7 Looping Option
The following table demonstrates how the looping process reduces
the current setting of the overload by the number of times the wires
pass through the windows of the overload.
All current values are expressed in amperes.
Overload
Number
Number of Times
Current
of
Wire Passes
Range
Loops
Thru Window
Shown on label
10 - 40
0
1
Option A
5.0 - 20
1
2
Option B
3.0 - 12
2
3
Option C
2.5 - 10
3
4
Option D
2.0 - 8
4
5
Option E
1.5 - 6
5
6
Current CT
Range
Ratio
Cat #
3UB81234JW2
100-300 300.5
2
3UB81234KW2
133-400 400.5
2
3UB81234LW2
200-600 600.5
2
3UB81234MW2
250-750 750.5
2
3UB81234NW2
400-1220
1200.5
2
# of times
wire passes
through window
for ESP200 with windows
In applications involving the use of 12 or 14 AWG wire, usually motors of
5HP or less, the wires maybe looped and passed through the windows
repeatedly before connecting to the contactor. By looping the motor
leads through the windows in the overload a second time, the overload
will read twice the current actually going to the motor. Hence the
overload can protect a motor needing half the FLA capability of the
overload. An overload with a current of 10 to 40 amperes can be used for
a motor FLA between 5 to 20 amperes.
Similarly, motors that require only one-third, one-fourth, or one-fifth the
overload’s FLA capability can use the same size ESP200 starter by
looping three, four, or five times.
Hot Terminals
Possible cause: Loose wire connections
Action:
Clean connections and tighten to recommended torque.
Failure To Trip Out
Possible cause: Incorrect dial setting
Action:
Readjust dial setting to the FLA on the motor nameplate.
Overload Trips
Possible cause: Motor is overloaded
Action:
Remove cause of overload and reset overload relay.
Possible cause: Loss of phase
Action:
Replace burnt-out fuse, or reconnect wire in missing phase.
Possible cause: Dial setting is too low
Action:
Readjust dial setting to the FLA on the motor nameplate.
Possible cause: Unbalance Phase
Action:
Correct the power system.
Possible cause: Ground Fault
Action:
Fix the fault and restart.
Possible cause: Set at the wrong trip class
Action:
Reset the dip switches to the correct trip class.
6 Troubleshooting
3
Siemens Industry, Inc. 5300 Triangle Parkway, Norcross, GA 30092 www.usa.siemens.com
5 Reset and Test Buttons
READY
RESET
Trip Class
5
10
20
30
*
3 min.
5 min.
10 min.
15 min.
**
0.5 min.
1 min.
2 min.
3 min.
Contact Test
Device Test
(electronic functions)
NC 95 96
NO 97 98
O
O
O
O
TEST
NC 95 96
NO 97 98
RESET
NC 95 96
NO 97 98
O
O
O
O
O
O
O
O
Fig. 8
8 ESP200 wiring with External CTs
Fig. 9
ESP200
FULL LOAD AMPS
RESET
TEST
CAT.NO.
48ATC3S00
3UBB123-4CW2
95
96
A3+
A4- 97 98
5
6
4
3
12
10
7
8
9
5
TRIP CLASS
PHASE UNBAL ON
PHASE LOSS ON
OFF
OFF
RESET MODE MAN
GROUND FAULT ON
AUTO
OFF
10
20
30
X1
L1
X1
L2
X1
L3
Current Transformers (CT)
Note:
Must have at least 80% of Motor amps for this test to work.
* The device must be energized with a running motor for at least the
minimum time, shown in the table.
** Then the test button can be pushed and held until the device trips.
The trip time depends on the selected Trip Class as shown in the table.
