YASKAWA Varispeed-505WII - FLIMIT (Forward Limit Value Adjustment); RLIMIT (Reverse Limit Value Adjustment); PSB (Phase Shifter Operating Point Adjustment); CEMF (Counter Electromotive Force Compensation)

6 . If the speed exceeds the desired speed, turn
NMAX
clockwise to decrease
the speed .
FLIMIT (Forward limit value adjustment)
RLIMIT (Reverse limit value adjustment)
1 . Current limitation (Speed control)
Slide the control method selector switch (1SW) on
the control circuit board to N . When the
voltages
at CH7 (forward)
and CH6 (reverse) are +3 V,
100% current limit value is obtained
. Current limit
value can be set within the range of 0% to 250%
by
F LIMIT and R LIMIT .
2 . Speed limitation (Current control)
Slide
the control method selector switch (1SW)
on
the control circuit board to I . When the voltages
at CH 7 (forward)
and
CH 6 (reverse) are +6 V,
100% speed limit value is obtained . Speed limit
value can be set within the range of 0% to 250%
by F LIMIT and R LIMIT .
PSB (Phase shifter operating point adjustment)
PSB sets the phase shifter operating point .
1 . When the current controller (ACR) is inte-
gral-controlled
Connect the
plug
selector F on the control
circuit
board at Fl . Turn PSB fully counterclockwise .
2 . When the current controller (ACR) is ratio-
controlled
Connect the plug selector F on the control circuit
board at F2 . Turn PSB clockwise gradually with
reference current at 0 V (0 V at CH 2) , and set
at the position
where main circuit current
is
ready to start .
CEMF (Counter electromotive force compensation)
Current loop is vulnerable
to
counter
electro-
motive force . In order to obtain optimum per-
formance, a compensating electromotive
force has
to be biased on the phase shifter, depending on
the control mode .
1 .
When the current controller (ACR) is ratio-
controlled
Adjust CEMF,
observing the motor acceleration
current with a synchroscope . Turn CEMF fully
counterclockwise, and turn CEMF clockwise
gradually until optimum value shown in Fig . 10
is
obtained .
2 . When the current controller
(ACR)
is inte-
gral-controlled
MOTOR
ACCELERATION
CUR 1tENT
Field Current Adjustment
Fig .
10 CEMF
Adjustment
CEMF compensation reduces the loss
time due to
Forward/Reverse selection to as the same level
as
the
integral control
of ACR . Turn CEMF fully
counterclockwise, and during motor acceleration
by current limit gradually turn it clockwise until
the voltage at CH2 on the control
circuit board
stabilizes .
Field current adjustment
is required for
checking
the setting
at the factory or for fine
adjustment .
To change
the setting, selection of
resistors (1FB R to
4FB R) on
the control circuit board
is required .
1 . For constant
field current
a .
Connect a DC ammeter
to the field circuit .
b . Adjust
so that the ammeter indicates the
rated field
current with IREF on the control
circuit board . (Refer to the
test report or
nameplate
data .)
2 . For
field weakening control
SYNCHROSCOPESCREEN
ADJUST THE SWEEP SPEED
ADAPTED TO THE MOTOR
ACCELERAITON TIME TO
BRING THE CURVES TO A
CONVENIENT POSITION .
Field weakening control is made for the VS-505WII
combined
with
field weakening control unit type
JGSM-51-
D .
a . Connect DC ammeter to the field circuit and
DC voltmeter to output terminals P, N .
b . Turn IREF on the control circuit
board and
FORCE
FLD andV LIMIT of field controller
fully counterclockwise .
c . Seat the minimum field weakening current
by
IREF . In this case, set the current at 80% field
weakening current at maximum speed
. (See the
test report .)
d . Set the rated field current (field intensifying
by FORCE FLD .

(See the test report
or name-
plate data .)
e . Alter the motor
starts, gradual increasing
the speed reference increases the
voltage across
P and N and governs it at some value .

Turn V
LIMIT clockwise gradually so
that the governed
value is the rated voltage .