Danfoss AK-PC 551 User Manual

AK-PC 551 User Guide RS8GY302 © Danfoss 2015-06 9
Control status Read the status of the control circuit here e.g.:
• No comp. - No compressor capacity available
• Normal ctrl - Normal control
• Alarm Comp. - Cannot start compressor due to alarm condition
• ON timer - Cannot stop compressor due to ON timer restriction
• Start timer - Cannot start compressor due to Start timer restriction
• Normal ctrl - Normal control - no compressor staging
• Inj. On Delay - Waiting for injection on delay to expire
• Cascade
• 1st comp del - First compressor run timer
• Pump down - Last compressor running to pump down limit
• Sensor error - Emergency control due to sensor error
• Load shed - Load shedding function active
• Sd High - Capacity control in High Sd safety prevention mode
• Pc High - Capacity control in High Pc safety prevention mode
• Manual ctrl - Capacity control in manual mode
• Main switch OFF - OFF
Actuel zone You will be able to see how the regulation is in relation to the reference here:
P0 error: No regulation
- Zone: The desired pressure is below the reference value
NZ: The pressure is in place in relation to the reference value
+ Zone: The desired pressure is above the reference value
Control temp. 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 comp. The number of compressors in operation can be read here
PoA Pressure The measured pressure for the PoA pressure transmitter can be read here
ToA Saturated temp. The measured PoA pressure converted to temperature can be read here
MC PoA oset The size of a reference displacement on Po required from the system unit
(suction pressure optimisation function) can be read here
Pc Pressure The measured pressure for pressure transmitter Pc can be read here
Tc Saturated temp. The measured Pc pressure converted to temperature can be read here
Day / Night status The status of the day/night function can be read here
Load shed The status of the load shed function can be read here
Injection ON A The status of the injection ON signal sent to the evaporator controllers can be read here
MC Load Shedding The status of the load shed signal received from the system device can be read here
MC Night Setback The status of the night increase signal received from the system device can be read here
Control settings Regulation 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”, a forced capacity setting can subsequently be entered in %.
MAN / OFF / AUTO
Fac: AUTO
Min: 0 %
Max: 100%
Setpoint Enter the set point for the regulation (regulation reference = set point + dierent osets) here
An oset can originate from a night increase signal or from an override function on the
system device.
Min: -80°C (-1.0 bar)
Max: 30°C (50 bar)
Fac: -15°C (3.5 bar)
Neutral zone Set the neutral zone around the reference here. Also see the illustration on page 3.
Min: 0,1 K (0.1 bar)
Max: 20 K (5.0 bar)
Fac: 6 K (0.4 bar)
Night oset If necessary, set the value by which the reference will be raised at night.
Keep the setting at 0 if regulating with Po optimisation from a system device.
Min: -25 K (-5.0 bar)
Max: 25 K (5.0 bar)
Fac: 0 K (0.0 bar)
Max Reference Set the highest permissible regulation reference here
Min: -50°C (-1.0 bar)
Max: 80°C (50.0 bar)
Fac: 80°C (40.0 bar)
Min Reference Set the lowest permissible regulation reference here
Min: -80°C (-1.0 bar)
Max: 25°C (40.0 bar)
Fac: -80°C (-1.0 bar)
PI control selection Set how quickly the PI regulation must react here: 1 = slowly, 10 = very quickly.
(For “Custom” setting 0, the special settings options will open, i.e. Kp, Tn and time settings
around the neutral zone. These options are only for trained sta.)
Min: 0 (custom)
Max: 10
Fac: 5
Gain factor Kp The amplication factor, Kp (can only be seen and set when the previous menu is set to “0”)
Integration time Tn Integration time Tn (see above)
+ Zone rate of change Change coecient for + zone (see above)
- Zone rate of change Change coecient for - zone (see above)
First step runtime At start-up, the cooling system must have time to cool down before PI regulation takes over
the regulation role and can cut in the next compressor.
Set the time before the next compressor may be started here.
Min: 0 s
Max: 300 s
Fac: 120 s

Danfoss AK-PC 551 Specifications

General

Brand	Danfoss
Model	AK-PC 551
Category	Controller
Language	English