Capable to switch 20 amps of 120-volt AC power
![FSR-SPC-20X]()
The SPC-20X is the expansion unit to the SPC-20 and provides sequential switching of one load (amplifiers, etc.). It is controlled by the SPC-20. An unlimited number of SPC-20X’s can be used in an installation. The SPC-20X can switch 20 amps of 120-volt AC power.
To initiate a power-up sequence, push the system power button. The system LED will start to blink to confirm system turn on and indicate that circuit 1 has been activated. The time between each circuit power-up is set by the initial delay adjust. When the final circuit is powered, the system LED will stay on and the power-up is complete.
Initiating a power-down sequence
To initiate a power-down sequence, push the system power switch again. The system LED will start to blink to confirm a power-down. At this time, the external circuits will begin to power down starting with the furthest stage. All delays are the same as the power-up. A trip input from the fire alarm or other emergency signal will override all other inputs and cause the system to sequence down. The trip LED will illuminate in response to a trip. In order to extinguish the trip lamp, the trip input must be cleared, and then the momentary system power switch must be pressed.
Mounting SPC-20X
Mount the SPC-20X in the desired location away from high heat. Do not obstruct heat sink fins. Connect expand-in connector to expand-out connector of previous SPC-20X. Note: Be careful to observe PIN 1 tO PIN 1 etc. on all expansion signal cables. The expand out connector of the last SPC-20X is left unconnected.
Connect the desired equipment into rear panel outlets. The outlets may be connected to plug strips if multiple loads per circuit are desired. The installation is complete.
Power up system from the SPC-20 system on/off button or any remote panel. The time delays between circuit 1 and 2 and successive circuits startup are controlled by the pot on the SPC-20 rear panel. The system fault indicator will light anytime AC power is lost to an enabled load, o if a disabled load continues to receive AC power. A local fault occurrence will also trip the system fault lamp on the SPC-20 unit.