1. System Installation Requirements
1-14
TI 33Q01J10-01E
1.3
Power Supply System
For stable operation, a high quality power supply is required. The following conditions
should be met:
• Voltage and frequency fluctuations are within the limits specified for each system
component.
• Waveform distortion is within limits.
• High-frequency noise is not at a level that affects system operation.
• Use an UPS (uninterruptible power supply) if necessary.
AC Power Specification
AC power used for the system must be within ±10 % of specified rated voltage and the peak
value must be greater than the minimum specified (see below). DC power must be within ±10 %
of specified 24 V DC at the power supply terminals.
IMPORTANT
If the power unit has high output impedance or high wiring impedance, the resulting voltage drop
flattens the input voltage wave, forming a distorted waveform with a low peak value (“B” in the
chart below).
Even if the effective value of the distorted input voltage wave is the same as that specified for a
non-distorted input voltage wave, the voltage across the terminals of the smoothing capacitor
in the power circuit may be so low that the system detects power failure. If input voltage waves
A and B shown below, have the same effective value of 100 V AC, wave B will have a lower
smoothing capacitor terminal voltage.
Peak A
Peak B
F010301.ai
A: Ideal, non-distorted input voltage wave
B: Distorted input voltage wave
Figure Distorted Input Voltage Waveform
Nov. 20, 2003-00
