QSC PowerLight Series Technical & Service Manual page 79

Gain = 1/37.5
_V200
3
+
1
2
-
5V=187V
_N_STEP
Values shown preclip a fixed
5 volts below the rails up to
15 amps of output current.
After that, preclip advances
120 mV per ampere output,
for 12v preclip at 70 amps.
6
-
7
5
+
CLIP
VP
PRE_LIM
-POL-
+15V_
5
+
-POL-
7
Gain = 1.67
6
-
7
-15V_
REREF
Limiter is shown in "fast clip-tracking"mode.
To convert to a slow attack/release limiter,
open the 3 places shown shorted with lines,
and make the connection shown by the
arrow line.
VN
Technical Service Manual
PowerLight 6.0 II, PowerLight 6.0 PFC , and PowerLight 9.0 PFC
I_MON
5
+
7
6
-
Positive = Clip
VP
2
-
1
3
+
VN
2
-
1
3
+
0.84 atten.
5.95Vpk
clips amp.
3
+
1
2
-
10 Vpk clips the amp
-POL-
with NO LOAD.
3
+
5 2
4
-
VP
VP
GAIN_RETARD
_BOP
MUTE
-POL-
5
+
7
6
-
With values shown, the effective
step switch time delay is 4us
flat out to 50 KHz.
CLAMP_SIG
LOSS_OF_FEEDBACK
CLIP_FEED
VP
DIFF_AMP_BIAS
650mV pk
excursion
P_ISENSE
N_ISENSE
3
+
1
2
-
+POL+
14
+
10 12 15
13
-
VP
Closed loop gain
=37.5 or 31.5 dB
5.0 Vp=187.5 Vp
VN
PowerLight 9.0
Signal Processing
_SPK_GND
_BOP
-POL-
_SPK
VN
PFC
77