Solid State Relay Output Interface (FAC2100)
- Gary Cane
- Mark Krueger (Unlicensed)
Solid State Relay Output Interface
 
Solid State Relay Output
The FAC-2100 can be special ordered with an enhanced relay board that can include up to three DC or AC solid-state form A relays (see figure above.) Each solid-state relay is capable of switching 3 amp resistive or inductive loads at 60V DC or 140 V AC.
Each solid-state relay must be individually specified as AC or DC when ordered. You may not use the AC type to switch DC signals and visa-versa.
Do not use the solid-state modules to switch low currents as they typically have a 4-mA leakage current in the off state. Use a mechanical relay if it is necessary to switch low current.
Keep in mind that DC solid-state relays have defined polarities – the terminals labeled common (COMM) are positive and those labeled normally open (N/O) are negative.
Also, note that the AC solid-state modules are zero crossing turn-on. This means that the modules will not energize until the input waveform crosses zero volts. This translates to a maximum switching delay of approximately half the AC line frequency.
On FAC-2100 units equipped with miniature cylindrical connectors, some relay outputs may have additional current carrying limitations imposed by the connector pin. Refer to the Connector Pinout section for more information.Â