Danfoss AK-PC 351 - Condenser Operation and Control; Condenser Status and Control Modes; Condenser PI Regulation Tuning; Condenser Fan Configuration

12 User Guide RS8GZ302 © Danfoss 2015-06 AK-PC 351
Condenser
Control status Regulation status
Control status Here you can read the status of the condenser circuit, e.g.:
• Main switch = OFF
• Capacity control is ready
• Capacity control is in normal run mode
• Capacity control is set in manual control mode
• Capacity forced to 100% due to High Pc/High Sd prevention functions
• Capacity forced to 100% due to external HP switch/HP safety/Sd safety limit violation
Control temp./press The current value of the regulation sensor can be read here
Reference The total regulation reference can be read here
Running capacity Here the connected capacity can be read as a % of total capacity
Requested capacity Here the preferred connected capacity can be read as a % of total capacity
No. of running fans The number of fans in operation can be read here
Tc Saturated temp. The measured Pc pressure converted to temperature can be read here
Pc Pressure The measured pressure for pressure transmitter Pc can be read here
S7 Media Here the measured media temperature with sensor S7 can be read (only if S7 has been
selected as the regulation sensor during “Fan conguration”)
Sc3 air on cond. The measured outdoor temperature with sensor Sc3 can be read here
HP safety switch The status of the HP safety switch can be read here
Day / Night status Here the status of the day /night function can be read
Control settings Control settings
Control mode Regulation type
The regulation is normally set to “Auto”, but it can be changed to “O” or “Manual”.
When setting to “Manual”, capacity can then be forced set in %.
MAN / OFF / AUTO
Fac: AUTO
Min: 0 %
Max: 100%
Setpoint Enter the set point for the condenser regulation here.
Also set a value if regulating with a uid reference (set point value used in the event of an
outside temperature sensor error).
Min: -25°C (-1.0 bar)
Max: 90°C (159 bar)
Fac: 35°C (15.0 bar)
Sc3 oset Temperature oset for regulation with uid reference.
Regulation reference = Sc3 measurement + Sc3 oset
Min: 0 K
Max: 20 K
Fac: 6 K
Min. reference Set the lowest permissible regulation reference here
Min: -25°C (-1.0 bar)
Max: 100°C (159 bar)
Fac: 10°C (5.0 bar)
Max. reference Set the highest permissible regulation reference here
Min: -25°C (-1.0 bar)
Max: 100°C (159 bar)
Fac: 50°C (35.0 bar)
Gain factor Kp Amplication factor for PI regulation
If the Kp value is lowered, regulation runs more smoothly
Min: 1
Max: 30
Fac: 10
Integration time Tn Integration time for PI regulation
If the Tn value is increased, regulation will run more smoothly
Min: 30 s
Max: 240 s
Fac: 180 s
Fan conguration Conguration of fans
Control sensor Select the regulating sensor for the condensor circuit:
• Pressure transmitter Po - Ratiometric (AKS 32R), 1-5V (AKS 32), 0-20mA, 4-20mA (AKS 33)
• Temperature sensor S7 (Pt 1000 ohm)
AI-demand
Pc / S7
Fac: Pc
Pc sensor max range Pressure transmitter working range
Set pressure transmitters upper value. Set ini relative pressure.
Min: -1 bar
Max: 159 bar
Fac: 34 bar
Pc sensor min range Pressure transmitter working range
Set pressure transmitters lower value.. Set ini relative pressure
Min: -1 bar
Max: 159 bar
Fac: -1 bar
Reference mode Set the reference for regulation here
• Fixed reference; the reference here will be the dened set point
• Variable reference; the reference here will follow the outside temperature, which is meas-
ured with Sc3.
AI-demand
Setpoint / Floating
Fac: Setpoint