Specifications
Voltage range: DC or full-wave-
rectified; 11 to 30 volts. NOTE:
Supply voltage range at 12 volts, 11
to 17 VDC; at 24 volts, 21 to 30 VDC.
MDL, MDLW Sync Modules
®
for SpectrAlert Series
Maximum load on loop: 3 amps.
Current: See table below.
Description
The Sync•CircuitTM module
synchronizes SpectrAlert®
strobes at 1 Hz and horns
at temporal 3 over a single
pair of wires. Patented mod-
ule technology also allows
the silencing of horns on
horn/strobe models over a
single pair of wires.
DC FWR DC FWR DC FWR
12
24
10 12 30 31 87 122
11 15 35 37 198 262
Operating temperature: 0°C to
49°C (32°F to 120°F).
Application Flexibility.
The Sync•CircuitTM module
is designed to power and
synchronize either two 3-
amp circuits wired in Class
B or one 3-amp circuit pow-
ered as Class A. Should
more than two zones require
synchronization, additional
modules can be added by
Listings
Listings and approvals below apply to
the MDL(W) Sync Modules for
SpectrAlert® Series. In some cases,
certain modules may not be listed by
certain approval agencies, or listing
may be in process. Consult factory for
latest listing status.
interconnecting the “slave”
input and output terminals
between modules.
The MDL Module
Additional Capabilities. The Sync•CircuitTM module is also designed to gener-
ate temporal 3 tone for System Sensor’s Multi-AlertTM and PA400 Mini-AlertTM
sounders. Existing installations can be upgraded to comply with NFPA 72.
•
•
•
•
•
UL Listed: files S5512, S4011.
ULC Listed: files CS548, CS549.
MEA approved: file 257-97-M.
FM approved.
Module Configuration
Each MDL module has the capability of connecting two Style Y (Class B) cir-
cuits or one Style Z (Class A) circuit.
CSFM approved:
file 7300-1209:179.
The NAC output(s) from the panel are connected to the zone inputs of the MDL
module and the zone output(s) from the MDL module are connected to the noti-
fication loop(s). Supervision is accomplished in the module by a direct connec-
tion between the zone input and the zone output of each of the two zone circuits
connected to the normal end-of-line device. The FACP “sees” the EOL device
through the MDL module. When either or both outputs (zones 1 & 2) from the
module are wired to the SpectrAlert products, the horns and strobes in both
zones will be synchronized.
Product Line Information
MDL
Sync module for use with
SpectrAlert Series, red.
MDLA
Sync module for use with
SpectrAlert Series, red,
for Canada.
MDLW
Same as above, white.
The MDL module can be configured so that more than two zones can be syn-
chronized by the interconnection of the slave input and output (see Application
Examples).
MDLWA Same as above, white,
for Canada.
Special Considerations
NOTE: The MDL Module is factory-set with the trouble contacts in the open
state. These contacts may close during shipping. Approximately two sec-
onds after power-up, these contacts will open.
MDL and MDLW Sync Modules CS-2456 10/21/04
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