8
Powering Multiple AD1200EXP Units
Connecting multiple (maximum of 4) AD1200EXP units to
one AD1200A Controller requires the use of an external
120VAC to 24VAC step-down transformer.
NOTE: Connecting multiple AD1200EXPs for European
operation requires the use of a 230VAC to 24VAC
step-down transformer.
The first AD1200EXP draws 24VAC power directly from the
AD1200A Controller (see Figure 7).
The remaining three AD1200EXP units require an external
step-down transformer. These three units are wired in parallel
from the single step-down transformer (see Figure 7).
NOTES: A 120VAC step-down transformer may be ordered
directly from American Dynamics (part# AD124)
or purchased separately. Step-down transformer
requirements for North American operation are
120VAC-to-24VAC, with a minimum output of 30
VA, class 2, if powered from other than an
AD1200A.
A 230VAC step-down transformer may be ordered
directly from American Dynamics (part# ADE125)
or purchased separately. Step-down transformer
requirements for European operation are 230VAC-
to-24VAC, with a minimum output of 30 VA.
For the FIRST AD1200EXP Unit in a Series:
1. Connect the 14-pin connector of the FIRST (Unit #1)
AD1200EXP in a series to the 14-pin mating connector on
the rear panel of the AD1200A Controller (see Figure 7).
NOTES: Refer to Table 1, page 4, and Figure 4, page 5, for a
diagram of the AD1200EXP 14-pin connecter.
The first AD1200EXP unit in a series draws power
directly from the AD1200A Controller. All
remaining AD1200EXP units in the series draws
power from a separate transformer.
The 24VAC POWER lead from the FIRST
AD1200EXP in the series connects through the 14-
pin connector to the AD1200A Hard-wired
Controller.
The 24VAC COMMON lead from the FIRST
AD1200EXP in the series connects through the 14-
pin connector to the AD1200A Hard-wired
Controller.
For the SECOND, THIRD, and FOURTH AD1200EXP
Units in a Series:
2. Disconnect the 24VAC POWER lead (Wht/Blk) from pin
7 of EACH of the AD1200EXP 14-pin connectors.
3. Connect the 24VAC POWER lead of each of the
AD1200EXP units in the series to one of the output
screws of the step-down transformer (see Figure 7).
4. Disconnect the 24VAC COMMON lead (Red/Blk) from
pin 8 of EACH of the AD1200EXP 14-pin connectors.
5. Connect the 24VAC COMMON lead of each of the
AD1200EXP units in the series to the other output screw
of the step-down transformer (see Figure 7).
INSTALLATION AD1200EXP
24VAC POWER
24VAC COMMON
AD1200A Controller
AD1200A Controller
AD124 Transformer
AD124 Transformer
AD124 Transformer
AD124 Transformer
AD124 Transformer
AD124 Transformer
Table 2 - Multiple AD1200EXP Unit Power Sources
AD1200EXP Unit #1 AD1200EXP Unit #2 AD1200EXP Unit #3
AD1200EXP Unit #4
CAUTION
Disconnect all AD1200EXP and AD1200A
Controller units from their respective power
sources before proceeding with any connections!
Severe damage to the internal electronics as well
as personal injury may result!