Honeywell HC900 User And Installation Manual page 133

Relay Output Module Wiring
The Relay Output Module provides eight individually isolated, electromechanical relay outputs. Four of
the outputs are Form-C, and the other four are Form-A. A schematic showing the relationship of individual
Form-A relays and Form-C relays to external (user) connections is given in Figure 65. SIL applications
require an external series relay used to ensure outputs achieve failsafe action. See HC900 Process & Safety
Controller Safety Manual for additional details.
Examples of Relay Output wiring as they relate to connections on the Terminal Block are shown in Figure
66.
Figure 65 – Schematic Example: Relay Output and External Wiring
Contact Rating
Maximum current/output: 4A at 250Vac/30Vdc with resistive load
Maximum current per module: No de-rating per module, but ensure compliance with maximum ratings
for each output.
Note: specified relay life is 1,000,000 cycles. For applications requiring constant cycling of output,
Honeywell recommends using a solid state AC or DC output module.
Required Output Fusing
Outputs are not fused in the Relay module. Install a fuse for each output at the field device that is
appropriate for the load and the wire used.
Revision 6
21 April 2017
HC900 Process & Safety Controller User and Installation Manual 119