Rockwell Automation 1305 AC Drive, Series A and B, Firmware 4.xx-5.xx - Manual (Page 22)

Chapter 2 – Installation/Wiring
2-6
INPUT POWER CONDITIONING
The drive is suitable for direct connection to a correct voltage,
single phase or three-phase, AC power line. However, there are
certain power line conditions which may introduce the
possibility of drive input power component malfunction. To
reduce the possibility of these malfunctions, a line reactor or
isolation type transformer with an input impedance of 3% of
the drive input VA rating may be required.
The basic rules for determining if a line reactor or isolation
type transformer is required are as follows:
1. If the AC line supplying the drive has power factor
correction capacitors that are switched in and out, installing
an AC line reactor or isolation type transformer between the
capacitor bank and the drive input may be required. Damage
to drives can occur from the extreme current spikes caused
by capacitor switching.
2. If the AC line frequently experiences transient power
interruptions or significant voltage spikes, an AC line
reactor or isolation type transformer may be required.
Damage to drives can occur from extreme current spikes.
INPUT FUSING
ATTENTION: The drive does not provide
branch circuit protection. Specifications for the
recommended fuse size and type which provide
branch circuit protection against short circuits are
provided in Table 2.A. Branch circuit breakers or
disconnect switches cannot provide this level of
protection for drive components.
Table 2.A Maximum Recommended AC Input Line Fuse
UL Class J, T, CC, or BS88 (or equivalent)
3 O Rating
kW (HP)
1 O Rating
kW (HP)
Fuse
200–230V Rating
Fuse
380–460V Rating
.37 (1/2) .19 (1/4) 6 3➀
.55 (3/4) .37 (1/2) 6 3➀
.75 (1) .55 (3/4) 10 6➁
1.5 (2) .75 (1) 15 10➁
2.2 (3) 1.5 (2) 25 15➁
4.0 (5) –– –– 20➁
➀ Must be dual element time delay, Bussmann LPJ or equivalent.
➁ If fuse blowing is a problem, use dual element type fuses.