Toshiba VF-SX - Manual (Page 21)

5-2 TOSHIBA
This chapter of the manual discusses some of the basic wiring configurations and
external devices commonly associated with the installation and application of
variable speed drives. Local codes, specifications, requirements, and operating
conditions may require the addition of other devices or modifications to the
following basic recommendations.
5.1 Inverter Wiring
(Refer to Figure 5.1 and 5.2)
1. It can be difficult to remove the upper cover after wiring, so change the
jumper selectors J1 or J2 on the internal PC board for "external signal
selection" before wiring the inverter. See Chapter 6 for the approximate
location of jumpers J1 and J2 inside the drive.
When a signal between 0 to 5V is used as frequency signal, switching the
jumper is necessary. Refer to Chapter 10, Table 10-9 for details.
2. Always turn the main line power OFF and confirm that there is no voltage
present with a testing tool before connecting power, motor leads, or
control wires.
3. WTOJIN^ Wait until the "CHARGE" lamp has turned off before working on
the drive. An internal capacitor stores electrical charge in the inverter
and electrocution may result due to inadvertent contact with this
capacitor. Do not touch the terminals or remove the cover while the
"CHARGE" lamp is on. This indicator is located in the lower right-hand
side of the drive near the terminal blocks, and it is a brightly lit red
LED when the drive is fully charged.
4. WARNING: Do not wire input power to the output terminals (U, V, W) of the
drive, this will damage the drive. Before energizing, confirm that motor
leads are attached to terminals U, V, and W and that the main power leads
are attached to terminals R, S, and T.
5. Exercise caution when wiring the control signals, as shown.
A. Install a surge suppressor on any electromagnetic coil on any
contactor wired to the drive. This includes line and load side
contactors.
B. Use shielded wire or twisted pair wire for control circuit wiring.
Keep this wire isolated from power wire.
C. Always isolate the input control signals from the main power wiring.
This restriction applies to all control terminals except FLA, FLB,
and FLC.
6. Wire sizes:
A. For wire to an ammeter, wire to a frequency meter, and wire carrying
input speed reference signals, use at least 16 gauge shielded wire.
B. For all other control wiring, use at least 12 gauge PVC coated wire.