Danfoss AK-PC 420 User Manual page 12

Operating status
The controller goes through some regulating situations where it is just waiting for the next
point of the regulation. To make these "why is nothing happening" situations visible, you can
see an operating status on the display. Push briefly (1s) the upper button. If there is a status
code, it will be shown on the display. The individual status codes have the following meanings
S10: Regulation stopped with the internal and external start/stop
S25: Manual regulation of outputs
Alarm messages
A11: No refrigerant has been selected (cf. o30)
A17: High Pc
A28, A29, A30: External alarm. Interrupted signal on input "DI1" /2/3
A34, A35, A36, A37, A46, A47: Fan alarm. Fan 1, 2, 3, 4, 5, 6
A45: Regulation stopped with setting or with external switch
A77: Interrupted signal on input "Flow switch" while pump 1 was operating
A78: Interrupted signal on input "Flow switch" while pump 2 was operating
A79: Interrupted signal on input "Flow switch" while pump 1 and 2 were operating
E1: Error in the controller
E2: Control signal outside the range (short-circuited/interrupted)
Safety functions
Criterion
Pc or S7 > Pc/S7 max (A30) - 3
Pc signal failure
S7 signal failure
Pc and S7 signal failure
Sc3 signal failure
S8 signal failure
12
Reference / control sensor
No change
S7 is used instead and the reference is lowered 5 K.
Pc is used instead and the reference is raised 5 K.
No change
The floating reference is removed, and regulation takes
place according to the set value for the reference – "r29".
No change
Manual RS8EL402 © Danfoss 03-2010
Ctrl state
(0 = regulation)
10
25
Alarms "Destinations"
A11 No RFG Sel
A17 Hi Pc alarm
A28 ...... A30 DI_ Alarm
A34 ...... A37, A46, A47 Fan_fault
A45 Stand by
A77 Pump 1 fault
A78 Pump 2 fault
A79 PMP1&2 fault
E1 Ctrl. fault
E2 Out of range
Capacity
100% capacity until the signal has fallen below the
limit for 60 seconds.
Normal regulation
Normal regulation
100% capacity
Normal regulation
When using app. 1-4, regulation continues without
S8 sensor.
When using app. 5-6, 100% capacity is cut in.
AK-PC 420