Easy-Start ES Instruction Manual
Options
SECTION 4
4-17
Application Notes
Example-2:
This is an application where a motor may require
starting current of less than 500%, but for a
longer period of time.
Below is a table showing trip time in seconds vs.
percent current limit: points were taken from
Figure 3-1 of the Instruction Manual. Data was
taken from the 40¡C ambient curves.
Motor: 150 HP, 180 FLA, 460V ac 3-Phase,
Service Factor = 1.00
Assume the starting requirement for the motor in
this application is 350% current limit for 40
seconds.
3.5 X 180 = 630 Amps
If we select Easy-Start ES Model ES180 and set
the DIP switch for the maximum of 180 amps, we
conclude from the table above that the unit would
trip in 24 seconds, at a curr trip setting of 1.00.
You must select an oversized starter;
Select
Model ES260
.
DS1 Setting Ò1111Ó
(Note: The 1st column
must always be used for
the Starting Current
Calibration.)
260.0 Amps:
ÒStartingÓ Current Calibration
- Current Limit Adjust (200-500%) 520-1300
amps.
- Set Current Limit at 630 amps
242% of Easy-Start ES rating, (about 1/6
CW) this is 350% of motor full load amps. At
this ac current level, the trip time will be
slightly greater than 40 seconds.
179.9 Amps:
ÒRunningÓ Current Calibration
- The Extended Time-Current option
automatically enables DIP switch DS2 at the
End-Of-Ramp, and therefore the electronic
overload current circuit would be calibrated to
the combined settings of the two DIP
switches DS1 and DS2.
DS1
DS2
Amps
1111
101
179.9
PERCENT CURRENT LIMIT
200%
250%
300%
350%
400%
500%
Curr Trip 1.00
60 Sec
40 Sec
30 Sec
24 Sec
20 Sec
14 Sec
Curr Trip 1.15
95 Sec
60 Sec
40 Sec
30 Sec
25 Sec
18 Sec
Curr Trip 1.20
100 Sec
70 Sec
45 Sec
35 Sec
27 Sec
20 Sec
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