Table
of Contents
SORVALL®
Centrifuges
Contents
(continued)
Paragraph
Page
Section
6.
System
Descriptions
(continued)
Electrical
Systems
....................................6-10
6-10. Door Interlock Circuit
..............................
.6-12
6-11. Time Control
....................................
.6-13
6-12.
Speed
Control
Knob
...............................
.6-14
6-13.
Temperature
Control
..............................
.6-15
6-14.
Zero
Crossing
Detection
Circuit
......................
.6-15
6-15.
SCR
(Selecon
Rectifier)
Bridge
Circuit
..................
.6-17
6-16.
SCR
Phase
Angle
Control Circuit
.....................
.6-18
6-17.
Delayed
Start Circuit
..............................
.6-19
6-18. Slow Start
PWM
(Pulse
Width
Modulation) Circuit
.........
6-20
6-19.
Main
Speed
PWM
(Pulse
Width
Modulation)
Circuit
.......
.6-22
6-20.
Anticipation
Component
Voltage Equivalent
.............
.6-22
6-21.
Closed-Loop
Speed
Control
..........................
.6-24
6-22.
Open-Loop Speed
Control
...........................
.6-24
6-23. Brake Circuit
....................................
.6-25
6-24.
200 RPM
Switch
..................................
.6-27
6-25.
Zero
Speed
Detection Circuit
........................
.6-28
Run-Interrupt
Errors
..................................
6-29
6-26.
Improper
Drive
Belt
Tension
Fault
.....................
6-29
6-27. Rotor Imbalance
Fault
.............................
.6-31
6-28.
Overtemperature
Fault
.............................
.6-32
6-29.
Undertemperature
Fault
............................
.6-33
6-30,
Motor Thermal Overload
Fuse
Fault
...................
.6-34
vi
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