Toshiba VF-SX - Manual (Page 132)

TOSHIBA
12-11
1. No-Load Current Setting
The parameter [
C U r O
] of group
[ C f ~ . C
C] can be set at the standard
default value of lOX for most applications. Additional adjustment is generally
not necessary. However, in the following cases adjustment of this parameter may
be effective.
1. This parameter will affect the slip compensation starting point. When the
value of [
C U r O ]
is increased, the value of the output torque when
compensation begins will increase slightly.
2. This parameter is also used as the setting data of the no-load current in
automatic torque boost function. When this parameter is changed, the
setting data for the no-load current in automatic torque boost function
will also change.
3. The value will not always be the same as the no-load current value noted
on the application motor data sheet or rating nameplate.
2. Motor Rating Slip Frequency
The rated slip frequency is defined by the motor data available on the nameplate
or motor data sheet. Refer to this data when setting parameter
[S F (~ ]
EXAHPLF:
Set slip frequency compensation for a 1 HP motor, 230 volts, 60 HZ rated. The
motor nameplate states that the rated speed is 1710 RPH. (Synchronous speed is
1800 RPH)
Rated Slip Frequency ISvnchronous Sneed - Rated Soeedl
Synchronous Speed
11800 - 17101 X 60
1800
X Output Frequency
- 3 HZ; (Set parameter [
5 F f”
] to 3)