Rockwell Automation 1305 AC Drive, Series A and B, Firmware 4.xx-5.xx - Manual (Page 84)

Chapter 5 – Programming
5-12
Set Up Group (cont.)
[Overload Mode] Parameter # 37 Factory Default “No Derating” [Overload Mode]
Parameter Type Read & Write
This parameter selects the derating factor for the I 2 t
electronic overload function. Designed to meet NEC Article
Units None Settings ‘‘No Derating” 10:1 Speed Range
– No Derating Refer to Figure 5.2
electronic overload function. Designed to meet NEC Article
430 and UL (file E59272) equivalent requirements.
Additional overload devices do not need to be installed.
‘‘Min Derate” 4:1 Speed Range
– Derate below 25% of Base Speed.
Refer to Figure 5.3
‘‘Max Derate” 2:1 Speed Range
– Derate below 50% of Base Speed.
Refer to Figure 5.4
100
80
60
40
20
0 25 50 75 100 125 150 175 200
% Base Speed
Figure 5.2 No Derating
100
80
60
40
20
100
80
60
40
20
Figure 5.3 Min Derating Figure 5.4 Max Derating
% Base Speed % Base Speed
0 25 50 75 100 125 150 175 200 0 25 50 75 100 125 150 175 200
[Overload Current]
% of
Setting
[Overload Current]
% of
Setting
[Overload Current]
% of
Setting
[Overload Current] Parameter # 38 Factory Default 115% of Drive Rated Current Displayed in Amps [Overload Current]
T s v ue s u d e se e r ep e u d
Parameter Type Read & Write Minimum 20% of Drive Rated Current Displayed in Amps This value should be set to the motor nameplate Full Load
Amps (F.L.A.).
Units 0.1 Amps Maximum 115% of Drive Rated Current Displayed in Amps