Ramp--Up Module - Toro Groundsmaster 4500-D Service Manual

Ramp- -up Module
The ramp--up module is located under the console cover
(Fig. 19).
1
2
The ramp--up module is used to prevent hydraulic
spikes that could affect cutting system hydraulic compo-
nents. As the PTO relay for decks #1 to #5 is energized,
the ramp--up module provides a gradual, increasing cur-
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's located on the module below the harness connec-
tion.
Figure 19
1. All module LED's will be off when the PTO switch is
1. Ramp- -up module 2. Harness connection
OFF.
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. All LED's will go out immediately with the interruption
of PTO operation (e.g. PTO switch turned off or cutting
deck raised).
Electrical System (Rev. A) Page 5 - - 14 Groundsmaster 4500--D/4700--D