Toshiba Adjustable Speed Drive H3 - Manual (Page 20)

TOSHIBA
4 - 4
Selection of Main Circuit Wiring Equipment and Standard Cable Sizes (cont'd)
* The customer supplied Molded Case Circuit Breaker (MCCB) or Magnetic Circuit
Protector (MCP) should be coordinated with the available short circuit current. The
drives are rated for output short circuit fault currents of 200,000A (in all horsepowers).
The selection of breakers for this table is in accordance with 1987 NEC Article 430.
** Wire sizing is based upon NEC table 310-16 or CEC Table 2 using 75 deg C cable, an
ambient of 30 deg C, cable runs for less than 300 FT., and copper wiring for not more
than three conductors in raceway or cable or earth (directly buried). The customer
should consult the NEC or CEC wire Tables for his own particular application and wire
sizing.
*** Use two parallel conductors instead of a single conductor (this will allow for the proper
wire bending radius within the cabinet). Use separate conduits for routing parallel
conductors. This prevents the need for conductor derating (see note 3 this page).
Notes:
1.) Contacts used to connect drive terminals should be capable of switching low
current signals (i.e. 5 mA).
2.) The drive has internal overload protection which has been calibrated and
certified by Underwriters Laboratories Inc. and does not require external motor
overload protection.
3.) When wiring with parallel conductors, the conductors should be kept together in
phase sets with U1, V1, W1 in one conduit and parallel conductors U2, V2, W2
in another conduit. The ground conductor should be in one of these conduits.
4) Twisted pair wiring should be used for external meters connected to AM and FM
terminals.
5) For multiple motor applications, a magnetic only MCP should be replaced
by a thermal magnetic MCCB. The MCCB should be sized according to (1.25 X
largest motor full load amps) + sum of all other motor full load amps to meet
National
Electric Code (NEC) or Canadian Electrical Code (CEC) requirements.
Applications featuring multiple motors on one drive require overload protection for
each motor.
Turn off power to the drive before making any wiring
changes to the analog output circuits. CAUTION
Use separate conduits for routing incoming power, power
to motor, and control conductors. Use no more than three
power conductors and a ground conductor per conduit.
CAUTION