25
7.7 Motor Overload (I
2
t) with RMS Current Limit (CL)*:
Sets the current limit (overload),
which limits the maximum current to the motor, prevents motor burnout, and eliminates
nuisance trips. The CL Trimpot is factory set to 160% of the drive rated current. To
increase the current limit, rotate the CL Trimpot clockwise. To decrease the current limit,
rotate the CL Trimpot counterclockwise. See Figures 33 – 38.
*UL approved as an electronic overload protector for motors.
In order to ensure that the motor is properly protected with the I
2
t feature, it is
required that the CL Trimpot be set for 160% of the motor nameplate rating. This is
accomplished as follows:
Note:
This adjustment must be made within 6 seconds or the I
2
t Trip will occur.
1.
Connect an AC RMS ammeter in series with one motor phase.
2.
Set the CL Trimpot fully counterclockwise.
3.
Adjust the speed setting to 30% of full speed.
4.
Lock the motor shaft and adjust the CL Trimpot to 160% of the motor nameplate
rated current.
Example:
A 2 HP motor has a full load current rating of 5.2 Amps. Set the CL
Trimpot to 5.2 X 160% = 8.3 Amps
(Shown Factory Set to 10.7
Amps)
4.0
CL
12.5
6.1
8.3
10.7
FIGURE 33 – CATALOG NO.
ID5202-CO CL TRIMPOT RANGE
(Shown Factory Set to 14.4
Amps)
17.0
5.5
CL
7.4
9.8
14.4
FIGURE 34 – CATALOG NO.
ID5203-CO CL TRIMPOT RANGE
3.8
1.3
CL
2.0
2.6
3.2
(Shown Factory Set to 3.2 Amps)
FIGURE 35 – CATALOG NO.
ID5401-CO CL TRIMPOT RANGE
6.2
2.1
CL
3.1
4.2
5.3
(Shown Factory Set to 5.3 Amps)
FIGURE 36 – CATALOG NO.
ID5402-CO CL TRIMPOT RANGE
(Shown Factory Set to 13.3 Amps)
15.5
5.0
CL
7.6
10.3
13.3
FIGURE 38 – CATALOG NO.
ID5405-CO CL TRIMPOT RANGE
(Shown Factory Set to 7.4 Amps)
8.5
3.0
CL
4.4
5.8
7.4
FIGURE 37 – CATALOG NO.
ID5403-CO CL TRIMPOT RANGE
Summary of Contents for SERIES 5
Page 29: ...NOTES 29...
Page 30: ...NOTES 30...