TECO speecon 7200ma Instruction Manual page 59

•The speed search command can be set through the multi-function contact input
terminal ~
If Sn-25 ~ Sn-28= 21 : Speed search is performed from Max. output frequency
If Sn-25 ~ Sn-28= 22 : Speed search starts from the frequency command when
•After the inverter output is blocked, the user should input speed search command
then enable run operation, the inverter will begin to search the motor speed after
the min. baseblock time Cn-37.
•Speed search operation, if the inverter output current is less than Cn-35, the
inverter will take the output frequency as the real frequency at that time. From
those values of real frequency, the inverter will accelerate or decelerate to the set
frequency according to the acceleration or deceleration time.
•While the speed search command is being performed, the user can slightly
decrease the setting of V/F curve (Cn-38) in order to prevent the OC protection
function enabled. Normally, the V/F curve need not be changed. (As below)
•Speed search operating V/F curve = Cn-38 * (normal operating V/F curve )
Note : 1. The speed search operation will be disabled if the speed search command is
enacted from the Max. frequency and the setting frequency. (I.e., Sn-25=20,
Sn-26=21 and multi-function input terminals
2. Make sure that the FWD/REV command must be performed after or at the
same time with the speed search command. A typical operation sequence is
shown below.
3. When the speed search and DC injection braking are set, set the Min.
baseblock time (Cn-37). For the Min. baseblock time, set the time long
enough to allow the motor's residual voltage to dissipate. If an overcurrent
is detected when starting a speed search or DC injection braking, raise the
setting Cn-37 to prevent a fault from occurring. As a result, the Cn-37
setting cannot be set too small.
(By setting the parameters Sn-25 ~ Sn-28).
and motor is coasting freely.
the speed search command is enabled.
Ry1
Ry1
Ry2
,
Speed search command
RWD/REV run command
57
is used at the same time).