Tennant 6100E, Service Manual

Page: 217 / 228

ELECTRICAL
4--75
6100E 330255 (9--00)
NO PROPEL AT MACHINE POWER UP (STANDARD CONTROLLER)
NORMAL OPERATION:
1. With throttle potentiometer in the neutral position (2.5V on P1--2) M1 and M2 are held at B+ voltage, and the
motor does not move.
2. With throttle potentiometer in the forward position (2.5V to 5.0V on P1--2) M1 is held at B+ voltage, and M2 is
pulsed to ground. The voltage applied to the motor is proportional to how high the throttle voltage goes
above 2.5VDC.
3. With throttle potentiometer in the reverse position (2.5V to 0V on P1--2) M2 is held at B+ voltage and M1 is
pulsed to ground. The voltage applied to the motor is proportional to how low the throttle voltage
goes below 2.5VDC.
TURN KEYSWITCH TO START POSITION THEN RE-
LEASE TO THE ON POSITION.
NOTE: THE SEAT SWITCH MUST BE ACTIVATED
FOR ALL OF THIS TESTING.
B+ VOLTAGE
0 VOLTS
CHECK FOR VOLTAGE ON 34/BLU AT
P1--6 OF THE MOTOR CONTROLLER.
NOTE: THE CONTROLLER MUST SEE A NEUTRAL SIGNAL FROM THE THROTTLE POTENTIOMETER
(2.5VDC ON P1--2) AFTER POWER UP OR IT WILL NOT PROPEL FORWARD OR REVERSE.
NOTE: DISCONNECT THE PROPEL MOTOR OR LIFT THE PROPEL WHEEL OFF THE FLOOR BEFORE
PROCEEDING WITH THESE TESTS.
34/BLU, 27A/GRN, OR THE
SEAT SWITCH ARE OPEN.
CHECK VOLTAGE BETWEEN 5B/GRN
AND 13L/BLK AT THE MOTOR CONTROLLER.
0 VOLTS
WIRES 5B/GRN OR
13L/BLK ARE OPEN.
B+ VOLTAGE
DISCONNECT P1 CONNECTOR AND RECONNECT IT
SO THAT ONLY 34/BLU IS HOOKED UP TO P1--6. NOTE:
P1--6 MUST HAVE B+ VOLTAGE FOR THE NEXT TEST.
VERIFY THE THROTTLE VOLTAGES:
P1--1 = 0 VDC
P1--2 = 2.5 VDC
P1--3 = 5 VDC
ALL VO/-- .3 VDC
VOLTAGES INCORRECT
REPLACE THE
MOTOR CONTROLLER.
VOLTAGES MEET SPEC
RECONNECT THE P1
CONNECTOR PROPERLY
VERIFY THE THROTTLE SIGNAL VOLTAGES:
P1--2 = GREATER THAN .5 VDC IN REVERSE
P1--2 = 2.5 VDC IN NEUTRAL
P1--2 = LESS THAN 4.5 VDC IN FORWARD
ALL VO/-- .3 VDC
P1--2 IS NOT CHANGING
WIRES 28/BRN, 29/GRY, 31/YEL ARE
OPEN OR THE POTENTIOMETER
THROTTLE IS DISCONNECTED OR BAD.
POTENTIOMETER TESTING
1. THE POTENTIOMETER SHOULD MEASURE 5000+/-- 200 OHMS
BETWEEN CONNECTOR POSITIONS A AND C.
2. THE POTENTIOMETER RESISTANCE BETWEEN CONNECTOR POSI-
TION B AND CONNECTOR POSITION A OR C SHOULD CHANGE FROM 0
OHMS TO 5000 OHMS WHEN THE POTENTIOMETER IS TURNED.
3. WHEN THE POTENTIOMETER IS CENTERED THE RESISTANCE BE-
TWEEN CONNECTOR POSITION B AND POSITION A OR C SHOULD BE
HALF OF THE TOTAL RESISTANCE. (ABOUT 2500 OHMS)
VOLTAGES CORRECT FOR FOR-
WARD AND REVERSE BUT
NEUTRAL VOLTAGE IS HIGH OR LOW
POTENTIOMETER THROTTLE IS NOT
CENTERED PROPERLY. READJUST
LINKAGE AT FOOT PEDAL.
CONTINUED ON NEXT PAGE
THROTTLE SIGNAL VOLTAGES ARE WITHIN SPEC.
NOTE: THE MACHINE IS
PASSING THE POWER
UP TESTING.
DISCONNECT THE POTENTIOMETER FROM THE CONTROLLER