Omron 3G3JV Manual page 14

Function of Each Parameter
Frequency Reference Upper and Lower Limit
Settings (n30 and n31)
Set the upper and lower frequency reference limits in percent-
age based on the maximum frequency as 100%.
Value Name
n30 Frequency Reference
Upper Limit
n31 Frequency Reference
Lower Limit
Note: If n31 is set to a value less than the minimum output fre-
quency (FMIN) (n14), the Inverter will have no output
when a frequency reference less than the minimum out-
put frequency input is ON.
Rated Motor Current Setting (n32)
Set the rated motor current as the reference value for motor
overload detection (OL1).
Note: 1. Setting 0.0 disables the motor overload detection (OL1) func-
tion.
2. The rated motor current value is factory-set for each Inverter
according to the maximum applicable motor capacity.
Value Name
n32 Rated Motor Current 0.0% to 120% (A) of
rated output current
of Inverter
Motor Protection Characteristic Selection (n33)
Set the motor overload detection (OL1) for the electronic thermal
characteristics of the motor.
Value
0 Protection characteristics for general-purpose induction motors
1 Protection characteristics for Inverter-dedicated motors
2 No protection
Note: When connecting multiple motors to one Inverter, set 2
(equivalent to n32 = 0.0). In addition, take overload pre-
vention measures by mounting a thermal relay in each
motor, for example.
Motor Protective Time Setting (n34)
Set the electronic thermal characteristics of the motor to be con-
nected in 1-minute increments.
Value Name
n34 Motor Protective Time
Setting
Note: 1. The default setting does not need any changes in normal op-
eration.
2. To set the parameter according to the characteristics of the
motor, confirm the thermal time constant with the motor
manufacturer and set the parameter with some margin. In
other words, set the value a little shorter than the thermal time
constant.
3. To detect motor overloading more quickly, reduce the set val-
ue, provided that it does not cause any application problems.
16
Setting Unit of Default
range setting settings
0 to 110 1% 100
0 to 110 1% 0
Setting range Unit of Default
setting settings
0.1 A Varies with
the capac-
ity.
Description
Setting Unit of Default
range setting settings
1 to 60 1 min 8
Cooling Fan Operation Function Selection (n35)
This parameter is used to operate the cooling fan of the Inverter
while the Inverter is turned on or only while the Inverter is in op-
eration.
Value
0 The fan rotates only while the RUN command is input and for 1
minute after the Inverter stops operating.
1 The fan rotates while the Inverter is turned ON.
Note: 1. This parameter is available only if the Inverter incorporates a
cooling fan.
2. If the operation frequency of the Inverter is low, the life of the
fan can be prolonged by setting the parameter to 0.
Multi-function Input Selection (n36 to n39)
Select the functions of multi-function input terminals S2 to S5.
Value Name
n36 Multi-function Input 1
(S2)
n37 Multi-function Input 2
(S3)
n38 Multi-function Input 3
(S4)
n39 Multi-function Input 4
(S5)
Value Function
0 Forward/Reverse 3-wire sequence (to be set in n37 only)
rotation command
This setting overrides the n36 setting.
2 Reverse/Stop Reverse rotation command (2-wire
sequence) (ON: Reverse)
3 External fault (NO) ON: External fault
4 External fault (NC) OFF: External fault
5 Fault reset ON: Fault reset
Note
Signals to select frequency references 1 to
6 Multi-step speed
reference 1 8. 8.
7 Multi-step speed
reference 2
8 Multi-step speed
reference 3
10 Inching frequency ON: Inching frequency command
command
11 Acceleration/Decel- ON: Acceleration/deceleration time 2
eration time selec-
tion
12 External base block ON: Output shut OFF (while motor coasting
command (NO) to a stop and "bb" flashing)
13 External base block OFF: Output shut OFF (with motor free
command (NC) running and "bb" flashing)
14 Search command ON: Speed search (Searching starts from
(Searching starts n09)
from maximum fre-
quency)
Description
Setting Unit of Default
range setting settings
2 to 8, 10 to 1 2
22
0, 2 to 8, 10 1 5
to 22
2 to 8, 10 to 1 3
22
2 to 8, 10 to 1 6
22, 34
Description
S1: RUN input (RUN when ON)
S2: STOP input
(STOP when OFF)
S3: Forward/Reverse rotation
command
(ON: Reverse)
Disabled while RUN command is
input