Toro Greensmaster TriFlex 3320/3420 Service Manual page 210

Main Power, Electric Cutting Reels Enable, Charge Circuit (Greensmaster 3320), Glow
(Greensmaster 3420) and Fan (Greensmaster 3420) Relays
The Greensmaster TriFlex Hybrid electrical system in-
cludes several identical, four (4) terminal relays for cur-
rent control. Most of these relays are located under the
right side cover next to the operator seat (Fig. 74). The
electric cutting reels enable relay is located under the
left side cover next to the operator seat (Fig. 75). Relays
can be identified by a tag near the relay wire harness
connector.
The main power relay provides electrical current to the
fuse blocks when energized by the ignition switch in the
RUN or START position. The main power relay is used
on both Greensmaster 3320 and 3420 machines.
The electric cutting reels enable relay is used to provide
48V logic power to the generator and reel motor control-
lers. It also supplies power to the main contactor in the
electric reel circuit. This relay is energized by an output
from the TEC controller. The reels enable relay is used
on both Greensmaster 3320 and 3420 machines.
The charge circuit relay used on Greensmaster 3320
machines provides a current path for alternator output
to reach the machine's electrical system. The charge cir-
cuit relay is energized by the Toro Electronic Controller
(TEC) when the ignition switch is in RUN or START.
The glow relay used on Greensmaster 3420 machines
provides electrical current to the engine glow plugs
when energized by the TEC controller.
The fan relay used on Greensmaster 3420 machines
provides electrical current to the engine cooling fan
when energized by the TEC controller. The fan relay is
energized when engine coolant temperature reaches
o
approximately 185 F (85
The reels enable relay, charge circuit, glow and fan re-
lays along with their circuit wiring should be tested as
a TEC controller output with the Hand Held Diagnostic
Display (see Hand Held Diagnostic Display in the Trou-
bleshooting section of this chapter) or InfoCenter Dis-
play (see InfoCenter Display in this chapter) before
disconnecting and testing the relay.
Testing
1. Park machine on a level surface, lower cutting units,
stop engine, apply parking brake and remove key from
ignition switch. Remove right side cover next to operator
seat to allow access to relays.
2. Make sure ignition switch is in the OFF position. Lo-
cate the relay to be tested and disconnect wire harness
electrical connector from relay. Remove relay from
bracket for easier testing.
Electrical System
o
C).
1. Relay (4 terminal)
2
1. 48V battery pack
Page 6 - - 60
1
2
Figure 74
2. Relay (5 terminal)
Figure 75
2. Reels enable relay
30
85 86
87
86 87
85 30
Figure 76
Greensmaster 3320/3420
1