40V können
an den Ausgängen und den Verbindungen zur Last
gef hrliche Spannungen anliegen. Um den
ä
Anwender vor einem versehentlichen Kontakt mit
gefährlichen Spannungen zu schützen, stellen Sie
sicher, dass die Last und ihre Verbindungen keine
ber hrbaren spannungsführenden Teile aufweisen.
ü
Stellen Sie auch sicher, dass die Isolierung aller
Kabel mindestens für die maximal mögliche
Ausgangsspannung des Netzteils ausgelegt ist.
Stellen Sie sicher, dass über die Anschlussleitungen
zur Last kein Kurzschluss der Ausgangsklemmen
erfolgen kann. Schwere Anschlusskabel benötigen
eine Zugentlastung, um zu verhindern, dass sich
Verbindungen lösen oder die Stromschinen
verbiegen.
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WARNUNG
VORSICHT