DLS-003 through DLS-008 Installation and Operation Instructions
The Digital Lullaby System (DLS) installation requires an activation method, an available 120VAC outlet, and an input to your overhead paging system. Normally, you
will be installing the DLS module at your paging amplifiers area, and it will be activated remotely. The DLS is compatible with every overhead paging system.
Compatibility is provided by the method of installation, not by the paging equipment. If a page can be made, the DLS can be installed. Please contact Cotronix for
technical assistance as needed.
Step 1: Activation
Activation is accomplished through any momentary dry contact closure. The activation input port on the DLS module is labeled "Act". The two standard methods of
supplying this closure are with either a push button wall switch, or a relay output from your PBX (telephone) system. Both methods may be used individually or
simultaneously as long as the closures are dry. This means the closure must come from switch or relay contacts, and not from transistor outputs. The simplest
method of activation is a normally open momentary pushbutton wall switch, which is already isolated and dry, and requires no further processing. It is acceptable to
utilize an existing telephone pair to route the closure to the Lullaby module's "Act" jack. However, the actual closure contacts must be within 1200 cable feet of the
lullaby module, AND the run must not exceed 30 ohms. If this is not possible, either move the module toward the closure, or install a relay at the paging amplifier area
and momentarily activate this relay with the distant closure. This relay should also be installed if you are unsure if your closure is dry, especially if you are actuating
the DLS with your PBX. This relay would then in turn momentarily activate the Lullaby module's activation input. Keep the module at the paging amplifier area if
possible. Install it closer to the closure only when necessary.
Regardless of where the actual contact closure is located that the lullaby activation port sees, from 1 to 1200 feet away, the supplied 10uF capacitor MUST be
connected across this closure at its source. You must observe polarity. First install the system without the capacitor, and then measure the voltage across the
closure with a digital VOM so you know which way to install the cap. If you are using two buttons in series, such as an activate button on the wall and an enable
button at the nurse station, you must install the capacitor at the neck of the wye, where the two cables meet before it homeruns. The "Act" input must see this cap at
all times. Don't leave the system powered up for more than an hour or two without the cap installed. The input is very sensitive. Damage from an input surge is not
covered under the DLS warranty. If you are getting false triggering or double plays, your high impedance activation port is most likely seeing inductance noise from
adjacent cable pairs. In this case, your activation homerun must be changed to a dedicated shielded pair to eliminate possible module damage. If pulled through
grounded EMT, the cable does not need to be shielded.
Step 2: Power
Plug the included power supply into a surge protected 120VAC power strip, and the other end into the DLS jack labeled "Pwr". Damage from a power surge is not
covered under the DLS warranty. If power is interrupted between activations, the Lullaby will be retained in the DLS EPROM. If power is interrupted while the Lullaby
is playing, the DLS will resume play if power is restored within 10 seconds. The DLS will be reset if power is interrupted for more than 10 seconds, and will play the
Lullaby in its entirety with the next activation.
Step 3: Output
The DLS output is a single channel, 1V p-p floating signal, balanced into 600 ohms. It is labeled "Opt". A cable has been provided for your convenience. This cable
may be cut to the desired length. Every splice or connection should be protected within an enclosure. This output signal can be connected directly to any amplifier
input requiring signal levels from mic level to aux level. No additional isolation is needed nor advised. A Background Music (BGM) input is ideal. If you find the
amplifier to be overdriven (input control too sensitive and must be set very low, or distorted audio), simply pad down the DLS signal with one 1Kohm resistor on each
of the two DLS output legs. For even further padding, if necessary, place another 1Kohm resistor across the amplifier's input, downstream of the first two resistors.
Keep in mind when considering which amplifier input the DLS should utilize, that it may be critical to maintain the highest priority input on your amplifiers for paging,
so a page will always override the DLS or BGM.
Approximately 60% of all paging amplifiers in hospitals have an available input for the DLS. We have listed below the possible scenarios for the other 40%. Please
contact Cotronix as needed.
Unique Output Connections
If your facility utilizes Background Music (BGM) and you have no additional inputs on your amplifiers, and there are only 2 paging conductors from your PBX or
microphone(s) (audio only), you can install a DPDT Time Delay Relay, available at any electrical supply store. In this case, the Lullaby shares the BGM amplifier input.
The momentary pushbutton switch that normally actuates the Lullaby would instead actuate the TDR. In turn, one pole of the TDR would temporarily open the BGM,
and the other pole would temporarily close the Lullaby. Be sure to set the TDR duration for slightly more time than the Lullaby's duration.
If your facility utilizes BGM and you have no additional inputs on your amplifiers, and there are 4 paging conductors from your PBX or microphone(s) (audio + closure),
you can install a standard DPDT relay, triggered by the paging closure. The Lullaby would be applied to the paging input through the normally closed relay contacts. A
page would actuate the relay, opening the Lullaby audio, and simultaneously applying the page audio to the amplifier(s).
If your facility DOES NOT utilize BGM and you have no additional inputs on your amplifiers, it is possible to share the input with paging. This is the simplest installation
method in this situation, but it does not allow for paging priority. Instead, it will cause potential simultaneous audio through the channel. This method involves
installing a resistor in each of the Lullaby's 2 output legs. The resistors are necessary because a direct connection of the Lullaby output across the paging input will
usually mute the pages extensively. These resistor values should match each other, and should be selected to allow the Lullaby's audio level to be in correct
proportion to the paging audio level. Again, this method allows paging at all times, but does not allow paging to completely override the Lullaby. This would not be a
problem for facilities that utilize the same staff for paging and DLS activation.
If your facility DOES NOT utilize BGM and you have no additional non-priority inputs on your amplifiers, and it is imperative that paging overrides the Lullaby, and you do
not intend to replace your amplifiers with the priority capable type, you can install a VOX module, such as the Bogen VAR-1, available from your local sound system
dealer. This module listens for pages, and gives a dry DPDT output whenever a page is made, which can be used to momentarily open the Lullaby audio during the
The DLS is best installed close to your facility's paging amplifiers. However, if necessary it may be installed anywhere between the activation point and the amps.
Installing the system at the amplifier end of the activation run will ensure minimal audio noise inductance. Installing the DLS at the activation end, only when
necessary, can minimize false triggering and blown inputs.
The DLS includes a very low-level internal monitor for aiding in installation, testing, and troubleshooting. Upon activation, the Lullaby's audio will be sent to the "Opt"
jack on the DLS module, as well as to this internal monitor. You must typically place your ear directly on the module to hear it.
The 1/8" Output and Activation connectors on the DLS module appear to be identical. However, they are not interchangeable. Simply be careful to observe the label
on the DLS module. An accidental reversal of these two will usually not cause harm to the DLS, but it will not operate properly unless correctly connected. The output
and activation cables are identical, and thus may be interchanged.
Please note your DLS warranty. Each party maintains certain responsibilities. There are no user serviceable components inside the DLS. An open case will void the
warranty or the trial period. If anything goes wrong with your system, or for technical assistance, please contact us by calling, writing, faxing, or emailing.
Operation involves simple momentary activation.