ELECTRICAL
The Figures below show typical customer switch wiring for the ST8. Switch wiring should be run separately from other wires; DO NOT route switch wires with AC power wires since voltages, that may be induced into the switch wires, may exceed rating and cause damage to circuits or cause false trips.
Figure 1 shows the wiring for a normally open (N.O.) SWICH- GAGE® connected between terminal B and the negative power input. A metal jumper is connected between A and B. When the SWICH- GAGE® closes the shutdown/alarm circuit will be initiated.
Figure 2 shows the wiring for a normally closed (N.C.) switch connected to input terminals A and B. The factory installed
A | A |
| |
B | B |
Figure 1: Typical N.O. | Figure 2: Typical N.C. |
Sensor Connection | Sensor Connection |
metal link must be removed to use this wiring. When the switch opens the shutdown/alarm will be initiated.
Figure 3 shows the wiring for a N.O. SWICHGAGE® which is the same as Figure 1 except two wires are run from terminals A and B to the SWICHGAGE®. This Closed Loop™ wiring circuit monitors the wires as well as the switch. If the circuit is opened due to a loose connection or broken wire or the SWICHGAGE® closes, the shut- down/alarm circuit will be initiated.
Figure 4 shows the ST8 internal SPDT relay in the “run” or operat- ing mode.
| 9 | 10 | 11 |
| N.O. | N.C. | C |
A |
|
|
|
B |
|
|
|
Figure 3: Typical N.O. | Figure 4: Internal Relay | ||
Closed Loop™ Sensor Connection |
| Circuit |
|
Typical Wiring
Below is a typical wiring diagram for the ST8 TATTLETALE®.
|
| Start |
| Flyback | Pushbutton |
To Hold Coil | Diode |
|
|
|
Flyback Diode
To Battery +
Starter
Flyback To
Diode
Flyback | Coil | Distributor |
Diode |
|
|
Push/Pull Solenoid | Solenoid Valve | Slave Relay |
NOTE: Connect only one shutdown device to the ST8. Wiring
for Push/Pull Solenoid, Solenoid Valve and Slave Relay shown for clarity only.
ON/OFF
2 AmpSwitch
Fuse
Battery
Engine Oil | Internal Relay | |
Pressure | ||
(shown in | ||
| run mode) | |
Engine Water | ST8 | |
Temperature | Shutdown | |
| Sensor Inputs | |
Low |
| |
Water |
| |
Level |
|
No Connection
No Connection
Differential
Pressure
9 10 | 11 | 12 | 13 | 14 |
Run |
|
|
|
|
AA
5 1
BB
AA
6 2
BB
AA
7 3
BB
AA
8 4
BB
ON
1 2 3 4 5 6 7 8
Remove jumper from terminals 12 and 13 and set individual sensor Lockout Switch for a 25 to 35 second lockout time delay during startup (see page 4 Setting Lockout Switches).
Jumper Wire (customer supplied)
ST8
Shutdown
Sensor Inputs
No Connection
No Connection
Sensor Lockout Switches
