Crown AMB-5 - Manual (Page 19)

Page 19
IQ Mixer / Multiplexer Hardware Installation
Rev. 0
Fig. 3.22 A 12x8 Mixer Using 8 Mixer/Multiplexers
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:
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
10 V
1
3
2
AUXILIARY
EQUIPMENT
110 VAC
SOLID
STATE
RELAY
(C 7308-7)
+ –
INPUT
Fig. 3.23 Sample Auxiliary System Wiring
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.
OUT
AUX
CONNECTOR
GND
1 3
1.5 K ohm
+24 V
IN
(LSTTL)
+5 V
20 K
100 K
2
10 V Zener
Fig. 3.24 Internal Auxiliary Circuit
SMX-6 SMX-6
MPX-6 MPX-6
MPX-6
MPX-6
MPX-6
MPX-6
MAIN
OUT
STACK
IN
PARALLELED
INPUTS
6x8
12 INPUTS
8
OUTPUTS
STACKED
OUTPUTS
6x8
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
® TA3F cable connector or
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