Operation - Mitsubishi Electric UM 5t Instruction Manual

After turning on the power of the UM-H type, the lifting and lowering operations will be
performed in the inverter mode.
After turning on the power of the UM-S type, the lifting, lowering, and traversing operations
will be performed in the inverter mode.
(1) Inverter-driven lifting/lowering operation
The UP and DOWN pushbutton switches are the 2-step type. Press each switch to the first
step to perform lifting/lowering operation at a low speed. Press each switch to the second
step to perform rated speed operation (inverter output = approx. 60 Hz). If the No-load
high-speed function is set, the ultra high speed will be automatically selected. (Before
delivery from our factory, the No-load high-speed function is canceled. So set this function
whenever necessary.)
To set the high speed or low speed, use the operation function setting area (equipped for the
standard type). The mode button is in this area. Using this button, enter the frequency
setting mode, and change the frequency to set the desired speed.
Speed change between high speed and low speed (lifting/lowering operation)
Pressing
Pushbutton
Lifting/
UP/DOWN
lowering
Operation with a sequencer
When the sequencer output circuit gives SSR output, the hoist may become unstable or enter the
ON state due to leakage current from the snubber circuit.
Countermeasure: Externally fit a resistance, R, to bypass the leakage current.
R = Approx. 30 k Ω , 3 W
Sequencer output circuit
Snubber circuit

Operation

No-load
high-speed 1st step
function
With
Low speed
function
Without
Low speed
function
Bypassing leakage
current from the
snubber circuit
－14－
2nd step
In No-load mode only
Rated high speed
High speed
Hoist input circuit
Ultra high speed