Mitsubishi Electronics FR-A500 Manuale Utente
217
6
Measuring Points and Instruments
Note:
1.
A tester cannot measure accurately.
2.
When Pr. 195 "A, B, C terminal function selection" setting is positive logic.
3.
When the carrier frequency exceeds 5kHz, do not use the instrument since using it may increase eddy-current losses
produced in metal parts inside the instrument, leading to burnout.
In this case, use an approximate effective value type instrument.
produced in metal parts inside the instrument, leading to burnout.
In this case, use an approximate effective value type instrument.
* Values in parentheses indicate those for 400V class.
Item
Measuring Point
Measuring Instrument
Remarks
(Reference Measured Value) *
Power supply voltage V
1
Across R-S, S-T and T-R
Moving-iron type AC voltmeter
Power supply side
current I
current I
1
R, S and T line currents
Moving-iron type AC ammeter
Power supply side power
P
P
1
At R, S and T, and across R-S,
S-T and T-R
S-T and T-R
Electrodynamic type single-
phase wattmeter
phase wattmeter
P
1
= W
11
+ W
12
+ W
13
(3-wattmeter method)
Power supply side power
factor Pf
factor Pf
1
Calculate after measuring power supply voltage, power supply side current and power supply side power.
Output side voltage V
2
Across U-V, V-W and W-U
Rectifier type AC voltmeter
(Note 1) (Not moving-iron type)
(Note 1) (Not moving-iron type)
Difference between phases is
within ±1% of maximum output
voltage.
within ±1% of maximum output
voltage.
Output side current I
2
U, V and W line currents
Moving-iron type AC ammeter
(Note 3)
(Note 3)
Current should be equal to or less
than rated inverter current.
Difference between phases is 10%
or lower.
than rated inverter current.
Difference between phases is 10%
or lower.
Output side power P
2
At U, V and W, and across U-V
and V-W
and V-W
Electrodynamic type single-
phase wattmeter
phase wattmeter
P
2
= W
21
+ W
22
2-wattmeter method
(or 3-wattmeter method)
(or 3-wattmeter method)
Output side power factor
Pf
Pf
2
Calculate in similar manner to power supply side power factor.
Converter output
Across P-N
Moving-coil type (such as
tester)
tester)
POWER lamp lit
1.35
1.35
×
V
1
Maximum 380V (760V) during
regenerative operation
regenerative operation
Frequency setting signal
Across 2 (+) -5
Moving-coil type (Tester, etc.
may be used) (Internal
resistance: 50k
may be used) (Internal
resistance: 50k
Ω
or larger)
0 to 5V/0 to 10VDC
"5" is
com
m
on.
Across 1 (+) -5
0 to ±5V/0 to ±10VDC
Across 4 (+) -5
4 to 20mADC
Frequency setting power
supply
supply
Across 10 (+) -5
5VDC
Across 10E (+) -5
10VDC
Frequency meter signal
Across FM (+) -SD
Approximately 5VDC at
maximum frequency
(without frequency meter)
maximum frequency
(without frequency meter)
Pulse width T1:
Adjusted by Pr.900
Pulse cycle T2: Set by Pr.55
(Valid for frequency
monitoring only)
monitoring only)
SD
is
com
m
on.
Across AM (+) -5
Approximately 10DVC at
maximum frequency
(without frequency meter)
maximum frequency
(without frequency meter)
Start signal
Select signal
Select signal
Across STF, STR, RH, RM, RL,
JOG, RT, AU, STOP, CS (+) -SD
JOG, RT, AU, STOP, CS (+) -SD
20 to 30VDC when open.
ON voltage: 1V or less
ON voltage: 1V or less
Reset
Across RES (+) -SD
Output stop
Across MRS (+) -SD
Alarm signal
Across A-C
Across B-C
Across B-C
Moving-coil type
(such as tester)
(such as tester)
Continuity check (Note 2)
<At OFF>
<At ON>
Across A-C: Discontinuity Continuity
Across B-C: Continuity
Across B-C: Continuity
Discontinuity
Pf
1
=
×
100%
P
1
3 V
1
×
I
1
Pf
2
=
×
100%
P
2
3 V
2
×
I
2
8VDC
T1
T2