Mitsubishi Electric FR-A700 Technical Manual page 508

(d) This function is valid for V/F control only.
(When [Pr. 72
automatically selected.)
(e) A sine wave filter and MT-HC can not be used
together.
Sine wave filter *
U X
Inverter
V Y
W Z
(Carrier 2.5kHz)
Reactor
+
0
Capacitor
-
Inverter output voltage
wave form
(8) Wiring of control circuit
1) Use twisted or shielded cables for connection with
the control circuit terminals (10, 2, 5, 1, 4, AM). Do
not earth (ground) the shield but connect it as
indicated below. (Keep the other end of the shield
open)
2) Use twisted or shielded cables for connection with
the display (frequency) meter terminals (FM, SD)
over a wiring distance of 200m maximum. If the
distance exceeds 200m, the display (frequency)
meter reading may result in a larger error.
3) Wire the control circuit cables away from the
power line over the shortest distance.
[Example 1] Shielded cables
Inverter
10
2
5
Within 30m
<Correct>
Connecting the shielded cables
[Example 2] Shielded cables joined
Inverter
10
2
5
Within
30m
Provide a shielding terminal
<Correct>
Connecting the shielded cables
= 25], V/F control is
IM
Motor
Voltage
(Capacitor)
Current
Wave form at a motor
terminal
Inverter
10
2
5
Wrong connection
<Incorrect>
Inverter
10
2
5
Wrong connection
<Incorrect>
(9) Countermeasures against external noise
1) Strengthening the countermeasures against noise
The FR series inverters are sufficiently protected
from noise. However, extremely large external
noise may cause the inverter to malfunction.
When there is such external noise that cannot be
eliminated, wire the inverter in accordance with
the following figure.
MCCB
Start
Frequency setting
potentiometer
Noise reduction techniques
2) Remote control, etc.
Acting as an antenna, the single lines are
susceptible to external noise. Therefore, run the
signal lines as far as possible from the power line.
If the inverter is controlled 30m or further away
from its installation position, it is recommended to
use any of the following:
(a) Speed setting device
Use the FR-FK motorized speed setter. (For
the
corresponding manual.)
(b) External start/stop signal
Add a relay in the vicinity of the inverter.
(c) Cable
Use twisted or twisted shielded cables.
(d) Surge suppressors
Install surge suppressors to the coils of the
relays, valves etc. around the inverter.
[Example]972A-2003 504 11
(manufactured by MATSUO ELECTRIC CO.,LTD.)
Blue vinyl cord
10 or less
10 3
200 or more
Composition
542
SELECTION
U
R
Inverter
S V
T W
STF(STR), etc
SD
RES
SD
10
2
FM
SD
5
(frequency meter)
operation information,
Red vinyl cord
Vinyl sheath
6
10 or less
10 3
4 dia. hole
15 1
200 or more
48 1.5
0.5 F1W50
Motor
M
Reset
Display
see the
18 1.5
31.5 ±
(Unit: mm)