Danfoss AK-PC 420 User Manual page 9

Reference displacement at max. signal (Ext. ref.)
Here the value is set by which the reference is to be displaced when the input signal
Ext. ref. is max. (10 V).
Reference displacement at min. signal (Ext. ref.)
Here the value is set by which the reference is to be displaced when the input signal
Ext. ref. is min. (0 V).
Correction of signal from S7
Compensation possibility due to long sensor cable
Correction of signal from S8
Compensation possibility due to long sensor cable
Condenser capacity
Definition of condenser and number of fans (may only be set if step-by-step
coupling is being run, i.e. "o61 Applic mode" is set at 1, 3 or 5).
Here you set how many fan steps are to be used for regulation (to max. 6).
1-6: All fans are connected with relays. Relay 1 is assigned fan 1, the next one number
2, etc.
7-10: Not used
11-16: Total number of fan relays (as 1-6), but here the starting sequence is altered
after each time all fans have been stopped.
NB
The controller must receive a signal of the status of each condenser step's safety
circuit. The signal must be connected to the associated DI input.
Definition of output voltage to valve/speed control
Output signal is 0-10 V or 10-0 V. The signal can be either linear or un-linear, so that it
can be adapted to the desired characteristics.
1: 0-10 V, linear
2: 10-0 V linear (not at shunt and fan speed)
3: 0-10 V, unlinear
4: 10-0 V unlinear (not at shunt and fan speed)
Regulation parameters
Proportional band xp for valve regulation (P = 100/Xp)
If the Xp value is increased, the regulation becomes steadier
I: Integration time Tn for valve regulation
If the Tn value is increased, the regulation becomes steadier
Manual control of condenser capacity
This sets the capacity that is to be cut in when switching to manual control.
Manual control
Manual control of the condenser capacity is enabled here.
When set to ON, the capacity that is specified in "n52" is cut in.
The setting will fall back to "Off" if the Main switch is set to Off or if there is a power
outage.
P: Proportional band xp for fan regulation (P = 100/Xp)
If the Xp value is increased, the regulation becomes steadier
I: Integration time Tn for fan regulation
If the Tn value is increased, the regulation becomes steadier
Capacity overlap between valve and fans
In valve regulation the first 50% of the capacity is controlled by the valve. When the
valve is fully open continues with fan cut-in.
The fans then take over.
If the fans are to start before the three-way valve is fully open, a value must be set
that is lower than 50%.
If the fans are only to start after the three-way valve is fully open, a value must be set
that is higher than 50%.
Alarm
The controller can give alarm in different situations. When there is an alarm the light-
emitting diodes (LED) will flash on the display and the alarm relay will cut in.
Pc max. (Alarm and safety function, see also page 18.)
Here you set when the alarm at too high condensing pressure is to enter into effect.
The value is set as an absolute value.
Alarm delay DI1 (an interrupted input will give alarm).
The time delay is set in minutes. At min. setting the alarm is cancelled.
AK-PC 420 Manual RS8EL402 © Danfoss 03-2010
r68 ExtRefMax
r69 ExtRefMin
r72 Adjust S7
r73 Adjust S8
Condenser config.
c29 Fan mode
c34 AO type
- - - - Cond Cap %
Read cut-in condenser capacity
n04 Valve Xp K
n05 Valve Tn s
n52 ConManCap%
n53 ConManCap
n60 Fan XP K
n61 Fan Tn s
n62 FanCap OFF %
Alarm settings
A30 Max. Pc. / S7
A27 DI1AlrmDelay
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