YASKAWA Varispeed-505WII - Adjustment Procedure; NMAX (Speed Feedback Adjustment)

TEST
RUN (Cont'd)

Adjustment Procedure
Fig . 9 Control
Circuit Check Terminals
N MAX (Speed feedback adjustment)
Table 7 Control
Board Check Terminals
To adjust the DC
motor speed exactly to the
reference speed, proceed as follows .
1 . Prepare the
tachometer having the required
accuracy .
2 . Operate the
DC motor at no load (or
less
variation)
.
3 . Measure the
speed reference voltage
with a
voltmeter . Correct the
voltage to that of desired
motor speed .
4 . Measure the motor
speed with a tachometer
.
5 .
If the speed does not
reach the desired speed,
turn NMAX counterclockwise
to increase the
speed .
Signal Name
Check
Terminals
Normal Value
CH22 OV (SG )
Stable
power supply
CH24 +15 V
CH25 -15 V
CH19 +24 V
CH20 -24 V
Allowable voltage
Unstable power supply
CH23
+24
V (Pulse amplifier
supply)
function range :
±20%
CH4 :6 V/100%
com mand (8 Forward, (+
Reverse)
Speed reference
CH5 ±6 V/100%
com mand ((D Forward,
(DReverse)
Speed feedback
CH3
;6 V / 100% spe ed
(0
Forward,
+
Reverse)
Forward CH9
Current command
Reverse
CH8
-3
V/100% command
Current limit
Forward
CH7 +3 V/100% current limit
(Speed limit)
Reverse CH6
(+6
V/100% speed limit)
Main Current
feedback
CH18 +3 VI100%
current
Circuit
Power
Current limiter output
CH2
. -1 V at gate
ock bl
Approx
0 t o
+6 V when controlling
Phase shifter input
CH16
Approx . +5 .5 V at 60 Hz,
+6
.5 V at 50 Hz at gate
block .
+1 to +5
.5 V at 60 Hz,
+1 to +6
.5 V at 50 Hz
when controlling .
Counter
electromotive force input
CH1 0 - ±5 V
Overload
detection start point
CH21 110% (Approx : -1 .65
V)
Zero-current detection
CH15
0
V
at load current conduction, approx .
+12 V at
0 A of load current .
Pulse
amplifier power
Forward
C1112
0
V at reverse opera-
tion .
Approx
.
+24 V at forward
operation .
supply
Reverse
CH13
0 V at
fozwaz~d opera-
tion .
Approx . +24 V at
reverse
operation .
Gate block (at failure)
CH14 0
V normal, : !pprox . -12 V at gate bloc
k .
u U
u
Phase shifter
synchronization v
4/_~s
ar
U, V, W : Main circuit
power supply
w
w
11 y
input power supply .
Current command
CH11
Voltage according
to ~ -6 V/5 A
Field
Current
feedback
CH17
field current .
+3 V/5 A
Power
Phase shifter input
CH10
Approx . +5
V at 60 Hz,
+6 V at 50
Hz at field
block .
+1
to +5 V at 60 Hz,
+1 to +6
V
at 50 Hz
when controlling
.