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Siemens Building Technologies SED2 variable speed drives CM1U5192en

HVAC Products Programming 01.2002

6.4 HVAC functions of the SED2

The functions listed below were implemented specifically in the SED2 for HVAC

applications.

6.4.1 PID controller

In order to achieve independent control within a stand-alone application by means of

the SED2 VSD, Siemens SBT implemented a proven PID controller. This controller

allows for temperature (LG-Ni 1000), pressure, and speed control.

The factory settings for the implemented PID parameters are designed for pressure

control.

For temperature or speed control, the controller's time constants must be adjusted to

the new control loop. See "Parameterizing the PID controller" below.

P2253

P2261

r2262

:setpointsource

: setpoint filter timeconstant

: filtered setpoint

P2264

P2267

P2268

P2270

P2271

r2272

P2274

: feedback source

: feedback threshold max

: feedback threshold min

: function sequence

: transducer type

: scaled feedback

: derivative time

: transient error signal

:Pgain

:Igain

: ramp-up/-down time of PID limit

: PID output upper limit

: PID output lower limit

: actuator opening time

: actuator closing time

53.A = PID output at lower limit

53.B = PID output at upper limit

r2294: PID output

PID

CONTROLLER

r2273

P2280

P2285

P2293

P2291

P2292

P2304

P2305

P0731/P0732 :

5192Z21en

Note:

The setpoint and the actual value signal are to be displayed as a percentage (%) or

absolute value. Make sure, however, that the two signals match each other.

P2201

Enter fixed setpoint

(or absolute value in %).

The setpoint is active if switching

command "ON" is sent to DIN1.

Analog input

Seethesectiononanaloginputsforthe

parameter settings.

P2253

Set to value 2224 (fixed PI setpoint).

P0701[0]

Enter value 16

(sets DIN1 to ON with fixed setpoint; see

section 6.3.1

Digital inputs).

P2253[0]

Set to 755

(setpoint is configured to AIN 1).

P0756[0]

Select the type of analog input 1 for the

setpoint. See section Analog inputs.

P0757[0] to P0760[0]

Set scaling of AIN 1.

P0756[1]

Define the type of analog input 2 for the actual value signal

(see section 6.3.2 Analog inputs).

Parameterizing the PID

controller

(commissioning)

Fixed setpoint

External setpoint

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 125 126

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