Operating Instructions

SED2 VFD Operation & Maintenance Manual
54 Siemens Building Technologies, Inc.
NOTES:
1. The ON and the consecutive OFF1 command must have the same source.
2. If the ON/OFF1 command is set for more than one digital input, only the last set digital
input is valid; for example, DIN3 is enabled.
OFF2
This command causes a free coasting of the motor to standstill (impulses for the power
section of the SED2 are disabled).
NOTE: The OFF2 command may have one or several sources. By default, the OFF2
command source is set to BOP/AOP. This source remains even if other sources
are defined by Selection of Command Source parameter P0700 or Function of
Digital Inputs 1 to 8 parameters P0701 through P0708.
OFF3
An OFF3 command causes the motor to decelerate rapidly.
For starting the motor when OFF3 is set, the binary input must be closed (high). If OFF3 is
high, the motor can start and stop by OFF1 and OFF2.
If OFF3 is low, the motor cannot be started.
Control Types (P1300)
The different control types of the SED2 control the relationship between the motor speed and
the voltage supplied by the SED2. Below is a summary of the available control types:
Linear V/f control, P1300=0
For variable or constant torque applications such as delivery systems and positive
displacement pumps.
Linear V/f control with flow control (FCC), P1300=1
This factory-set control mode can improve performance and dynamic behavior of the motor.
Parabolic V/f control, P1300=2
A factory-set control mode for variable torque load such as fans and pumps.
Multi-point V/f control, P1300=3
Linear V/f control with energy saving mode, P1300=4
Automatically increases or decreases the motor voltage to locate the lowest possible energy
consumption. As soon as the default setpoint speed is reached, the control mode is enabled.
V/f control for textile applications, P1300=5
For no slip compensation or resonance smoothing. The Imax controller relates to voltage
instead of frequency.