Section 5. Troubleshooting
Toyota Model 7HBW23 Service Manual
Definitions
Definitions
Continuity
Acceleration
A continuous and uninterrupted path between two or more locations in an electrical circuit, typically having a resistance of less than 1 ohm.
The process where the truck’s acceleration characteristic is determined when the truck starts from a stop. This is a operator parameter (Acceleration). The range is from 30% to 90% in increments of 5%. Default is 80%. A lower number gives less aggressive acceleration. See “Parameters (P)” on page 5-17.
Arm Angle Switches The Arm Angle Switches (S24 and S25) determine brake activation and truck travel speed. Each switch is activated by the control handle. The control handle must be positioned between 6° of vertical and 8° of horizontal for the switches to be closed. See Figure 5-1.
8° 1820 001.EPS
Arm Angle Switches and Brake Actuation
When the control handle is in the full upright position, the parking brake engages. When the control handle is positioned from 6° to 46° of the full upright position, the brake disengages (when travel is requested), Arm Angle B switch (S25) closes and enables slow speed travel. See Table 5-2. When the control handle is placed beyond 46° from the full upright position, Arm Angle A switch (S24) also closes, enabling fast speed travel. When the control handle is placed within 8° of horizontal, Arm Angle switch B opens, activating the parking brake. Table 5-2. Control Handle/Switch Positions Position Top 6°
6° to 46° 46° plus Bottom 8°
5-6
A Switch Open Open Closed Closed
B Switch Open Closed Closed Open
Creep speed is a service parameter that defines speed at low throttle positions. Creep speed range is adjustable from –10 to 10. The factory default value is –5. A negative number enhances low speed maneuverability. A positive number makes the truck more responsive. See “Parameters (P)” on page 5-17.
Current Limiting A protective function of the power amplifier that prevents excessive current levels from damaging drive components.
Deceleration
6°
Figure 5-1.
Creep Speed
Function Brake Applied Slow Speed Fast Speed Brake Applied
The process where the truck’s braking (regenerative) characteristic is determined by any reduction in throttle, including neutral. This is a operator parameter (Deceleration). See “Parameters (P)” on page 5-17. The range is from 40% to 90% in increments of 5%. Default is 65%. A lower number gives less aggressive deceleration.
Emergency Reverse Emergency Reverse is activated when the emergency reverse button is pressed while the control arm is in a drive position. After the button is released, normal operation is resumed.
ETAC (Electronic Tiller Arm Card) Programmable motor control functions are performed by the electronic circuitry (ETAC) housed within the control handle. See “Electronic Tiller Arm Card (ETAC)” on page 3-7.
00700-CL340-05, Issued: 2 May 2005
