Manual 35018V1 505XT Digital Control System for Steam Turbines
Woodward 45
Hardware - Relay Outputs
This control provides (8) Isolated, Form-C Relay outputs with NO, COM, NC contacts available at the
terminal block.
Features
• (8) Relay Output Channels
• Each Relay Output provides NO, COM, and NC contacts
• Each Relay Output channel provides a coil voltage readback fault
• Woodward GAP block, diagnostics, and configuration support
• Contact isolation maintained at terminal blocks
• ATEX approved version available using hermetically sealed relays
• GAP configurable update rates of 5 ms to 160 ms
Table 2-12. Specifications (Relay Outputs)
Number of channels (8) relays
Contact Type Form-C with NO, COM, and NC terminals
STD Relay, contacts (DC) 5 A, 5-30 Vdc (resistive)
STD Relay, contacts (AC) 2 A, 115 Vac (resistive)
STD Relay, operate time < 15 ms typical
RELAY Coil Readback Coil voltage readback status is available
RELAY Coil Rdbk Filter 1 ms approx at room temp
RELAY Output Isolation 500 Vrms minimum to EARTH and all other I/O
RELAY Contact Isolation 500 Vrms minimum between open contacts
RELAY to RELAY Isolation 500 Vrms minimum between relays
IOLOCK State
Relay outputs are de-energized during power-up, power-
down, core voltage failures and watchdog failures
ATEX version: The ATEX approved control uses a Hermetically sealed relay
ATX Relay, contacts (DC) 5 A, 5-30 Vdc (resistive), 0.2-0.5 A (inductive)
ATX Relay, contacts (AC)** 2 A, 115 Vac (resistive), 0.1-0.2 A (inductive)
Explosion
Hazard
**ATEX/IECEx Compliance requires relay contact loads be
limited to < 32 Vac rms / < 32 Vdc.
Figure 2-12. Relay Output Block Diagram