Program features 157
7. The drive waits for 8122 PFC START DELAY to ensure that the contactor (RO 2)
has stabilized.
8. After delay 8122, 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 9902 APPLIC MACRO to
value 15 (SPFC CONTROL).
2. Set PFC reference steps (parameters 8103…8105) if needed.
3. Set PFC start and stop frequencies (parameters 8109…8114).
4. Set PFC auxiliary motor start and stop delays (parameters 8115…8116).
5. Set the number of auxiliary motors (parameter 8117).
6. Enable Autochange (parameter 8118). 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 8119).
8. Parameterize Interlocks (parameter 8120).
9. Set Bypass function if needed (parameter 8121).
10. Set PFC start delay (parameter 8122).
11. Enable SPFC. Depending on the application, set parameter 8123 PFC ENABLE
to value 2 (SPFC ACTIVE) or value 3 (SPFC + AUTOCHANGE).
Value 1 (ACTIVE): enables normal PFC functionality.
Value 2 (SPFC ACTIVE): enables SPFC function with auxiliary motors running.
Value 3 (SPFC + AUTOCHANGE): enables SPFC function only when auxiliary
motors are not running
12. Set PFC acceleration and deceleration times if needed (parameters 8124…8125).
13. Autochange enable with a timed function is ignored (parameter 8126).
14. Set relays in group 14 RELAY OUTPUTS. (Transistor output TO [parameter 1805
DO SIGNAL] 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 8117] + 1 [speed
regulated motor] when SPFC is used).
15. Set number of PFC controlled motors in parameter 8127 (= number of PFC relays
in group 14 RELAY OUTPUTS).
16. Also set other needed motor dependent parameters, eg 2
007 MINIMUM FREQ,
2008 MAXIMUM FREQ and 2605 U/F RATIO.
PFC control and SPFC control default settings have differences in acceleration time
(2202), deceleration time (2203) and auxiliary motor stop delay (8116) parameters.
See also section SPFC control macro on page 111.
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