LeeBoy 8520C - Heating Elements and Generator Testing; Heating Elements Specifications; Generator Voltage Testing Procedure

5-30 LeeBoy 8520C Conveyor Paver
Maintenance
To remove an element:
1. Remove top cover from the extension screed plate.
2. Loosen all the clamping studs over the element.
3. Remove and replace element.
4. After tightening the clamping stud, lock the clamp by
tightening the stud jam nut.
Generator Voltage TestingGenerator Voltage Testing
The generator is belt-driven (from the engine). When
the engine is running at 2100 RPMs (paving speed), the
generator produces 240 VAC.
This procedure must be performed by
a qualied electrical technician due to the danger of
electrical shock.
Input
Wires
Figure 5-34. Generator Voltage Testing
Test the generator voltage at the generator and at the
electric heat control box:
1. Use a volt meter to measure between the two main
input wires L-1 (black wire) and L-2 (white wire) at
the terminal block, which should measure 240 ± 5
VAC. (Figure 5-34) If you measure from L-1 to the
frame of the paver, or ground, the voltage should be
approximately 110 VAC.
2. If the voltage is lower, make certain the generator is
turning the correct speed by testing with a Hz meter
(valve should be 60 - 63 Hz.
3. If the voltage is still low, contact your authorized
LeeBoy dealer for generator speed tuning (see next
section).
Table 5-3. Element Resistance Table
Item STD Legend Screed
Generator Size (kW) 14.4 kW
Breaker Size 60 Amp
Main Screed Elements (2)
Wattage Per Element 3000 W
Total Wattage 6000 W
Resistance per Element 19 - 32 Ω
Screed Extension Elements (2)
Wattage Per Element 1500 W
Total Wattage 3000 W
Resistance per Element 52.5 - 62.6 Ω
Heated Endgate Elements (2) **
Wattage Per Element 500
Total Wattage 1000
Resistance per Element 88 - 108 Ω
** Optional item.
Heating ElementsHeating Elements
Each heating element is sized to t properly and provide
sufcient heat to the screed plate. Elevated temperature
prevents mix from sticking to the lower surface of the
screed plate.
An element assembly consists of four main components:
• The element.
• The wire protector adapter.
• The wire protector.
• The two-pin wire plug at the end of the element
protector.
Each element is covered by a thin strip of insulation
to keep heat from escaping. A support bar and shield
protects the element assembly.
Each element is clamped onto the screed plate to
provide a positive and efcient connection. Enough
pressure should be applied to the element assembly
to sufciently hold it securely against the screed plate
surface.