YOKOGAWA UT520 - Power Supply and Signal Isolation; Power Supply Details

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IM 05D01C02-41E 3rd Edition: May 31, 2006-00
Power Supply Specifications
• Power supply: Rated voltage of 100 to 240 V AC (10%), 50/60 Hz
• Power consumption: Max. 20 VA (8.0 W max.)
• Internal fuse rating: 250 V AC, 1.6A time-lug fuse
• Data backup: Non-volatile memory (can be written to up to 100,000 times)
• Withstanding voltage
- Between primary terminals* and secondary terminals**:
At least 1500 V AC for 1 minute
- Between primary terminals* and grounding terminal:
At least 1500 V AC for 1 minute
- Between grounding terminal and secondary terminals**:
At least 1500 V AC for 1 minute
- Between secondary terminals**:
At least 500 V AC for 1 minute
* Primary terminals indicate power terminals and relay output terminals
**Secondary terminals indicate analog I/O signal, voltage pulse output, and contact
input terminals
• Insulation resistance: 20 M or more at 500 V DC between power terminals and
grounding terminal
• Grounding: Class D grounding (grounding resistance of 100 or less)
Signal Isolations
• PV input terminals: Isolated from other input/output terminals. Not isolated from the
internal circuit.
• Remote input terminals: Isolated from other input/output terminals and the internal
circuit.
• 15 V DC loop power supply terminals: Not isolated from analog current output nor
voltage pulse control output. Isolated from other input/output terminals and internal
circuit.
• 24 V DC loop power supply terminals: Isolated from 4-20 mA analog output, other
input/output terminals and the internal circuit.
• Analog current output terminals (for control output and retransmission): Not isolated
between current outputs nor from 15 V DC loop power supply and voltage pulse
control output. Isolated from other input/output terminals and internal circuit.
• Voltage pulse control output terminals: Not isolated from current outputs and 15 V DC
loop power supply. Isolated from other input/output terminals and internal circuit.
• Relay contact control output terminals: Isolated between contact output terminals and
from other input/output terminals and internal circuit.
• Contact input terminals: Not isolated between contact input terminals and from com-
munication terminals. Isolated from other input/output terminals and internal circuit.
• Relay contact output terminals: Not isolated between relay contact outputs. Isolated
from other input/output terminals and internal circuit.
• Transistor contact output terminals: Not isolated between transistor contact outputs.
Isolated from other input/output terminals and internal circuit.
• RS-485 communication terminals: Not isolated from contact input terminals. Isolated
from other input/output terminals and internal circuit.