Siemens bt300 Operator's Manual page 37

Structure Parameter
P3.1.2.5 Preheat Function
P3.1.2.6 Preheat TempLimit
P3.1.2.7 Preheat Current
P3.1.2.9 U/f Ratio Select
P3.1.2.15 Over Volt Contr
P3.1.2.16 Under Volt Contr
P3.1.2.17 StatorVoltAdjust
P3.1.2.18 Energy Optimization
P3.1.2.19 Flying Start Options
U/f ratio selection (P3.1.2.9)
Selection Selection Name
Number
0 Linear
1 Squared
Siemens Industry, Inc.
Building Technologies
Unit Min Max
Not Used Temp Limit
ºF -20 80
A 0 .5*IL
Linear Squared
Disabled Enabled
Disabled Enabled
% 50 150
Disabled Enabled
Both FreqRefDirection
Directions
Table 16: Ratio Selections.
The voltage of the motor changes linearly as a function of output frequency from zero frequency voltage
(P3.1.2.4) to the field weakening point (FWP) voltage at FWP frequency. This default setting should be
used if there is no special need for another setting.
The voltage of the motor changes from zero point voltage (P3.1.2.4) following a squared curve form from
zero to the field weakening point. The motor runs under-magnetized below the field weakening point and
produces less torque. Squared U/f ratio can be used in applications where torque demand is proportional to
the square of the speed (for example, in centrifugal fans and pumps).
Siemens BT300 HVAC Drive
Chapter 4 - Parameters and Menu Structure
Default ID
Not Used 1225 Defines the use of the PreHeat Function
(P3.1.2.5).
0 = Not Used
1 = Always in Stop State
2 = Controlled by Digital Input
3 = Temp Limit (based on Heat Sink)
0 1226 Defines the temperature the heat sink
falls below for pre-heating the motor and
drive when PreHeat Function (P3.1.2.5)
is set to Temp Limit.
Varies 1227 Defines the DC current to be use for pre-
heating the motor and drive when
PreHeat Function (P3.1.2.5) is set to
Stop State.
Varies 108 Type of U/F curve between zero
frequency and the field weakening point.
0 = Linear
1 = Squared
Enabled 607 Enable parameter for the over voltage
controller. When enabled, the drive
acceleration and speed can be modified
by the controller to prevent the drive
from tripping.
Enabled 608 Enable parameter for the over voltage
controller. When enabled, the drive
acceleration and speed can be modified
by the controller to prevent the drive
from tripping.
100 659 Parameter for adjusting stator voltage in
permanent magnet motors.
Disabled 666 Enable parameter to have the drive
search for the minimum motor current in
order to save energy and to lower the
motor noise.
Both 1590 0 = Shaft direction is searched in both
Directions directions.
1 = Shaft direction is searched in
setpoint direction only.
Description
Parameters (M3)
Description
37 | 180
DPD01809
2016-06-07