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FPS1000 Instruction Manual
3.7.3 Noise and Impedance Effects
To minimize the noise pickup or radiation, the load wires and remote sense wires should be twisted-pairs
of the shortest possible length. Shielding of the sense leads may be necessary in high noise environments.
Even if noise is not a concern, the load and remote sense wires should be twisted-pairs to reduce coupling
between them, 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.
3.7.4 Inductive loads
To prevent damage to the power supply from inductive kickback, 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. 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.
3.7.5 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 it's connections has 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.
3.7.6 Front panel controls and indicator
1
2
3
4
5
1: Handle
Fig. 3-1: FPS1000 front panel
2: DC OK green LED, on when the output
voltage is above 80% +/- 5% of its rated value.
1
2
3 4
6
5
3: DC Fail red LED, on when the output voltage
is lower than 80% +/- 5% of its rated value.
4: AC OK green LED, on when the input
voltage is higher than 85Vrms
5: Lock/Unlock lever. Automatically locks the
power supply to the FPS-S1U rack chassis
when the FPS1000 power supply is
inserted. Push the Lock/Unlock lever toward
the power supply cooling fan to withdraw
the FPS1000 from the rack.
6: IEC320 AC inlet
Fig. 3-2: FPS1000/P front panel
9
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