York AYK 550, User Manual

Page: 136 / 283

AYK550-UH User’s Manual 132
Start-Up
In an autochange, the Autochange function does all of the
following (see figure):
• Initiates a change when the running time, since the last
autochange, reaches 8118
AUTOCHNG INTERV
, and PFA
input is below limit 8119
AUTOCHNG LEVEL
.
• Stops the speed regulated motor.
• Switches off the contactor of the speed regulated motor.
• Increments the starting order counter, to change the
starting order for the motors.
• Identifies the next motor in line to be the speed regulated
motor.
• Switches off the above motor’s contactor, if the motor was
running. Any other running motors are not interrupted.
• Switches on the contactor of the new speed regulated
motor. The autochange switchgear connects this motor to
the AYK550 power output.
• Delays motor start for the time 8122 PFA
START DELA
y.
• Starts the speed regulated motor.
• Identifies the next constant speed motor in the rotation.
• Switches the above motor on, but only if the new speed
regulated motor had been running (as a constant speed
motor) – This step keeps an equal number of motors running before and after autochange.
• Continues with normal PFA operation.
Starting Order Counter
The operation of the starting-order counter:
• The relay output parameter definitions (1401…1403 and
1410…1412)) establish the initial motor sequence. (The lowest
parameter number with a value 31 (PFA) identifies the relay
connected to 1PFA, the first motor, and so on.)
• Initially, 1PFA = speed regulated motor, 2PFA = 1st auxiliary
motor, etc.
• The first autochange shifts the sequence to: 2PFA = speed
regulated motor, 3PFA = 1st auxiliary motor, …, 1PFA = last
auxiliary motor.
• The next autochange shifts the sequence again, and so on.
• If the autochange cannot start a needed motor because all
inactive motors are interlocked, the drive displays an alarm
(2051,
PFA INTERLOCK
).
• When AYK550 power supply is switched off, the counter
preserves the current Autochange rotation positions in permanent memory. When power is restored, the
Autochange rotation starts at the position stored in memory.
• If the PFA relay configuration is changed (or if the PFA enable value is changed), the rotation is reset. (See the
first bullet above.)
8120 INTERLOCKS 0…6 1 4 9
Defines operation of the Interlock function. When the Interlock function is enabled:
• An interlock is active when its command signal is absent.
• An interlock is inactive when its command signal is present.
• The AYK550 will not start if a start command occurs when the speed regulated motor’s interlock is active – the
control panel displays an alarm (2015,
PFA INTERLOCK
).
Group 81: PFA
Code Description Range Resolution Default S
t
P 8118
B
PID Output
P 8119
100%
P 8118
1PFA
2PFA
3PFA
4PFA
4PFA
2PFA
3PFA
A
P 8122
A = Area above 8119
AUTOCHNG LEVEL
–
autochange not allowed.
B = Autochange occurs.
1PFA, etc. = PID output associated with eAYK
motor.
No aux 1 aux
motor
2 aux
motors
motors
PID output
P 8119
100%
Output
f
MAX
Area
frequency
Autochange
is Allowed