Ramp--up Module
Theramp--upmoduleislocatedundertheconsolecover
(Fig. 19).
1
2
The ramp--up module is used to prevent hydraulic
spikes thatcouldaffectcuttingsystemhydraulic compo-
nents. As the PTO relay for decks #1 to #5 is energized,
theramp--upmoduleprovidesagradual,increasingcur-
rent flow to the cutting deck solenoid valves. Solenoid
ramp--up time occurs in 1.75 seconds. The Ramp--up
module has no affect on operation of decks #6 and #7
on the GM 4700--D.
The ramp--up module can be monitored by the three
LED’slocatedonthemodulebelowtheharnessconnec-
tion.
Figure 19
2.
1.
OFF.
All module LED’s will be off when the PTO switch is
1.
Ramp--up module
Harness connection
2.
When the PTO switch is turned ON and interlock
switches allow cutting deck operation (seat occupied,
decks lowered, etc.), the “Power” LED will illuminate im-
mediately. The “S1” and “S2” LED’s will gradually illumi-
nate during the 1.75 second ramp--up time.
3.
After initial PTO startup, all LED’s will be illuminated
fully while PTO is ON.
4.
of PTO operation (e.g. PTO switch turned off or cutting
deck raised).
AllLED’swillgooutimmediately with theinterruption
Electrical System (Rev. A)
Page 5 -- 14
Groundsmaster 4500--D/4700--D
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