Mitsubishi Electric UM 10t, Instruction Manual

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12
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Test Run
No-Load Operation
At first, press the UP button, and check whether the hook is lifted. If the hook is lowered,
exchange the connected terminals of the R-phase and T-phase wires with each other. The power
cable has 3 wires: R-phase, T-phase, and grounding wires. To operate 2 or more hoists on the
same trolley line, be sure to exchange the wires between the trolley pole and the electromagnetic
contactor. In this case, do not exchange the wires of the pushbutton switches.
If the hook is lifted by pressing the DOWN
switch, the hook will move to the second
stage limit switch. After this operation, the
hoist will not move even if the UP or
DOWN button is pressed. In this case,
follow the procedure below to restore
operation:
(1) Remove the connection rod linking the
lever and the limit switch.
(2) Turn the clockwise the shaft beside the
control box to restore the limit switch.
Keep the arm on the shaft.
(3) Press the DOWN button to lower the hook
gradually by inching. Before lowering
the hook, be sure to exchange the
connected terminals of the R-phase and
T-phase wires with each other.
(4) Re-assemble in the order reverse to the dis-
assembling order.
“EAST” and “WEST” shown on the
pushbuttons respectively indicate the
traveling directions when the hoist is
viewed from the control box (see the
figure shown on the right side).
Last of all, run the hoist over the whole
length with no load, and make sure that
there are no abnormalities.
Warning
●
When correcting the phase sequence, do not change the electrical connection of the pushbuttons on the operation box.
⋅
Or else, the limit switch is disabled. This causes the wire rope to break and the suspended load to fall off, possibly
causing an injury.
West (Left)
East (Right)
Connection rod
Arm
Lever
Control box
Traversing
(In the case of a double rail type, the control
box is located in the east, and the opposite
side is in the west.)
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