CEquel Digital Systems Overview
Page 15 of 16
Shorted Output Protection (2000/4000 models only)
This is really an extension of the clip limiter. It is based on the number of clip events. If the clip
eliminator routine has counted 243 clip events and run the limiter all the way down to -24dB, it
continues to count clip events. If the clip count gets up to 5243 (approximately 500ms after full
attenuation), then a “SHORT” routine is entered. The channel is muted, the ready LED turned off
and a message is displayed on the LCD “SHORT 1”; 1 for ch1 or a 2 for ch2. If the amp is in
bridge mode, both channels should mute and the display message will be for ch1.
The amp channels are held in mute for one second. After that, they are unmuted, if the short
condition persists, they are muted again. The amp should be capable of enduring this condition
indefinitely. Because during a short condition, there is no output voltage, the tracker will keep the
rails at the minimum 30V, so amplifier is not in a highly stressful state.
Crowbar
The microcontroller has 3 different conditions that can cause it to fire the crowbar and shut down
the amplifier. Firing the crowbar is considered a fatal event and the amp must be power cycled to
recover from it.
1. Overtemp: If any temp sensor reads ≥ 110˚C.
2. DCLF: If the DCLF signal goes low for ≥ 90ms.
3. If the AC sense line (RAIL signal) is ≥ 3.0V (approx. 300VAC on AC line)
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