YASKAWA Varispeed f7, Programming Manual

Page: 91 / 202

Programming 83
Function: Speed Search 1
Setting: 61
Function: Speed Search 2
Setting: 62
The Speed Search function can be turned on for all starts with parameter b3-01. If, however, it is beneficial to only use Speed
Search at certain starts, a digital input can be programmed to turn on Speed Search only when it is closed.
Speed Search 1 will start searching for the rotor speed from the maximum frequency (E1-04). Speed Search 2 will begin
searching for the rotor speed from the existing frequency reference. Speed Search 3 will cause the motor to baseblock when
the switch is open and then perform Speed Search when it closes.
In all cases the form of Speed Search, Speed Estimation or Current Detection, is determined by the setting of b3-01. If b3-01=
“0: SpdsrchF Disable”, then the Speed Estimation form of Speed Search is used. If b3-01= “2: SpdsrchI Disable”, then the
Current Detection form of Speed Search is used.
Function: Field Weakening Command
Setting: 63
When the Field Weakening Command is closed (H1-0x = 63) the Drive’s output voltage level is reduced to the level set in
parameter d6-01 at the output frequency set in d6-02. Field Weakening Command can only be in V/f control methods (A1-02
= 0 or 1).
Function: Speed Search 3
Setting: 64
See setting 61 and 62 for details.
Function: KEB Ridethru N.C.
Setting: 65
Function: KEB Ridethru N.O.
Setting: 66
The Kinetic Energy Braking (KEB) control circuit attempts to maintain the DC bus voltage at an optimum level [1.35 × input
voltage (E1-01)] during momentary power loss, by using load inertia to regenerate voltage back to the DC bus. The Drive
decelerates at the fast-stop rate (C1-09), until power is restored, or until the time runs out and an undervoltage fault (UV)
occurs. The larger the inertia, the longer the deceleration rate can be extended. If the inertia is small, then the Drive must
decelerate quickly to regenerate voltage back to the DC bus, and thus the ride-through time is shorter.
Table 17 Digital Input Functions
Setting of b3-01 Speed Search Method Used for Multi-function inputs
0
Speed Estimation
1
2
Current Detection
3