Operating Instructions

Glossary
Siemens Building Technologies, Inc. 127
Skip Frequency
Frequencies that are skipped to avoid effects of mechanical
resonance. Also see Skip Frequency parameter P1091.
Slip Compensation
Dynamically adjusts the output frequency of the SED2 so that the
motor speed is kept constantly independent of the motor load. Also
see Slip Compensation parameter P1335 in the Parameter Reference
Guide (125-3214)
Stator Resistance
Impedance produced from each motor winding.
Train (HVAC)
Sequence or succession of mechanical equipment.
Undervoltage
A SED2 fault condition that occurs, for example, when input line
power has failed or is outside the voltage reduction tolerance. Also
see Fault Code F0003.
VFD/VSD
Variable Frequency Drive/Variable Speed Drive. Both terms are used
for a device that controls the frequency or speed of another device
such as a fan or pump motor.