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ST-94112N page 4 of 4
BASIC OPERATION
ST8
1. Apply power to the ST8 TATTLETALE
®
(terminals 13 and 14).
2. The “POWER ON” and “RUN” LED light will switch On. The
“POWER ON” LED indicates power has been applied to the ST8.
The “RUN” LED indicates the internal relay is in the
operating mode.
3. The lockout time delay during startup will begin timing. Sensors with
lockout time delay selected (see Setting Lockout Switches below) will
not trip alarm or shutdown circuit until time delay times out (25-35
seconds). If lockout switches are not set there will not be a time
delay during startup.
4. The 8 Red shutdown LEDs are for shutdown indication (see
Figure 6).
5. When a shutdown signal is received from a SWICHGAGE
®
, the
shutdown LED will light and internal shutdown relay will switch to
activate a shutdown device (see Typical Wiring page 3). All other
shutdown sensor inputs are locked out.
6. Shutdown LED will remain on even if conditions return to normal.
To clear the LED, power must be removed or push button reset
is operated.
Setting Lockout Switches
Lockout switches allow you to lockout shutdown/alarm sensors during
startup. For instance, on a pressure SWICHGAGE
®
, the lockout time
delay allows time for pressure to build up thus lifting the pointer off the
low limit contact. If the lockout time delay is not set the TATTLE-
TALE
®
will initiate the shutdown/alarm sequence.
Each sensor input on the ST8 has a lockout
time delay at startup with a length of 25 to
35 seconds.
1. Locate the lockout switches on back
of the unit (see Figure 7).
2. Determine which sensors you wish
to lock out. Switch the corresponding
sensor lockout switch “ON”. A SEN-
SOR CAN BE LOCKED-OUT
ONLY WHEN ITS LOCKOUT
SWITCH IS SWITCHED “ON”.
3. Remove the jumper between terminals 12 and 13. This will activate
the time delay. If this jumper is not removed the lockout time delay
will not function.
On back
of unit
Lockout
Switches
ON
1
2 3 4 5 6 7 8
Figure 7
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819; Rosenberg, Texas 77471; USA
+1 281 633 4500 fax+1 281 633 4588
e-mailsales@fwmurphy.com
MURPHY DE MEXICO, S.A. DE C.V.
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
+52 444 8206264 fax +52 444 8206336
Villahermosa Office +52 993 3162117
e-mailventas@murphymex.com.mx
www.murphymex.com.mx
FRANK W. MURPHY, LTD.
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
+44 1722 410055 fax+44 1722 410088
e-mailsales@fwmurphy.co.uk
www.fwmurphy.co.uk
MURPHY SWITCH OF CALIFORNIA
41343 12th Street West
Palmdale, California 93551-1442; USA
+1 661 272 4700 fax+1 661 947 7570
e-mailsales@murphyswitch.com
www.murphyswitch.com
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.
MACQUARRIE CORPORATION
1620 Hume Highway
Campbellfield, Vic 3061; Australia
+61 3 9358 5555 fax+61 3 9358 5558
e-mailmurphy@macquarrie.com.au
FW Murphy
P.O. Box 470248
Tulsa, Oklahoma 74147 USA
+1 918 317 4100
fax +1 918 317 4266
e-mail sales@fwmurphy.com
www.fwmurphy.com
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USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
Printed in U.S.A.
Warranty
A limited warranty on materials and workmanship is given with this FW Murphy product.
A copy of the warranty may be viewed or printed by going to www.fwmurphy.com/support/warranty.htm