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Proximity Switches
The ProCore 648 uses six (6) identical proximity
switches. These switches are normally open switches
that close when a sensing plate is positioned near the
target end of the switch (Fig. 32).
The reverse and neutral proximity switches are
mounted on the control handle under the handle con-
sole (Fig. 29). They use sensing plates pinned to the
traction lever.
The transport limit #1 (top) and #2 switches and aeration
#3 and #4 (bottom) switches are mounted on a mounting
bracket attached to the right rear frame (Fig. 30). The
sensing plate for these switches is welded to the coring
head H–frame.
The neutral proximity switch is used in the starting circuit
to make sure that the traction lever is in the neutral posi-
tion when starting the engine. This switch is closed when
the traction bail is in the neutral position and opens when
the bail is moved to either the forward or reverse direc-
tion.
The reverse proximity switch is one of the components
used in the “OK to lower” circuit that acts as an input for
the aerator control module. This proximity switch is
closed when the traction lever is in either the neutral or
reverse position. When the traction lever is moved to the
forward direction, the reverse proximity switch opens.
The transport limit #1 proximity switch is closed when
the coring head is fully raised and opens almost immedi-
ately as the coring head begins to lower. This switch is
used as an input for the aerator control module to indi-
cate that the coring head is in the transport (raised) posi-
tion. Transport limit #1 switch operation can be
monitored using the control module transport #1 input
LED.
The transport limit #2 proximity switch is closed when
the coring head is fully raised and opens as the coring
head is being lowered. This switch is one of the compo-
nents in the lockout circuit used to provide current for the
raise and lower solenoids.
The aeration #3 proximity switch is closed as the coring
head is lowering to allow the electric clutch to be ener-
gized. The switch opens as the coring head is raising.
The aeration #4 proximity switch is closed when the cor-
ing head is fully lowered and opens as the coring head
begins to raise. This switch is used as an input for the
aerator control module to identify when the coring head
is in the aerate position. Aeration #4 switch operation
can be monitored using the control module aerate #4 in-
put LED.
3
1
2
4
Figure 29
1. Reverse proximity switch
3. Neutral proximity switch
2. Reverse sensing plate
4. Neutral sensing plate
1
2
3
Figure 30
1. Switch mount bracket
3. Coring head H–frame
2. Sensing plate
3
2
1
5
FRONT
RIGHT
Figure 31
1. Transport limit #1
4. Aeration #4
2. Transport limit #2
5. Switch mount bracket
3. Aeration #3
Electrical System
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ProCore 648
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