Siemens SED2 Commissioning Manual

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Siemens Building Technologies Commissioning Guide CM1G5192en
HVAC Products 7 Application examples 26.02.2003
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 Parameter function Function selection
P0501(0) 29 Type of sensor Set input scale to –50…150 °C
P0700(0) 2 Selection of command source Set commands from terminals
P0701(0) 16 Function of digital input 1 in “Auto”
mode
Set DI-1 for fixed frequency SP + ON
P0702(0) 27 Function of digital input 2 in “Auto”
mode
Set DI-2 for PID enable
P0704(0) 16 Function of digital input 4 in “Auto”
mode
Set DI-4 for fixed frequency SP + ON
P0756(0) 5 Analog input Sets AI-1 To LG-Ni 1000
P1000(0) 3 Selection of frequency setpoint Setpoint by fixed frequency
P1004 50 Selection fixed frequency setpoint (Hz) Fixed frequency DI-4 = 50Hz
P1080 15 Motor minimum frequency Minimum frequency
P2201 27 Fixed PID setpoint Fixed setpoint in Celsius for PID (DI-1)
P2253 2224 PID setpoint PID setpoint source
P2264 755.0 PID feedback Sets PID feedback source to AI-1
P2274 0 PID derivative action time Derivative action time
P2280 5
PID proportional gain
Proportional band
P2285 20
PID integral action time
Integral action time
P2306 0 PID acting direction Direct acting loop
P2390 35
Hibernation frequency
Hibernation setpoint [%]
P2391 90
Hibernation timer
Hibernation timer in seconds
P2392 -2
Restart PID controller deviation
Restart – PID error
r2262 27
Filtered PID setpoint
Display actual setpoint in C
r2272 28.2
PID scaled feedback
Display actual condenser temperature
r2273 -1.2 PID error Display actual PID error in %
r2294 70 PID output Display actual VSD output in %

Siemens SED2 Specifications

General

Brand	Siemens
Model	SED2
Category	DC Drives
Language	English