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131
Code Description
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
Parameter Setting
1
1
1
1
4
4
4
4
0
0
0
1
1
2
3
0
31 31 X X X X
31 31 31 X X X
x 31 31 X X X
X X X 31 X 31 1 X
31 31 X X X X 0** PFA
** = No auxiliary motors, but the autochange function is in use. Working as standard PID-control.
8118
AUTOCHNG INTERV
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
Autochange function.
• The drive always coasts to a stop when autochange is
performed.
• Autochange enabled requires parameter 8120
= value > 0.
0.0 =
– Disables the Autochange function.
NOT SEL
0.1...336 = The operating time interval (the time when the
start signal is on) between automatic motor changes.
Warning! When enabled, the Autochange function
requires the interlocks (8120 interlocks = value > 0)
enabled. During autochange the drive's power output is
interrupted and the drive coasts to stop, preventing
damage to the contacts.
8119
AUTOCHNG LEVEL
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.
Autochange Overview
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
Autochange is performed when:
• The running time since the previous autochange reaches the time set by 8118
• The PFA input is below the level set by this parameter, 8119
Note! The AYK550 always coasts to stop when autochange is performed.
Start-Up
Range
AYK550 Relay Assignment
1
1
8
Autochange Enabled
4
4
1
RO1
RO2 RO3
1
1
1
1
2
7
1 PFA
PFA
X
2 PFA
PFA
PFA
1 X
PFA
PFA
X
X
PFA
X
0.0...336.0 h
for an overview of the
AUTOCHNG LEVEL
0.0...100.0%
= value > 0.
INTERLOCKS
Group 81: PFA
Resolution
= value > 0).v
AUTOCHNG INTERV
RO4
RO5
RO6
X
X
X
X
X
X
X
X
X
PFA
X
PFA
X
X
X
0.1 h
AYK550
INTERLOCKS
0.1%
AUTOCHNG LEVEL
AYK550-UH User's Manual
Default
0.0
Relay Logic
PFA with Autochange mode
50.0%
AUTOCHNG INTERV
.
S
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