Danfoss AK-PC 351 User Manual page 12

Condenser
Control status
Control status
Control temp./press
Reference
Running capacity
Requested capacity
No. of running fans
Tc Saturated temp.
Pc Pressure
S7 Media
Sc3 air on cond.
HP safety switch
Day / Night status
Control settings
Control mode
Setpoint
Sc3 offset
Min. reference
Max. reference
Gain factor Kp
Integration time Tn
Fan configuration
Control sensor
Pc sensor max range
Pc sensor min range
Reference mode
12
Regulation 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
The current value of the regulation sensor can be read here
The total regulation reference can be read here
Here the connected capacity can be read as a % of total capacity
Here the preferred connected capacity can be read as a % of total capacity
The number of fans in operation can be read here
The measured Pc pressure converted to temperature can be read here
The measured pressure for pressure transmitter Pc can be read here
Here the measured media temperature with sensor S7 can be read (only if S7 has been
selected as the regulation sensor during "Fan configuration")
The measured outdoor temperature with sensor Sc3 can be read here
The status of the HP safety switch can be read here
Here the status of the day /night function can be read
Control settings
Regulation type
The regulation is normally set to "Auto", but it can be changed to "Off" or "Manual".
When setting to "Manual", capacity can then be forced set in %.
Enter the set point for the condenser regulation here.
Also set a value if regulating with a fluid reference (set point value used in the event of an
outside temperature sensor error).
Temperature offset for regulation with fluid reference.
Regulation reference = Sc3 measurement + Sc3 offset
Set the lowest permissible regulation reference here
Set the highest permissible regulation reference here
Amplification factor for PI regulation
If the Kp value is lowered, regulation runs more smoothly
Integration time for PI regulation
If the Tn value is increased, regulation will run more smoothly
Configuration of fans
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)
Pressure transmitter working range
Set pressure transmitters upper value. Set ini relative pressure.
Pressure transmitter working range
Set pressure transmitters lower value.. Set ini relative pressure
Set the reference for regulation here
• Fixed reference; the reference here will be the defined set point
• Variable reference; the reference here will follow the outside temperature, which is meas-
ured with Sc3.
User Guide RS8GZ302 © Danfoss 2015-06
MAN / OFF / AUTO
Fac: AUTO
Min: 0 %
Max: 100%
Min: -25°C (-1.0 bar)
Max: 90°C (159 bar)
Fac: 35°C (15.0 bar)
Min: 0 K
Max: 20 K
Fac: 6 K
Min: -25°C (-1.0 bar)
Max: 100°C (159 bar)
Fac: 10°C (5.0 bar)
Min: -25°C (-1.0 bar)
Max: 100°C (159 bar)
Fac: 50°C (35.0 bar)
Min: 1
Max: 30
Fac: 10
Min: 30 s
Max: 240 s
Fac: 180 s
AI-demand
Pc / S7
Fac: Pc
Min: -1 bar
Max: 159 bar
Fac: 34 bar
Min: -1 bar
Max: 159 bar
Fac: -1 bar
AI-demand
Setpoint / Floating
Fac: Setpoint
AK-PC 351