Relay Module – 2 DCR (Dry-contact relays)
The optional Relay Module adds two programmable dry-contact relays. The open collector output in the 9900 base unit uses the Relay 1 setting. The optional Relay Module is assigned to relays 2 and 3 in the menus.
- Dry-contact relays are electromechanical switches with a moving contact armature. They are suitable for many general purpose applications, AC or DC, including loads up to 250 V. Install RC Filter kits (3-8050.394) on relays used to switch motor or inductive loads. This module adds two programmable dry-contact relays to the standard Open Collector output on the base unit.