Toro Groundsmaster 7210, Руководство по обслуживанию

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Dual Temperature Switch
g034740
Figure 168
1. Dual temperature switch
g035304
Figure 169
1. Dual temperature switch 3. Warning circuit
2. Shutdown circuit
The dual temperature switch includes 2 normally open circuits that are used
to monitor the engine coolant temperature. These switch circuits are the
high-temperature warning circuit and high-temperature shutdown circuit. The
dual temperature switch is attached to the engine water pump housing (
Figure
168 ).
When the engine coolant temperature rises to approximately 105°C (220°F),
the high-temperature warning circuit closes. This closed circuit provides an
input to the Standard Control Module (SCM). This input causes the SCM
high-temperature warning LED to illuminate and the PTO implement to shut
down.
If the engine coolant temperature rises to approximately 115°C (240°F), the
high-temperature shutdown circuit closes and provides an input to the Standard
Control Module (SCM). This input causes the SCM high-temperature shutdown
LED to illuminate and the engine to shut down.
The Standard Control Module (SCM) monitors the operation of the dual
temperature switch. If excessive coolant temperature causes either the switch
circuit to close, the appropriate LED on the SCM illuminates. Test the switch
Groundsmaster 7210 Page 5–45 Electrical System: Testing the Electrical Components
16222SL Rev C