Auto-Speed 90Hz Function - Hitachi P1 Basic Instruction Manual

AUTO-SPEED 90HZ FUNCTION

The auto-speed function will allow the VFD to increase the high speed to 90Hz when there is an empty hook or a light load. You can
set this function for automatic or for input activation. The auto-speed function is not available when using 0-10V/4-20mA speed
control methods, when micro-speed is active, and or when in tandem mode.
HOW IT WORKS – When the hoist is commanded in the forward/up direction and the frequency reaches the set high speed frequency,
the VFD will check to see if the load monitor value is less than the auto-speed activation value and allow the frequency to increase to
the auto-speed frequency.
NOTE – While operating in control modes (AA121) sensorless vector control (08), zero speed area sensorless vector control (09), or
vector control with encoder (10) the Auto-Speed Activation Value will be based on torque. While operating in any other modes the
Auto-Speed Activation Value will be based on the VFD's output current FLA ratio.
Use the charts below to properly configure the auto-speed function. In the chart below the digital input 6 is shown as the auto-speed
input activation.
Function
Auto-Speed Activation Value
Auto-Speed Activation Method
Auto-Speed Frequency
Digital input 6 Auto-Speed Activation Input
Step
Attached 30% rated load to the hook block and lift the load just off the ground.
1
*NOTE – 30% should be the max load for 90 Hz & 60% should be the max load for 75 Hz
Navigate to VFD parameter db-14. This will display the load value that will be used to set the auto-speed activation
2
level.
Using the pushbutton or radio, command the hoist in the up/forward direction with high speed and record the value
3
of VFD parameter db-14 while the load is operating at the high-speed frequency.
Navigate to VFD parameter UE-21 and set the value to the value recorded from db-14 + 3%.
4
(example db-14 = 37, set UE-21 = 40)
Verify the auto-speed function works by lifting the same load at high speed. If the auto-speed function is configured
5 for automatic then you should see the speed increase to 90hz, if you are using the input activation function then make
sure the input is active and you should see the speed increase to 90hz
Parameter
UE-21
UE-22
(configure available digital input function to 92: MI7)
UE-14
CA-06
Instruction
Page 13
Example Value
50
0 = Automatic
1 = With Input Activation
9000 (90.00 Hz)
92:MI7