1. System Installation Requirements
1-13
TI 32P01J10-01EN
The system operating voltage range is shown below based on the relationship between eective
and peak values at the power input terminal of each system. Apply AC power within these ranges
to operate the system.
TIP
Average-value rectifying measuring instruments such as general type digital voltmeters and testers cannot
measure eective values accurately. Use Yokogawa’s digital oscilloscope DL series, power analyzer WT series or
equivalent device, which can measure eective values, peak values, and waveform distortion.
110
118 120
85
100
110
120
132
130 140 150 170
187
V
258 264
200
187
220
240
264
270 300
240 330 360
374
180
V op= 2 V rms
V op= 2 V rms
160
Peak value (V op)
value
(V rms)
Effective
value
(V rms)
Peak value (V op)
System operating
voltage range
System operating
voltage range
Figure System Operating Voltage Range
The DC stabilized power supply for the ProSafe-RS (except PCs) uses a compact and ecient
switching regulator circuit. In this circuit, output voltage cannot be maintained if the energy
(terminal potential) of the smoothing capacitor falls below a predetermined value. The circuit
monitors the capacitor terminal voltage and regards it as power failure if the voltage falls in the
danger zone, causing the system to enter power fail mode (non-detected momentary power
failure: up to 20 ms).
Current ows to the capacitor in this circuit when AC input voltage is higher than the capacitor
terminal voltage. Since the capacitor is charged by the peak value of the input waveform, it is
required that both the eective voltage value and the peak value conform to the specication
requirements.
Rectification, smoothing,
power factor correction
Input voltage
monitoring
DC/AC Rectification
Output voltage
monitoring
PWM
ACRDY
DCRDY
Input
(AC)
control
Output
(DC)
System
control
signal
(Waveform
monitoring)
Insulation
terminal voltage
Figure Power Circuit Diagram of Safety Control Unit
Nov. 27, 2015-00
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