FORM NO. 56043098 - Convertamatic
™
24, 26, 28, 32 / BA 625, 725, 825 - 29
RECOVERY SYSTEM
VACUUM MOTOR CONTROL CIRCUIT OVERVIEW (AUTO MODE)
See Figure 2.
+ (Positive) Circuit input starts with:
• A closed S3 key switch supplies the needed positive voltage to the K2 vacuum solenoid coil and the A1 control board J1-13 (Brn wire). Note: The A1 control
board scrub-on button must also be depressed (enabled). This operator command lowers the brush deck.
- (Negative) circuit input starts with:
• A battery negative ground input at the A1 control board terminal B-2 (J1-9) and at the A2 speed controller terminal B-.
• A negative voltage output from the A2 speed controller’s (pin #6) Brake Neg. to the A1 control boards Red/Blk wire (J1-5) For/Rev. Note: The A2 speed control
brake output (pin #6) occurs whenever the R1 directional/throttle pot is moved off its neutral setting. This operator command happens when the drive paddle is
pushed or pulled to run the wheel drive motor in Fwd or Rev.
The recovery tank fl oat switch (S4) must be closed in order for a negative voltage output from the A1 board’s terminal J1-12 Blk/Yel wire to complete the K2
solenoid coil circuit (Pos. & Neg.) and pulls in the solenoid load contact making the vacuum motor run.
Electrical Diagram
*For complete description of all callouts see Electrical System Wiring Diagram.
F1
FUSE,150A.
R1
POT.5K OHM THROTTLE
K2
COIL
VACUUM MOTOR CONTACTOR
S4
SWITCH, FLOAT
R2
POT. 100K OHM SPEED LIMIT
S3
SW, SPST KEY
M1
MOTOR, WHEEL DRIVE
M
BT1
BATTERY
F3
CIRCUIT BREAKER, 30AMP
F2
CIRCUIT BREAKER, 5AMP
M4
MOTOR, VAC
M
K2
12
1
2
3
12
1
2
3
+-
12
12
WHT
BRN/BLK
YEL/RED
RED
GRN
BLU
BRN
BLK
RED/BLK
BRN
RED/BLK
RED
WHT/YEL
BRN
RED
RED
BLK/YEL
GRA/WHT
ORN
ORN
BLU
BLK
BLK
BLK
BLK
BRN
WHT
BLU
BLK
BRN
WHT
BLK
RED
BLK
BLK
+
24VDC OR 36VDC
-
B+1
VACUUM CONTACTOR
FOR/REV.
VACUUM MOTOR SENSE
J1-13
J1-12
B-2
A1
CONTROL BOARD
J1-5
J2-10
J2-4
J1-9
RECOVERY TANK FULL SENSE
A2
B+ B-
1210 SPEED CONTROLLER
M1
M2
PIN 3-POT. HI
PIN 4-POT. WIPER
PIN 13-POT. LO
PIN 5-KSI
PIN 6-BRAKE(-)
(1228 FOR 36V)
PIN 18-SPEED LIMIT POT
J1-3
J2-3
J2-2
FIGURE 2
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