Manual 35018V1 505XT Digital Control System for Steam Turbines
Woodward 42
Figure 2-8. Analog Input – Loop-Powered Block Diagram
Hardware - Analog Outputs (4-20 mA)
This control provides an isolated group of (6) 4-20 mA outputs for customer use. Each output can drive up
to 600 ohm loads and provides fault monitoring of individual source and return currents.
Features
(6) Analog Output channels (4-20 mA)
Source and return current monitors
Group isolated from other circuits
Capable of driving higher impedance loads up to 600 ohms
Woodward GAP block, diagnostics, and configuration support
GAP configurable update rates of 5 ms to 160 ms
Table 2-9. Specifications (AO)
Number of channels 6 (each with readback)
AO Output Range 0 to 24 mA, 0 mA during shutdown
AO Output Isolation
0 V channel to channel
500 Vrms to EARTH and all other I/O
AO Accuracy (@ 25 °C) ≤ 0.024 mA (0.1% of FS=24 mA)
AO Accuracy (–40, +70 °C) ≤ 0.120 mA (0.5% of FS=24 mA)
AO Resolution ~14 bits of full scale
AO Hardware filter (max) 3 poles @ 250 μs
AO Load Capability 600 Ω at 20 mA
AO Output Readbacks (0 to 24) mA, source and return
AO Readback Accuracy < 1% at 25°C, < 3% over full temperature range
AO Readback HW Filter ~0.5 ms nominal
IOLOCK state
AO circuits are driven to 0 mA during power-up,
power-down, core voltage failures, and watchdog
failures
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