Siemens SED2 series Operating Instructions Manual page 71

Siemens Building Technologies
HVAC Products
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.
f
Max. freq.
Staging freq.
Min. freq.
f
Max. freq.
Staging 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.
SED2 variable speed drives
Programming
VSD freq.
PID Off Relay On PID On
VSD freq.
PID Off Relay Off PID On
t
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CM1U5192en
01.2002