6.6 TRLYS1D Relay Output with Solenoid Integrity
Sensing
The Relay Output with Solenoid Integrity Sensing (TRLYS1D) terminal board holds six plug-in magnetic relays. The six
relay circuits are Form-C contact outputs, powered and fused to drive external solenoids. A standard 24 V dc or 125 V dc
source can be used. The board provides special feedback on each relay circuit to detect a bad external solenoid. Sensing is
applied between the NO output terminal and the SOL output terminal.
TRLYS1D is similar to the standard TRLYS1B board except for the following:
• There are six relays.
• The board is designed for 24/125 V dc applications only.
• Relay circuits have a NO contact in the return side as well as the source side.
• The relays cannot be configured for dry contact use.
• Input relay coil monitoring is removed.
• The terminal board provides monitoring of field solenoid integrity.
• There is no special-use relay for driving an ignition transformer.
TRLYS1D Block Diagram
150 GEH-6855_Vol_II GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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