Chapter 4 - Operation - Hitachi WJ200 Series Software Manual

Two-Speed Operation
The inverter can easily be configured for two-speed operation or infinitely variable speed operation by using the
following parameter settings in lieu of or in addition to those in the table above:
Parameter
Function
Code
EzSQ
A017
Operation
Terminal 7
C017
Status
The 2 speed control selection for the inverter is based on parameter C017, (C017=00) is applicable to
pendant stations with two-position pushbuttons, and can be applied to hoist and/or traverse axes. With
the above settings, at the first pushbutton position, the inverter will ramp to MIN speed as defined in
parameter P110 and hold. On depressing the button to the second pushbutton position, the inverter will
accelerate to the P120 parameter set speed and hold. Releasing the pushbutton back to the first position
will cause the inverter to decelerate back to the MIN speed as set in P110 and hold. Releasing the
pushbutton will cause the inverter to come to a stop.
Infinite Variable Speed Operation
Normal Operation
Once the inverter parameters are set as described in Chapter 3, you are ready to verify proper operation. It is
recommended to first test the system with the motor mechanically disconnected from the crane or hoist, to
ensure that any unexpected behavior will not damage the equipment or risk injury.
Energize the inverter and the pendant or other external control circuit power supplies, and press the pushbutton
connected to input terminal AC1. This is the UP hoist or FORWARD/LEFT traverse input. Observe motor
rotation. If direction is NOT correct, remove power from the inverter and wait 10 minutes for the capacitors to
discharge. Then interchange any two motor leads. Restore power and repeat the initial test. Direction should
now be correct. Once the corresponding AC1 pushbutton pressed to the first detent, the motor will accelerate in
the forward direction, (corresponding to UP motion for the hoist), to the frequency set in P110 (MIN speed), and
remain at that speed, unless:
•
The pushbutton is released, in which case the motor will come to a stop, OR
•
Ramp to a higher speed, while pushbutton is pushed to the second detent (AC3). If AC1 or AC 2 is
maintained, and AC3 is subsequently released, the speed attained at that time will be maintained.
•
Releasing AC1 or AC 2 at this point will cause the motor speed to ramp down or stop.
•
If AC1 or AC 2 remains off long enough, the motor will come to a stop.
•
If AC1 is re-activated at any speed above the MIN speed, then that speed will be maintained for the
duration. If AC1 is reactivated at a speed below the MIN speed, the motor will accelerate to MIN speed
and maintain that speed until one of the above events occurs.
The function of AC2 pushbutton is the same as the AC1 pushbutton, with the exception that rotation direction is
reversed (corresponding to DOWN operation for a hoist).
Setting
00 deactivates the C&H EZSQ software. 01 will activate the software
00, 01,
when the terminal FW is active on SJ700 units. 02 will make EZSQ
02
active at all times on WJ200 only.
00 is used for 2 speed operation. 01 is for infinite variable speed
00, 01
control
Page 11 of 15
Program Flowchart and Index
Comment