Timer/ Relay; Motor - Thermo IEC Medilite Vereinfachte Bedienungsanleitung

5.3

Timer/ Relay

The Thermo IEC Medilite has a built-in 30-minute mechanical timer. It
also has a hold mode for indefinite time runs. The timer acts as a switch
delivering power to the motor. To replace it, the knob must be removed.
The knob is pressed onto the timer shaft and may require pliers to remove.
The timer is secured to the base with a nut.
When the timer is set, the timer, through the relay, delivers 120VAC to the
motor. This can verified using a voltmeter measuring across the two black
leads coming out of the timer.
5.4

Motor

The Thermo IEC Medilite uses a brushless induction drive motor. It
requires no maintenance. The speed of the motor is approximately 3100
rpm (60 Hz) or 2700 rpm (50 Hz). This can be verified using an optical
tachometer through the viewport in the cover. (Note: Less than nominal
line voltage will affect the centrifuge's top speed.)
When isolated, the motor resistance should be approximately 12 Ω. To
replace the motor, remove the four nuts, which secure it to the base.
Disconnect the wiring harnesses of the motor to the relay.
Medilite Operation Manual
9