Murphy Switch M 6797B User Manual

®
M-6797B  
Revised 10-06  
TATTLETALE Annunciators and  
Catalog Section 25  
Magnetic Switches  
Nerve Centers  
for Murphy  
®
SWICHGAGE  
Instruments and  
Automation  
Systems  
*
Description  
Features  
®
®
TATTLETALE annunciators and Magnetic Switches are Magnetic switches and TATTLETALE annunciators  
®
the nerve centers that translate SWICHGAGE contact described in this bulletin are electrically tripped relay type  
operations into decisions and operate the alarm or devices. Models are available to operate from battery  
shutdown device. They are the electrical load carrying power, 120 VAC, conventional magnetos and capacitor  
®
devices for the alarm or shutdown device. TATTLETALE  
discharge type ignitions. Energized to run models allow  
annunciators indicate which monitored function failed CLOSED LOOP circuitry. Others draw momentary power to  
leading to the alarm or shutdown whereas magnetic trip. Configurations are available for contact make or  
switches do not. Magnetic switches operate basically as a contact break to cause shutdown. Some models have both  
latching relay.  
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  
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.  
®
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.  
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.  
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.  
M-6797B page 1 of 4  
 
760A/760AF/761APH Use for distribu-  
®
tor ignition or diesel. Time delay lockout of  
518PH Aallows for SWICHGAGE and/or  
®
TD  
SWICHGAGE contacts on start-up only; cus-  
N.C. contacts to be wired Closed Loop” (in  
series). Any contact open or SWICHGAGE  
contact close in the circuit shunt trips the  
518PH. Specify 12 or 24 VDC. Contacts 10  
amps 24V. 14 amp fuse.  
®
tomer wired for delayed or immediate trip on  
shutdown. Breaks and makes circuits when  
tripped. 760A resets automatically when the  
shutdown signal is removed or power is  
removed. 761APH has manual reset. 760AF is  
R
G
NO  
NC  
S
B
G
NC  
SW1  
SW2  
B
760A with inline fuse. Must specify 12 or 24 VDC, and length  
of time delay. Optional time delays: 15, 30 (standard) or 60  
seconds. Contacts 10 amps 24 V. 14 amp fuse. Models 760A  
and 761APH carry the CE mark.  
*
®
518APH Allows for SWICHGAGE and/or  
N.C. contacts to be wired Closed Loop” (in  
series). Any contact open or SWICHGAGE  
®
contact close in the circuit shunt trips the  
518APH. Specify 12 or 24 VDC. Contacts 10  
amps 24V. 14 amp fuse.  
822PH Used in Murphy TR-assemblies as  
master disconnect. 24 VAC coil energizes  
when SWICHGAGE® contact closes to  
ground; breaks and makes circuit when  
tripped. Manual reset.  
R
G
NO  
NC  
SW1  
SW2  
B
518E Same as 518APH but recommended  
for high vibration application where nuisance  
shutdowns typically occur due to higher than  
normal vibrations (ie. wood chippers) 12 Volt  
only.  
NO  
NC  
C
SW  
M4264 Series Detects loss of  
520APH Same as 518APH except with 30  
magneto/CD ignition output and transfers con-  
tacts for customer use. Contacts 10 amps; 48  
VAC/VDC.  
second time delay before trip on one SWICH-  
®
GAGE contact input but immediate trip on the  
®
TD  
second SWICHGAGE contact input. Typical  
Sensing  
Circuit  
M42641CD transfers SPDT dry contacts when  
tripped.  
use is for immediate stop of engine from oil  
pressure or coolant temperature, but delayed  
shutdown from alignment switches on center  
pivot irrigation system. Specify 12 or 24 VDC  
and length of time delay. Time delays are  
available from 5 to 120 seconds. Contacts 10 amps  
24 V. 14 amp fuse.  
R
G
NO  
NC  
SW1  
SW2  
B
IGN  
IGN  
BY  
NO NC  
C
*
R129A A SPDT relay with 10 amp dry  
contacts. Specify 12 or 24 VDC. Contacts 10  
amps 24 VDC. 14 amp fuse.  
®
521PH Use with N.C. SWICHGAGE or  
switches to ground magneto or CD ignition  
when tripped. Trip coil energized to run, de-  
energized to shutdown when N.C.  
G
NO  
NC  
S
B
contacts open. Specify 12 or 24  
VDC. Contacts 10 amps 24 V.  
*
G
NC  
SW  
C
ETS30S All solid-state time delay for energized to stop circuits such as  
solenoids. When a shutdown signal is received, the ETS30S applies power to  
the shutdown device for 30 seconds and then disconnects the power. Input  
power 12 or 24 VDC.  
MS2111 Replaces 221PH w/72 ohm coil.  
Used with NICS-78 non-incendive control  
system. Service part only.  
6 1  
2
3
4 5  
* Complies with EMC Council directive 89/336/EEC regarding electromagnetic compatibility.  
M-6797B page 3 of 4  
 
