TATTLETALE® Annunciators and
Magnetic Switches
78793B Revised 4-08 Catalog Section 25
*
Description
TATTLETALE® annunciators and Magnetic Switches are the nerve centers that translate SWICHGAGE® contact operations into decisions and operate the alarm or shutdown device. They are the electrical load carrying devices for the alarm or shutdown device. TATTLETALE® annunciators indicate which monitored function failed leading to the alarm or shutdown whereas magnetic switches do not. Magnetic switches operate basically as a latching relay.
Application
Magnetic Switches and TATTLETALE® annunciators are available for use with engines or electric motors. Various circuits, time delays, and contact configurations are available to match the power source and mode of operation required for alarm only, alarm before shutdown or shutdown only.
For distributor ignition engines, the magnetic switch opens the distributor coil circuit to cause shutdown. For magneto or CD ignitions the magnetic switch grounds the ignition output. Some models can also trip fuel valves instead of or in addition to grounding the ignition. Diesel engines are shut down by either closing off the fuel or air supply. Magnetic switches and TATTLETALE® annunciators can make or break circuits for these engines.
For electric motor applications, various magnetic switches are available to operate the motor starter, holding coil directly or in conjunction with appropriate Murphy Transformer-Relay assembly.
■Nerve Centers for Murphy SWICHGAGE® Instruments and Automation Systems
Features
Magnetic switches and TATTLETALE® annunciators described in this bulletin are electrically tripped relay type devices. Models are available to operate from battery power, 120 VAC, conventional magnetos and capacitor discharge type ignitions. Energized to run models allow CLOSED LOOP circuitry. Others draw momentary power to trip. Configurations are available for contact make or contact break to cause shutdown. Some models have both make and break contacts.
All models have a weather resistant case with screw terminals for ease of customer hookup. Manually reset models have a face mounted reset push button which also serves as a fault indicator in the TATTLETALE® version. In this application, one or more TATTLETALE®/magnetic switches are used to advise operating personnel which monitored function caused shutdown. Only the TATTLETALE® connected to that function sensor trips causing the reset push button to pop out.
Electrically reset models perform the same functions as the manually reset models and are reset by cycling the power supply off and then on.
Time delay models use reliable solid state timing circuits to lockout operated switch contacts for start-up and/or to allow operation of alarms before shutdown occurs. Specific models allow application of power to a shutdown circuit and automatic disconnect of power after a given time delay.
See the chart on page 2 for features by part number.
*Applies to selected models.
78793B page 1 of 4
Specifications
Coil Voltage
12 volt
24 volt
12/24 volt*
120 VAC
Magneto ignition
CD ignition
Coil (see Note 6 below)
Contacts (see Note 2 below)
NCH
NOH
NCG
NOG
Latch Type
Energize to trip
Energize to latch
Reset Type
Manual indicating
Manual non-indicating
Electric non-indicating
Time Delay
Before shutdown
Start only
After shutdown
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117PH |
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2100 |
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2110 |
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2111 |
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2120 |
518APH518E 520APH521PH 760A |
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761APH8 |
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M4264 |
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R129A |
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117 |
M |
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ET |
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22PH |
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S |
30 |
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A A A |
B |
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B |
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*Multi-voltage AC or DC systems. See circuit descriptions below and on next page.
A:Dry contacts normally wired in hot circuit.
B:Dry contacts normally wired in ground circuit.
‡Does not latch after shutdown signal clears, automatically resets.
NOTES |
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The chart above indicates features/configurations available for each model. |
4. Reset Type-Refers to manual or electric reset; manual indicating type is a TAT- |
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1. Coil Voltage-Coils are specific voltage rated or multiple voltage rated. |
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TLETALE®. |
2. Contacts-This is the control circuit output. In the latched position the NCH con- |
5. |
Time Delay-Indicates operation of the time delay. |
tact has a “hot” output; in the tripped position the NOH contact has a “hot” out- |
6. |
Coil Resistances in OHMS, or coil and resistor |
put. In the latched position, the NCG has a “grounded” output; in the tripped |
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1.) 0.5 2.)18 3.)30 4.)72 5.)90/190 for 12/24 6.)288 7.)339/678 for 12/24 |
position, the NOG has a “grounded” output. |
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8.)339/618 for 12/24 |
3. Latch Type-Refers to whether the magnetic coil is momentarily energized to trip or requires continuous power in the operating mode and de-energizes to trip.
C |
S |
B |
117/117PH Use to shutdown 12V thru 32V distributor ignition or diesel engines. Breaks circuit when tripped. Opens distributor coil circuit or power circuit to diesel run device. Automatically disconnects from battery after trip. Contacts 10 amps 32 VDC. 14 amp fuse.
MS2100 Multi purpose TATTLETALE® |
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with dry contacts that can be used to make |
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two circuits and break another when tripped. |
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Operates from 120 VAC or Capacitor |
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Discharge Ignition. The operating coil is inter- |
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mittent duty and must be disconnected by an |
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external circuit when tripped. The MS2100 is a |
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replacement for 100PH, 307CD, 307PHCD and 224CD. |
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MS2110 Multi purpose TATTLETALE® |
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with dry contacts that can be used to make |
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two circuits and break another when tripped. |
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Operates from 12 or 24 VDC or 24 VAC. The |
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operating coil is intermittent duty and must |
be disconnected by an external circuit when |
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tripped. The MS2110 is a replacement for |
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221PH, 169PH, 274 and 274PH. |
MS2120 Multi purpose TATTLETALE® with dry contacts that can be used to make two circuits and break another when tripped. Operates from Magneto Ignition. The operating coil is intermittent duty and must be disconnected by an external circuit when tripped. The MS2120 is a replacement for 307, 307PH and 224.
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78793B page 2 of 4
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