Functional Description Block Functions - Fisher Scientific accuSpin 1R Service Manual

3 Functional Description
3.1 Block Functions
The accuSpin™ 1R is a refrigerated, microprocessor controlled low speed laboratory
centrifuge with maintenance-free induction drive motor. The unit is constructed as bench top
model with an extensive range of accessories.
The centrifuge is build on a low vibration solid polymer bottom plate, the housing is made of
sheet steel and surrounds the bottom plate completely. The front panel is made of a
resistant plastic material where a easy cleanable overlay is self-glued. Housing and front
panel are fixed tightly together to the bottom plate.
The rotors are started directly with a frequency controlled main maintenance-free induction
drive with high acceleration power. The drive is mounted with shock absorbers to the bottom
plate and sealed with a rubber flange to the rotor chamber.
The unit is equipped with a compressor plant filled with CFC-free refrigerant for temperature
control.
Following boards and components are located inside the unit (see block diagram page 4-1):
• Mains switch
• Main board with central processor and 2 fuses for board protection, one fuse for the
compressor
• Indication board with key and display processor
• Three phase induction drive motor with an integrated thermal over-temperature switch
(cut-out at 140°C).
• Speed detection board is mounted underneath the drive motor
• Imbalance switch with adjustable distance screw directed to the insulated contact plate
which is mounted onto the drive motor
• Lid lock assembly with solenoid and 2 integrated micro switches
• Brake resistor mounted on a heat protection plate
• Temperature Sensor PT100 is fixed thermally insulated with a plastic clip onto a distance
bushing inside the spin chamber
• Refrigeration unit (one phase induction drive motor with starting and running capacitor -
controlled by a starting relay)
• Fans for cooling the motor / electronic components and the condenser of cooling unit
Edition: 02
17.11.03 He/Ha
Functional Description
3 - 1 accuSpin™ 1R