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Basic functions (Pr. 0 to Pr. 9)
PARAMETERS
3
3.3.3 Base frequency, base frequency voltage (Pr. 3, Pr. 19)
<Setting>
• Use Pr. 3 to set the base frequency (rated motor frequency).
• If only "50Hz" is given on the motor rating plate as the frequency, always set the "base frequency" to "50Hz". If it
remains at "60Hz", the voltage may become too low and torque shortage occurs, resulting in an overload trip.
• Use Pr. 19 to set the base voltage (e.g. rated motor voltage).
The motor whose rated voltage is lower than the power supply voltage of the inverter can be used optimally. This
function is useful when a motor rated at 200V is used with a 230V power supply.
• Set Pr. 19 "base frequency voltage" according to the motor as shown below.
SF-V5RU-3.7kW or less . . . . . . . . . . . "170V"
SF-V5RU-5.5kW or more . . . . . . . . . . "160V"
SF-V5RUH-3.7kW or less . . . . . . . . . "340V"
SF-V5RUH-5.5kW or more. . . . . . . . . "320V"
SF-VR. . . . . . . . . . . . . . . . . . . . . . . . . "160V"
SF-VRH . . . . . . . . . . . . . . . . . . . . . . . "320V"
Set "50Hz" in Pr. 3 "base frequency".
3.3.4 Multi-speed operation
(Pr. 4 to Pr. 6, Pr. 24 to Pr. 27, Pr. 232 to Pr. 239 )
Use this parameter for V/F control only.
This parameter matches the inverter outputs (voltage, frequency) to the motor rating.
Parameter Name Factory Setting
Setting
Range
Remarks
3 Base frequency 60Hz 10 to 200Hz Extended mode
19 Base frequency voltage 9999
0 to 1000V,
8888, 9999
Extended mode
8888: 95% of power supply voltage
9999: Same as power supply voltage
REMARKS
If vector control is disabled due to an encoder fault, setting "20" in Pr. 800 "control system selection" enables operation under
V/F control. (Refer to page 169.)
Related parameters
Motor setting ⇒ Pr. 71 "applied motor", Pr. 450 "second applied motor" (Refer to page 111.)
Can be used to change between the predetermined running speeds by switching from one terminal to
another.
z Any speed can be selected by merely turning on-off the contact signals (RH, RM, RL, REX signals).
z Using these parameters with Pr. 1 "maximum speed" and Pr. 2 "minimum speed" allows the setting of up to
17 speeds.
POINT
z Valid in the external operation mode or in the combined operation mode that is made available by setting "3 or
4" in Pr. 79.
z Valid when "0" is set in Pr. 59.
speed torque
position
ON
ON ON ON ON
ON
ON
ONONON
ON
Speed 1
(high speed)
Speed 2
(middle speed)
Speed 3
(low speed)
Speed 4
Speed 5
Speed 6
Speed 7
RH
RM
RL
Time
Priority: RL > RM > RH
Time
Speed 8
Speed 9
Speed 10
Speed 11
Speed 12
Speed 13
Speed 14
Speed 15
ON
ON ON ON
RH
ON ON ON ON
RM
ON
ON
ON
ON
RL
ON
ON
ON ON ON ON ONON
REX
Output speed (r/min)
Output speed (r/min)
*1
*1 If "9999" is set in Pr. 232 "multi-speed setting (speed 8)",
the output speed is 0r/min when RH, RM and RL are turned off and REX is turned on.