Electrical System Operation; Electrical System Operation; 12 Volt Dc System Operation; Electric Reel Drive System (48 Volt Dc) Operation - Toro Greensmaster TriFlex 3320/3420 Service Manual

Electrical System Operation

Greensmaster TriFlex Hybrid machines use two (2) sep-
arate electrical systems. Most machine functions oper-
ate on a typical 12 volt DC system. The second system
exists to operate the electric cutting reels and is a 48 volt
DC electrical system. Basic information about the two
systems is included below.

12 Volt DC System Operation

Engine electrical components, machine operation
switches, hydraulic solenoid coils and the machine TEC
electronic controller are all included in the 12 volt system
on Greensmaster TriFlex Hybrid machines. A 12 volt
battery on the left side of the machine provides system
electrical power. Circuit protection for the 12 volt system
includes two (2) fuse blocks and several fusible links.

Electric Reel Drive System (48 Volt DC) Operation

Greensmaster TriFlex Hybrid machines utilize an en-
gine driven generator to supply 48 volt DC electrical
power to a set of three (3) electric motors that drive the
cutting reels. The 48 volt system includes the engine
driven generator assembly, the three (3) cutting reel mo-
tors, a 48 volt battery pack, the main contactor and con-
trol modules. Circuit protection for the 48 volt system
includes two (2) fuses.
The generator is a 48 VDC, 5400 watt, air cooled, brush-
less, permanent magnet device. The generator has its
own integral invertor and on--board controller. The ma-
chine TEC controller provides generator direction with
communication via the CAN--bus system.
The three (3) cutting reel motors are identical 48 VDC,
1100 watt, brushless, permanent magnet motors. Each
motor has its own integral invertor and on--board con-
troller. The machine TEC controller interfaces the reel
motor via the CAN--bus system.
The battery pack is composed of four (4) 12 volt sealed
batteries connected in series to achieve the necessary
48 VDC. The batteries are included in the system to en-
sure that reels come up to speed quickly when initially
engaged. The batteries are also used as a buffer when
the cutting reels are shut off. As the cutting reels slow to
a stop, they generate electrical power that is absorbed
by the battery pack. The batteries also assist with sys-
tem precharge and diagnostics.
The main contactor exists in the electric reel drive sys-
tem to connect the battery pack with the generator and
reel motor controllers. The generator controller deter-
mines when the main contactor is engaged.
Electrical System
Information about electrical components in the 12 volt
system is included in the Component Testing section of
this chapter.
Control for the components in the electric reel drive sys-
tem is handled by integral controllers in the generator
and reel motors along with direction from the TEC ma-
chine controller via the CAN--bus system. Since the TEC
controller (12 VDC component) sends and receives in-
formation with the generator and reel motors (48 VDC
components), the CAN--bus circuit needs to communi-
cate with both systems. The isolation module is included
in the system to allow effective communication while
keeping the two machine electrical systems isolated.
Also, the location ID module exists to identify the loca-
tion of the three (3) cutting reel motors. This allows such
machine features as raising the center cutting unit
slightly later than the front cutting units.
The 48 volt system is an isolated system so the vehicle
frame is not used for any ground connections in this sys-
tem. A 48V battery disconnect is included on the ma-
chine which can be used to disconnect the cutting unit
motors from the electrical power supply to prevent unex-
pected reel motor operation when performing service.
IMPORTANT: When connecting the battery pack in
the 48 volt system, make sure that battery polarity
is carefully checked. System damage can occur if
batteries are not connected correctly.
Information about electrical components in the 48 volt
system is included in the Component Testing section of
this chapter.
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