Manual 35018V1
505XT Digital Control System for Steam Turbines
Woodward
43
Figure 2-9. Analog Output Block Diagram
Hardware - Actuator Outputs
This control provides an isolated group of two (2) Actuator outputs for customer use. Each driver can be
configured for low-range (20 mA) or high-range (200 mA) operation. Fault monitoring of individual source
and return currents is included.
Features
Two (2) Actuator Output channels (4-20 mA, 20-200 mA)
Source and return current monitoring
Group isolated from other circuits
Capable of driving higher impedance loads
Woodward GAP block, diagnostics, and configuration support
GAP configurable update rates of 5 ms to 160 ms
Table 2-10. Specifications (ACT)
Number of channels
(2) proportional drivers with source & return readbacks
ACT Output Range
Configurable for 24 mA or 200 mA range
ACT Output Range (low)
0-24 mA, 0 mA during shutdown (FS = 24 mA)
ACT Output Range (high)
0-200 mA, 0 mA during shutdown (FS = 210 mA)
ACT Output Isolation
0 V channel to channel
500 Vrms to EARTH and all other I/O
ACT Accuracy (25 °C)
Low Range
≤
0.024 mA
(0.1%)
High Range
≤
0.21 mA
(0.1%)
ACT Accuracy (–40, +70 °C)
Low Range
≤
0.120 mA
(0.5%)
High Range
≤
1.00 mA
(0.5%)
ACT Resolution
~14 bits of full scale
ACT Hardware filter (max)
3 poles @ 500
μ
s
ACT Load Capability (low)
600
Ω
at 20 mA
ACT Load Capability (high)
65
Ω
at 200 mA
ACT Output Readbacks
(0 to 24) mA, source and return
ACT Readback Accuracy
< 1% at 25°C, < 3% over full temperature range, (source & return)
ACT Readback HW Filter
~0.5 ms nominal
ESTOP action
Front panel ESTOP button will shutdown the actuator circuit,
remove actuator power, and set an alarm in GAP software.
IOLOCK action
During IOLOCK, ACT power is shutdown and ACT circuits are
driven to 0 mA during power-up, power-down, core voltage
failures, and watchdog failures.