National Crane 03-20-2019 Control # 613-06 3-1
NBT30H-2 SERVICE MANUAL ELECTRIC SYSTEM
SECTION 3
ELECTRIC SYSTEM
SECTION CONTENTS
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
General Electrical Understanding . . . . . . . . . . . . . 3-1
Comparing Electrical System to a Hydraulic
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
General Maintenance Introduction . . . . . . . . . . . . 3-2
General Troubleshooting . . . . . . . . . . . . . . . . . . . 3-2
Connector Troubleshooting . . . . . . . . . . . . . . . . . 3-2
Troubleshooting Electrical System . . . . . . . . . . . . 3-3
Ignition Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
RCL system description. . . . . . . . . . . . . . . . . . . . . 3-3
Anti-two-Block System Description . . . . . . . . . . . 3-4
A2B Cable Repair . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Micro Relay/fuse block. . . . . . . . . . . . . . . . . . . . . . 3-6
Directional Control Valve Solenoids. . . . . . . . . . . 3-7
Outrigger Manifolds . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Front Outrigger Manifold . . . . . . . . . . . . . . . . . . . . 3-7
Rear Outrigger Manifold . . . . . . . . . . . . . . . . . . . . 3-9
Hydraulic Oil Cooler Option . . . . . . . . . . . . . . . . . . 3-9
RCL Communication Overview . . . . . . . . . . . . . . 3-10
RCL CANbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
RCL Sensor Calibration . . . . . . . . . . . . . . . . . . . . 3-19
Slew Potentiometer Calibration . . . . . . . . . . . . . . 3-19
Boom Angle Sensor Calibration. . . . . . . . . . . . . . 3-20
Boom Length Sensor Calibration. . . . . . . . . . . . . 3-20
Rod Side Pressure Sensor Calibration . . . . . . . . 3-21
Base Side Pressure Sensor Calibration . . . . . . . 3-21
Outrigger Length Calibration . . . . . . . . . . . . . . . . 3-22
Load Chart and RCL Download. . . . . . . . . . . . . . 3-22
DESCRIPTION
The truck electrical system is a standard 12 volt DC
automotive type and supplies power for all crane functions.
The wire harness is routed through the truck frame and
contains all wiring interface between the truck and the crane
including the electric outrigger controls.
MAINTENANCE
General Electrical Understanding
To aid in the understanding and troubleshooting of an
electrical system, review the terms and information that
follows.
Electrical Energy - power which comes from the movement
of electrons. Electrons are particles with a negative charge.
Electrons will collect around particles with a positive charge,
called protons, until an electrical imbalance occurs.
Amperage - rate of flow of electrons (Current), measured in
amperes.
Voltage - the electromotive force (EMF) which causes
electrons to move through an electrical circuit, measured in
volts.
Resistance - any resistance to flow of electrons in an
electrical circuit, measured in Ohms.
Ohm’s Law - Electric current increases in direct relation to
the voltage and decreases in relation to the amount of
resistance in any circuit.
To Find:
• EMF (Voltage) - Multiply CURRENT (amps) by
RESISTANCE (Ohms).
• RESISTANCE (Ohms) - Divide EMF (voltage) by
CURRENT (amps).
• CURRENT (Amps) - Divide EMF (voltage) by
RESISTANCE (Ohms).
Consider the following when trying to find trouble in an
electrical system:
1. Current always flows from (+) positive to (-) negative, or
from the point of highest voltage.
CAUTION
Know the electrical circuit before connecting or
disconnecting an electrical component. A wrong
connection can cause personal injury or damage to the
component and/or system.
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