Pressure Loss Compensation (M3.12.6); Pid Control Sequence Details - Siemens bt300 Operator's Manual

Chapter 4 - Parameters and Menu Structure
Parameters (M3)

Pressure Loss Compensation (M3.12.6)

Structure Parameter
P3.12.6.1 Enable SP 1
P3.12.6.2 SP 1 Max Comp.
P3.12.6.3 Enable SP 2
P3.12.6.4 SP 2 Max Comp.

PID Control Sequence Details

Dead band hysteresis (P3.12.1.9) and Dead band delay (P3.12.1.10)
The PID controller output is locked if the actual value stays within the dead band area around the reference for a
predefined time. This function prevents unnecessary movement and wear on actuators and valves.
92 | 180
Siemens Industry, Inc.
Building Technologies
Table 63: Pressure Loss Compensation.
Unit Min
Disabled Enabled
% -214748.36 214748.36
Varies Disabled Enabled
% -214748.36 214748.36
Siemens BT300 HVAC Drive
Max Default ID
Disabled 1189
0 1190
Disabled 1191
0 1192
Description
Enables the drive to raise or lower
the setpoint depending on output
frequency. SP 1 Max Comp.
(P3.12.6.2) is the compensation at
maximum frequency. This can be
used with incorrectly placed
sensors. For example, if a pressure
sensor is placed far away from the
wanted pressure and the error in
the measurement is in proportion to
the flow/output frequency.
0 = Disabled
1 = Enabled
Value added proportionally to the
frequency.
Setpoint Compensation = SP 1 Max
Comp. (P3.12.6.2) * (Output
Frequency [M2.2.1]) - Min
Frequency [P3.3.1])/(Max
Frequency [P3.3.2] - Min Frequency
[P3.3.1])
Enables the drive to raise or lower
the setpoint depending on output
frequency. SP 2 Max Comp.
(P3.12.6.2) is the compensation at
maximum frequency. This can be
used with incorrectly placed
sensors. For example, if a pressure
sensor is placed far away from the
wanted pressure and the error in
the measurement is in proportion to
the flow/output frequency.
0 = Disabled
1 = Enabled
Value added proportionally to the
frequency.
Setpoint Compensation = SP 2 Max
Comp. (P3.12.6.4) * (Output
Frequency [M2.2.1] - Min
Frequency [P3.3.1] / Max
Frequency [P3.3.2] - Min Frequency
[P3.3.1].)
DPD01809
2016-06-07