1.3.4 Abbreviations
Abbreviation Meaning in this document
DC
Direct current
DCU
Display and Control Unit from Pfeiffer Vacuum.
DN
Nominal diameter (diamètre nominal)
f
Rotation speed value of a vacuum pump (frequency, in rpm or Hz)
HPU
Handheld Programming Unit, aid for controlling and monitoring pump parameters
LED
Light emitting diode
MVP
Diaphragm vacuum pump
MSL
Mean sea level
[P:xxx]
Electronic drive unit control parameters. Printed in bold as a three-digit number in
square brackets. Frequently displayed in conjunction with a short description.
Example:
[P:312]
software version
PE
Earthed conductor (protective earth)
PWM
Pulse width modulation
(Type of modulation where one technical variable (e.g. electrical voltage) changes
between two values.)
T
Temperature (in °C), property abbreviation of the vacuum pump
TC
Turbopump electronic drive unit (turbo controller)
TPS
Voltage supply (turbo power supply)
Tbl. 2:
Abbreviations used in this document
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