Siemens SED2 Operations Instructions download pdf (Page 71)

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Siemens Building Technologies SED2 variable speed drives CM1U5192en

HVAC Products Programming 01.2002

P2378

Staging frequency

This parameter is defined as a particular percentage of the maximum output frequency.

This determines the frequency used to switch on or off the relay (DOUT1 or DOUT2)

during staging or destaging.

See the diagram below.

5192D04en

PID Off

Relay On

PID On

PID Off Relay Off PID On

VSD freq.

Staging freq.

Max. freq.

Min. freq.

Staging freq.

Max. freq.

Min. freq.

Factory setting: = 50 % (defined as a percentage = 100%, at fmax = 50 Hz).

P0731 (DOUT1)

Function of the digital output 1 (relay 1)

Set parameter to 2379[0] (relay 1 to motor 1).

Factory setting: 52.3 = VSD fault enabled.

P0732 (DOUT2)

Function of the digital output 2 (relay 2)

Set parameter to 2379[1] (relay 2 to motor 2).

Factory setting: 52.2 = VSD in operation.

Complete parameter setting by changing over to automatic control.

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Siemens SED2 Operations Instructions Page 71