Parameter Changes - Siemens sed2 Commissioning Manual

Notes: When the chiller interlock latches, the VSD will start and maintain the temperature setpoint (P2201). If the
output of the VSD drops below the hibernation setpoint P2390, then, after the timeout period (P2391), the
VSD will drop from the minimum motor frequency (P1080) to zero, and turn off when the temperature ex-
ceeds the setpoint by 2 °C.
P2392: VSD will restart and ramp up to maintain the setpoint once more. This feature allows the minimum
motor frequency to be set to protect the motor from overheating and stalling, while allowing the motor to
turn off when not needed to prevent overcooling of the chiller condenser water.

7.7.1 Parameter changes

Start with quick commissioning according to application example 1
Par. no. Value
P0501(0) 29
P0700(0) 2
P0701(0) 16
P0702(0) 27
P0704(0) 16
P0756(0) 5
P1000(0) 3
P1004 50
P1080 15
P2201 27
P2253 2224
P2264 755.0
P2274 0
P2280 5
P2285 20
P2306 0
P2390 35
P2391 90
P2392 -2
r2262 27
r2272 28.2
r2273 -1.2
r2294 70
38/80
Siemens Building Technologies
HVAC Products
Parameter function
Type of sensor
Selection of command source
Function of digital input 1 in "Auto"
mode
Function of digital input 2 in "Auto"
mode
Function of digital input 4 in "Auto"
mode
Analog input
Selection of frequency setpoint
Selection fixed frequency setpoint (Hz) Fixed frequency DI-4 = 50Hz
Motor minimum frequency
Fixed PID setpoint
PID setpoint
PID feedback
PID derivative action time
PID proportional gain
PID integral action time
PID acting direction
Hibernation frequency
Hibernation timer
Restart PID controller deviation
Filtered PID setpoint
PID scaled feedback
PID error
PID output
Commissioning Guide
7 Application examples
Function selection
Set input scale to –50...150 °C
Set commands from terminals
Set DI-1 for fixed frequency SP + ON
Set DI-2 for PID enable
Set DI-4 for fixed frequency SP + ON
Sets AI-1 To LG-Ni 1000
Setpoint by fixed frequency
Minimum frequency
Fixed setpoint in Celsius for PID (DI-1)
PID setpoint source
Sets PID feedback source to AI-1
Derivative action time
Proportional band
Integral action time
Direct acting loop
Hibernation setpoint [%]
Hibernation timer in seconds
Restart – PID error
Display actual setpoint in C
Display actual condenser temperature
Display actual PID error in %
Display actual VSD output in %
CM1G5192en
26.02.2003