Mitsubishi Electric FR-A800, Instruction Manual

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Installation and wiring Main circuit terminals
FR-A800 2 - 31
#
The terminal screw size indicates the size of terminal screw for R/L1, S/L2, T/L3, U, V, W, PR, PX, P/+,
N/–, P1, and a screw for earthing (grounding).
The screw size for PR and PX terminals of FR-A820-00340(5.5K) and FR-A820-00490(7.5K) is indicated
in parentheses.
The screw size for earthing (grounding) of FR-A820-00930(18.5K) or higher and FR-A840-
04320(160K) or higher is indicated in parentheses.
A screw size for P/+ terminal for option connection of the FR-A840-03250(110K) and FR-A840-
03610(132K) is indicated in parentheses.
The line voltage drop can be calculated by the following formula:
Use a larger diameter cable when the wiring distance is long or when it is desired to decrease the volt-
age drop (torque reduction) in the low speed range.
Line voltage drop [V] =
√
3 × Wire resistance [m
Ω
/m] × Wiring distance [m] x Current [A]
1000
NOTES The above shows a selection example for the ND rating. For selecting the SLD rating, LD rating, or
HD rating, refer to the Technical News (MF-X-121) contained in the enclosed CD-ROM.
Tighten the terminal screw to the specified torque.
A screw that has been tightened too loosely can cause a short circuit or malfunction.
A screw that has been tightened too tightly can cause a short circuit or malfunction due to the
unit breakage.
Use crimping terminals with insulation sleeves to wire the power supply and motor.