Vfd Control Modes; Manual Torque Boost / Automatic Torque Boost Parameters - Hitachi P1 Basic Instruction Manual

VFD CONTROL MODES

If you need to change the VFD control mode for testing, troubleshooting, or changing an open loop hoist to closed loop reference the
parameter chart below. Only choose the options provided below that are verified to be compatible with the DH firmware.
NOTE – Once you have changed the control mode it is recommended to cycle power.
IMPORTANT! – It is not recommended to change the control mode from closed loop to open loop unless for troubleshooting purposes
with an empty hook!
Function
VFD Control Mode
IMPORTANT!

MANUAL TORQUE BOOST / AUTOMATIC TORQUE BOOST PARAMETERS

The manual and automatic torque boost parameters are only valid for VFD control modes 00 CT and 03 ATB.
Function
Manual Torque Boost Operation
Manual Torque Boost Value
Manual Torque Boost Peak Speed
Boost to % of base frequency
Automatic Torque Boost Voltage Comp Gain
Automatic Torque Boost Slip Comp Gain
– NEVER change a closed loop VFD to open loop with a load on the hook or load may fall!
Parameters
AA121
Parameter
Hb140
Hb141
Hb142
HC101
HC102
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Value
10: Closed Loop Vector
09: Open Loop 0-Hz Domain SLV
08: Open Loop SLV
03: Open Loop Automatic Torque Boost
00: Open Loop Constant Torque
Example Value
00: Disabled
01: Always
02: Forward Direction
03: Reverse Direction
0 – 20
(4.0 default)
0 – 50
(4.0 default)
0 – 255
(100 default)
0 – 255
(100 default)