
FREQUENTLY ASKED TECHNICAL QUESTIONS
NUMBER
QUESTION ANSWER
20 "I am synchronizing using a Wheelock
Synchronization module (SM-12/24 and/or DSM-
12/24) and using Series AS, NS and RSS
appliances. My strobes and audibles are not
synchronizing."
There are 3 main reasons for loss of synchronization.
Voltage drops below the appliance's listed voltage, pulsed
voltages from the power source or the appliances are not
capable of synchronization.
To check for voltage drop perform the following test.
1. Put temporary jumper wires between +in1 & + out1 and
+in2 & +out2. Please note that this disables the sync
protocol. When finished with the test the temporary
jumpers must be removed.
2. Activate the circuit and go to the last appliance on the
circuit and take a voltage reading. This should also be the
location of the end of line resistor.
3. For appliances manufactured after January of 2001 the
allowable voltage drop is 16 VDC.
4. Either the quantity of appliances on that circuit need to
be reduced or a power extender such as Wheelock's
PS-12/24-8 should be used at a midway point that has a
voltage greater than 16 VDC.
To check for pulsed voltages from the power
source.
1. Measure the voltage between +in1 & minus1 and +in2
& minus2.
2. The voltage should be constant with no fluctuation.
3. Change panel program to a constant/steady output.
Temporal/code 3 and march time should never be used.
4. An additional test can be performed to validate the
power source. Remove the circuit from the power source
and test the circuit directly on the batteries. If it works
correctly on the batteries then contact your panel
manufacturer on how to program a constant/steady output.
To check if your appliances are capable of
s
nchronization.
1. Reference the instruction sheets that came with your
appliances. If they do no mention synchronization as a
feature then they cannot be synchronized. In addition you
can contact Wheelock Technical Support @
800-631-2148, option 3 for assistance determining the
appliances features.
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