12
Manual RS8EL402 © Danfoss 03-2010
AK-PC
420
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
Ctrl state
(0 = regulation)
S10: Regulation stopped with the internal and external start/stop
10
S25: Manual regulation of outputs
25
Alarm messages
Alarms "Destinations"
A11: No refrigerant has been selected (cf. o30)
A11 No RFG Sel
A17: High Pc
A17 Hi Pc alarm
A28, A29, A30: External alarm. Interrupted signal on input "DI1" /2/3
A28 ...... A30 DI_ Alarm
A34, A35, A36, A37, A46, A47: Fan alarm. Fan 1, 2, 3, 4, 5, 6
A34 ...... A37, A46, A47 Fan_fault
A45: Regulation stopped with setting or with external switch
A45 Stand by
A77: Interrupted signal on input "Flow switch" while pump 1 was operating
A77 Pump 1 fault
A78: Interrupted signal on input "Flow switch" while pump 2 was operating
A78 Pump 2 fault
A79: Interrupted signal on input "Flow switch" while pump 1 and 2 were operating
A79 PMP1&2 fault
E1: Error in the controller
E1 Ctrl. fault
E2: Control signal outside the range (short-circuited/interrupted)
E2 Out of range
Safety functions
Criterion
Reference / control sensor
Capacity
Pc or S7 > Pc/S7 max (A30) - 3
No change
100% capacity until the signal has fallen below the
limit for 60 seconds.
Pc signal failure
S7 is used instead and the reference is lowered 5 K.
Normal regulation
S7 signal failure
Pc is used instead and the reference is raised 5 K.
Normal regulation
Pc and S7 signal failure
No change
100% capacity
Sc3 signal failure
The floating reference is removed, and regulation takes
place according to the set value for the reference – “r29”.
Normal regulation
S8 signal failure
No change
When using app. 1-4, regulation continues without
S8 sensor.
When using app. 5-6, 100% capacity is cut in.
