User Manual
// Simpro MegaDumper®
Original Instructions // English // v86.0 // February 2022 // Page
38
Isolator switch
The MegaDumper is fitted with an isolator switch on the forward side of the powerpack
cover. This isolates the electrical systems from the power supply and should be turned OFF if
the machine is to be placed in storage, or if the powerpack cover needs to be removed.
The isolator switch must be turned OFF before the powerpack cover is removed.
Transformer
The MegaDumper is fitted with a transformer which outputs 24VDC current to the control
systems. The input voltage and frequency are specified to suit standard 1-phase mains
power in the intended country of use.
Variable Speed Drive
The MegaDumper is fitted with a Variable Speed Drive (VSD) unit, which provides 3-
h / VA / Hz c h l c c ‘ c f ’ Th v l
and frequency are specified to suit standard 1-phase mains power in the intended country
of use.
The VSD has many parameters that can be set to suit specific applications. They can be
modified or calibrated by a PC that has the appropriate program and cable drivers loaded.
The VSD can be fitted with a joystick controller to provide progressive control over the
lifting speed, as set out in
Residual voltages may be retained in the VSD after it has been disconnected from the
power supply. Use extreme caution when servicing all electrical components.
4.8
Hydraulic System
Powerpack
The hydraulic powerpack is supplied as a complete unit. The motor, pump, oil tank, and all
control valves are mounted into the centre manifold.
Control valves
The hydraulic system has four primary control valves:
4.8.2.1
Check valve
This is a one-way valve which prevents oil from flowing back through the pump when the
motor is stopped.
4.8.2.2
Pressure-relief valve
This is a spring-loaded valve which allows oil to flow back into the reservoir when the
hydraulic pressure exceeds its rated limit
–
usually from lifting an overweight bin, or from
operating the machine when the cradle is already at the top of the cycle.
4.8.2.3
Lowering valve
This is a solenoid-operated valve which opens when the LOWER button is pressed and allows
oil to flow back to the reservoir, lowering the cradle.
