Chapter 6 – Parameters
6-50 ACH 500 Programming Manual
13 LOW FREQ 2
0 – 500 Hz (ACH 501)
0 – 120 Hz (ACH 502)
Output frequency that the ACH 500 will go to after the second lag motor is
started. If the output frequency goes below this limit by 1 Hz, the lag motor
will stop.
14 LOW FREQ 3
0 – 500 Hz (ACH 501)
0 – 120 Hz (ACH 502)
Output frequency that the ACH 500 will go to after the third lag motor is
started. If the output frequency goes below this limit by 1 Hz, the lag motor
will stop.
15 LAG MOT START DLY
0 – 3600s
Start delay for lag motors to prevent the lag motor from starting due to a
momentary crossing of the start limit. The frequency must remain above the
start limit for the period of time set by this parameter before the lag motor will
start.
16 LAG MOT STOP DLY
0 – 3600s
Stop delay for lag motors to prevent the lag motor from stopping due to a
momentary crossing of the stop limit. The frequency must remain below the
stop limit for the period of time set by this parameter before the lag motor will
stop.
17 NBR OF LAG
MOTORS
0 – 3
Number of lag motors in the system. Requires I/O Extension Board to use
third motor.
18 ALTERNATION
INTERV.
0 min – 168 hrs
Time interval for changing the sequencing order of the motors. Alternation
only occurs when the actual signal goes below the level set by Parameter
40.2.19 (Alternation Level). Setting the value to 00h 00min disables the
alternation function. This must be done with the drive stopped. The interval
time only counts the time that the ACS 500 is commanded to run.
19 ALTERNATION
LEVEL
0 – 100%
Actual value level below which the alternation takes place. When the time set
by Parameter 40.2.18 (Alternation Interv.) is exceeded and the level goes
below the level set by this parameter, the order of the lag motors will change.
With this parameter set to 0, automatic alternation only takes place when the
ACH 500 is stopped (normal or “sleep”).
The alternation level is in relation to the set maximum frequency and to the
capacity of the system such that, if a value of the parameter is 45% and the
system has only two motors, the automatic exchange takes place at the
frequency of 0.45/50 x f
max
.
If there are more motors connected, the percentage value corresponding to the
set maximum frequency is:
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