BYD P20PS, Operator'S Manual

MAINTENANCE

OPERATOR MANUAL

45

P20PS

46

OM-P20PS2019001-EN

06A29

ANT. MISSING 

06A0

WAITING DATA  

Waiting for data

1.Check if the CAN BUS communication line is connected properly;

2.Check if the bit rate of the communication is consistent;

06A0

EPS NOT ALIGNED

Waiting for data

1.Check if the zero proximity switch is installed properly;

2.Check if the zero proximity switch is correctly selected;

3.Check if the output data of zero proximity switch is correct;

06A0

WAITING FOR TRAC

Waiting for towing controller

1.Check if the CAN BUS communication line is connected properly;

2.Check if the connection line of interlock switch is correct;

3.If the interlock switch is controlled by tiller, set TILLER SEITCH as HANDLE;

06A0

KEYOFF

Key switch voltage low

1.Check if the key switch voltage receives a low voltage pulse when turning on the external 

load;

2.Check if B+ and B- are firmly connected to the controller;

3.If the fault is reported every time the key is turned on, replace the controller;

06A25

ENCODER ERROR 

Encoder fault

The controller detects that two successive speed readings of the encoder differs greatly from 

each other. A normal encoder in the system cannot change speed readings greatly within a 

very short time. Hence, a possible cause for the symptom is that the wires of one or more 

encoders are worn or broken. Check the mechanical and electrical parts of the encoder. 

Another possible for the symptom is electromagnetic interference from the sensor bearing. If 

the symptom is not due to the two causes, replace the controller.

Note: Sometimes manual operations may also cause this fault indicating on the controller. In 

these cases, it is required to turn off power supply and start the forklift again. For example:

1.The forklift suddenly collides with an obstacle so that it is incapable of travelling;

2.The driver applies the brake sharply while the forklift is travelling at a high speed.

06A7

Q LINE SENSOR KO

Step motor Q LINE voltage 

failure

1.Check if the stepper motor cable is intact;

2.Resistance between Q line and B- too small (Approaching 30Ω);

06A6

D LINE SENSOR KO

Step motor D LINE voltage 

failure

1.Check if the stepper motor cable is intact;

2.Resistance between D line and B- too small (Approaching 30Ω);

06A27

GAIN EEPROM KO 

EEPROM memory current 

value is different

Replace the controller;

06A11

DATA ACQUISITION

Data collection

Activation of this fault indicates data acquisition is under way. Wait data acquisition is 

completed.

06A24

MICRO SLAVE KO

Main and slave microprocessor 

detection does not match

1.When using a stepper motor, the direction of the stepper motor detected by the main

microprocessor and slave microprocessor is inconsistent;

2.In the closed-loop control system, the direction of the stepper motor detected by the main 

contactor is incorrect and is inconsistent with the direction of the stepper motor detected by 

the slave contactor;

3.The main contactor did not detect the steering limit position, but it was detected by the

slave contactor;

06A28

CAN BUS KO 

CAN BUS communication fault

1.Check if the CAN BUS communication line is connected properly;

2.Check if the bit rate of the communication is consistent;

3.Check if the CAN communication is open;

4.Check if the CAN communication loop resistance is 60Ω.

06A22

S.P OUT OF RANGE

Output steering potentiometer 

out of range

If a single potentiometer, such as CPOC1 end, is out of range 0.8V-4.2V, it will alarm. When 

the dual potentiometer is selected, the sum of the two sliding ends (CPOC1+CPOC2) is out 

of the range of 4.4V-5.5V and it will alarm. Check the connection of potentiometer.

06A23

F.B OUT OF RANGE

Feedback of steering motor 

encoder out of range

Feedback potentiometer (CPOT connecting to CNB#6) has fault, it will alarm. The range of 

CPOT is out of 0.3V-4.7V, it will alarm. Check if the steering motor encoder is connected 

correctly and whether there is a open circuit;

06A21

MICRO SLAVE

The information on the 

status bus between the main 

microprocessor and slave 

microprocessor is frozen to the 

OXFF value.

The controller should be replaced;

06A19

KM OPEN     

Main contactor of slave 

contactor open

Slave contactor monitors the open of safety contactor of main contactor, and the controller 

needs to be replaced;

06A18

KS OPEN 

Safety contactor of slave 

contactor open

Main contactor monitors the open of safety contactor of slave contactor, and the controller 

needs to be replaced;

06A17

KM CLOSED 

Safety contactor of main 

contactor closed in advance

Slave contactor monitors the advanced close of safety contactor of main contactor, and the 

controller needs to be replaced;

06A16

KS CLOSED 

Safety contactor of slave 

contactor closed in advance

Main contactor monitors the advanced close of safety contactor of slave contactor, and the 

controller needs to be replaced;