Connecting Auxiliary Devices (Step 4); A 12X8 Mixer Using 8 Mixer/Multiplexers; Sample Auxiliary System Wiring; Internal Auxiliary Circuit - Crown AMB-5 Hardware Installation Manual

IQ Mixer / Multiplexer Hardware Installation
By using several units and a combination of parallel
inputs and stacked outputs, larger mixing configu-
rations (12x8, 24x4, etc.) can be created as shown
below:
12 INPUTS
MAIN
OUT
SMX-6
PARALLELED
INPUTS
MPX-6
MPX-6
MPX-6
STACKED
6x8
OUTPUTS
Fig. 3.22 A 12x8 Mixer Using 8 Mixer/Multiplexers

3.4 Connecting Auxiliary Devices (Step 4)

Auxiliary devices, external to the IQ System , can be
turned on and off using the Aux port on the mixer/
multiplexer. For example, auxiliary cooling for an
amplifier equipment rack can be controlled using
the Aux port to control a solid state relay which in
turn controls a cooling fan. This is shown below in
Figure 3.23:
AUX
CONNECTOR
GND
1
10 V
3
INPUT
2
110 VAC
Fig. 3.23 Sample Auxiliary System Wiring
The solid state relay shown (Crown part number C
7308-7) can be ordered from Crown.
The Aux port uses a male 3-pin mini XLR connector
which is located above the DB25 connector (Figure
2.1). Use a Switchcraft
equivalent to make the connection.
When the Aux port is turned on by the IQ System it
provides 10 VDC across pins 3 (+) and 1 (ground).
An internal 1500 ohm resistor limits the current to a
Rev. 0
STACK
IN
SMX-6
MPX-6
8
OUTPUTS
MPX-6
MPX-6
6x8
SOLID
STATE
RELAY
+ –
(C 7308-7)
AUXILIARY
EQUIPMENT
® TA3F cable connector or
maximum of 16 mA. This is shown below in Figure
3.24.
Notice in Figure 3.24 that the Aux port also has the
capability to receive a signal across pins 2 (+) and
1 (ground). It is a high impedance input and in-
cludes a pull-down resistor.
+24 V
1.5 K ohm
+5 V
(LSTTL)
100 K
Fig. 3.24 Internal Auxiliary Circuit
10 V Zener
AUX
CONNECTOR
3 1
OUT GND
2
IN
20 K
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