How to Order  
Specify model number and options using the diagram below. List options in alphabetical order (A to Z) followed  
by numeric in ascending order. Place a dash (–) between each option.  
760AF – 15 – 12 –  
M42641CD  
Base Models  
117  
Options  
*
Not all options may not be available on all  
*
R129A  
117PH  
518PH  
518APH  
models in combination with other options. See  
Configurations Available” chart below.  
AS = Auxiliary SPDT switch  
ETS30S  
MS2100  
MS2111  
MS2110  
MS2120  
**  
518E  
520APH  
521PH  
ES = Environmentally sealed  
EL = Explosion-proof less case  
*
760A  
*
761APH  
822PH  
M42641M  
Voltage/Ground (where applicable)  
12 = 12 VDC  
24 = 24 VDC  
Time Delay (where applicable)  
15 = 15 seconds  
30 = 30 seconds  
60 = 60 seconds  
Specify other.  
*
Add the letter Fto the base model to indicate an inline fuse instead of a base mounted fuse. Example: 760AF, 761APHF, 117F.  
**  
12 Volt negative ground version only.  
Configurations Available  
Accessories  
Order accessories as a separate item. Specify part  
number when ordering.  
25050016 Weathercap.  
25050547 Clear flexible dust boot for push button.  
30050323 Single unit mounting panel.  
65010026 In-line fuse holder with 14 amp fuse.  
Non-PH  
PH  
PH-ES  
1= Offered  
2= Auxiliary snap-switch  
Warranty  
A limited warranty on materials and workmanship is given with this FW Murphy product.  
FW M URP HY  
P.O. Box 470248  
COM P UTRONIC CONTROLS , LTD  
41 - 43 Railway Terrace Nechells  
CONTROL S YS TEM S & S ERVICES DIVIS ION  
P.O. Box 1819  
Tulsa, Oklahoma 74147 USA  
+1.918.317.4100 Fax: +1.918.317.4266  
E-mail: sales@fwmurphy.com  
Birmingham B7 5NG UK  
Rosenberg, Texas 77471 USA  
Phone: 281.633.4500 Fax: 281.633.4588  
E-mail: sales@fwmurphy.com  
Phone: +44 121 327 8500 Fax: +44 121 327 8501  
E-mail: info@computroniccontrols.com  
Web site: www.computroniccontrols.com  
Web site: www.fwmurphy.com  
INDUS TRIAL P ANEL DIVIS ION  
Fax: 918.317.4124  
E-mail: ipdsales@fwmurphy.com  
FW M URP HY INS TRUM ENTS (HANGZHOU) CO. LTD  
77 23rd Street  
FRANK W . M URP HY, LTD  
Church Rd Laverstock  
Hangzhou Economic & Technological Development Area  
Hangzhou, Zhejiang, 310018, China  
Phone: +86 571 8788 6060 Fax: +86 571 8684 8878  
Salisbury SP1 1QZ UK  
M URP HY P OW ER IGNITION  
Web site: www.murphy-pi.com  
Phone: +44 1722 410055 Fax: +44 1722 410088  
E-mail: sales@fwmurphy.co.uk  
Web site: www.fwmurphy.co.uk  
w w w . f w m u r p h y . c o m  
Printed in U.S.A. 07 8 793  
Printed in U.S.A.  
M-6797B page 4 of 4  
 

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