YORK, A Johnson Controls Company
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The table below shows the AYK550 PFA motor assignments for some typical settings in the Relay Output parameters
(1401…1403 and 1410…1412), where the settings are either =31 (PFA), or =X (anything but 31), and where the
Autochange function is enabled (8118
AUTOCHNG INTERV
= value > 0).v
** = No auxiliary motors, but the autochange function is in use. Working as standard PID-control.
8118
'&*'!
>QQ^>9
> 9
>
9
Controls operation of the Autochange function and sets the
interval between changes.
• The Autochange time interval only applies to the time when
the speed regulated motor is running.
• See parameter 8119
AUTOCHNG LEVEL
for an overview of the
Autochange function.
• The drive always coasts to a stop when autochange is
performed.
• Autochange enabled requires parameter 8120
INTERLOCKS
=
value > 0.
0.0 =
NOT SEL
– Disables the Autochange function.
0.1…336 = The operating time interval (the time when the start
signal is on) between automatic motor changes.
6 7869 ;3B,9,2=9 74 =,2 <
,9 ,2=WcF ,2=Wx{ ;3>
7,2=9 7,93$2?2,,
,,3 3,93=2,,2,2B , 7
3@7,2,9=2 ,=,>
8119
'&""
>>q
>q
>q
Sets an upper limit, as a percent of output capacity, for the autochange logic. When the output from the PID/PFA
control block exceeds this limit, autochange is prevented. For example, use this parameter to deny autochange when
the Pump-Fan system is operating near maximum capacity.
,2=9 7&?
The purpose of the autochange operation is to equalize duty time between multiple motors used in a system. At each
autochange operation:
• A different motor takes a turn connected to the AYK550 output – the speed regulated motor.
• The starting order of the other motors rotates.
The Autochange function requires:
• External switchgear for changing the dive’s output power connections.
• Parameter 8120
INTERLOCKS
= value > 0.
Autochange is performed when:
• The running time since the previous autochange reaches the time set by 8118
AUTOCHNG INTERV
• The PFA input is below the level set by this parameter, 8119
AUTOCHNG LEVEL
.
2,8
The AYK550 always coasts to stop when autochange is performed.
2c_%\
23 =,2
! 7
!2,2
4,
#
%@,#,, 7
!+7 @ ,
]
]
F
]
Q
]
]
]
F
c
g
,2=9 7 ;3
!& !&F !&Q !&] !& !&^
31 31 X X X X 1 PFA
PFA
X
X
X
X
31 31 31 X X X 2 PFA
PFA
PFA
X
X
X
x 31
31
X
X
X
1 X PFA
PFA
X X X
X X X 31 X 31 1 X
X
X
PFA
X
PFA
31 31 X
X
X
X 0** PFA
PFA
X
X
X
X
PFA with Autochange mode
AYK550
Relay Logic
Summary of Contents for York AYK550
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