Program features 157
7. The drive waits for
to ensure that the contactor (RO 2)
has stabilized.
8. After delay
, the drive starts modulating from zero speed regulating the
speed of motor 2. RO 1 is closed and motor 1 is connected directly on-line as an
auxiliary motor.
How to parameterize SPFC control
1. Select the SPFC control macro by setting parameter
to
value 15 (
2. Set PFC reference steps (parameters
) if needed.
3. Set PFC start and stop frequencies (parameters
…
).
4. Set PFC auxiliary motor start and stop delays (parameters
).
5. Set the number of auxiliary motors (parameter
).
6. Enable Autochange (parameter
). In SPFC control, the parameter only allows
SPFC to use PFC's alternation switchgear box. It is not used as the operating
time interval between the automatic motor changes as in normal PFC application.
7. Autochange level is ignored (parameter
).
8. Parameterize Interlocks (parameter
9. Set Bypass function if needed (parameter
).
10. Set PFC start delay (parameter
11. Enable SPFC. Depending on the application, set parameter
to value 2 (
) or value 3 (
).
Value 1 (
): enables normal PFC functionality.
Value 2 (
): enables SPFC function with auxiliary motors running.
Value 3 (
): enables SPFC function only when auxiliary
motors are not running
12. Set PFC acceleration and deceleration times if needed (parameters
…
13. Autochange enable with a timed function is ignored (parameter
14. Set relays in group
. (Transistor output TO [parameter
] can be used as an additional relay output, if needed.) Both PFC and
SPFC use these relays. You must set at least as many relays as there are motors
set for SPFC (= the number of auxiliary motors [parameter
] + 1 [speed
regulated motor] when SPFC is used).
15. Set number of PFC controlled motors in parameter
(= number of PFC relays
in group
).
16. Also set other needed motor dependent parameters, eg
and
PFC control and SPFC control default settings have differences in acceleration time
(
), deceleration time (
) and auxiliary motor stop delay (
) parameters.
See also section
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