LVDD Controls
The LVDD, or Low Voltage Dispenser Disconnect, is a series device that breaks low-voltage circuitry such as intercom, POS, CAT5/CAT6, and related communication paths.
The LVDD gets its power from the DMEX module, providing a single-point disconnecting means for the individual MPD.
Compliance: Ensure your facility stays compliant and meets NEC 514 (13) provisions for maintenance and service of dispensing equipment.
- 1 LVDD module per dispenser
- 1 LVDD motherboard supports up to 4 LVDD modules
- Start here for card reader, video, data, and communication issues
Actual LVDD module
The LVDD is the low-voltage side of the dispenser pair and should be the first troubleshooting point for communication-related service calls.
Typical LVDD electrical scheme
This diagram illustrates the LVDD inside the electrical panel with low-voltage circuits routed through it while 120V dispenser power is supplied separately.
LVDD wiring diagram
Use this wiring view when tracing dispenser data, card reader, auxiliary, ethernet, and low-voltage disconnect paths.
LVDD board callouts
Quick visual identification of common input, output, relay, and connector areas on the LVDD module.
LVDD quick checks
- Confirm the correct dispenser number first
- Identify the LVDD motherboard group (4 modules per motherboard)
- Check input / output low-voltage routing
- Inspect communication paths for card reader, video, and POS
- Check module-to-motherboard connection integrity