16
Instruction Book
IB019008EN October 2016 www.eaton.com
FP-25-LV-VSR
Breaker-To-Motor Starter Conversion
5. An electrically separate normally open (NO) contact and
an electrically separate normally closed (NC) contact are
provided. See Figure 5.14 for operating modes. The C440
may be optionally equipped with various communication
modules to allow remote functionality over Modbus, Device
Net, Profibus, and Eithernet IP communication protocols.
6. Eaton LV VSRs are equipped with 300:5 or 600:5 current
transformers as required by the continuous current
rating shown on the nameplate of the device. The current
transformer ratio and motor full load current must be
known to determine the proper FLA dial setting on the
C440 relay. That setting may be calculated by the following
formula:
Set Value = Equivalent FLA x (1/(CT Ratio)
Example: CT ratio is 300:5 300/5 = 60
Motor FLC is 120 amperes
Set Value = 120 x (1/60) = 2.0
The C440 FLA setting may also be determined from Table 6.
otee:
N
The overload relay allows trip settings that exceed the 425 ampere
continuous current rating of the LV VSR. Therefore, dial settings above 3.5
are not allowed.
7. Figures 5.10 and 5.11 are provided for setting assistance.
For the C440, the overload relay settings are the same
regardless of motor service factor.
otee:
N
The LV VSR is shipped from the Power Breaker Center with its over-
load relay set at the very lowest setting; the C440 must be properly set
before closing the device onto a motor load.
8. Figure 5.13 provides hot motor time-current information for
the C440.
Figure 5.13. Average Hot Trip Curve for Three Phase Motors
Figure 5.14. Operating Modes for C440
9. Eaton Instructional Leaflet IL04210001E provides additional
information on the C440 overload relay.
10. If the C440 overload relay trips after a motor overload
condition, access the relay through the removable front
clear polycarbonate cover, and press the reset button. The
device should only be reset after the condition causing the
motor overload is removed.
Table 6. C440 Overload Relay Dial Settings
Overload Relay Dial Settings FLA with 300:5 CT
FLA with 600:5 CT
1.00
60
120
1.25
75
150
1.50
90
180
1.75
105
210
2.00
120
240
2.25
135
270
2.50
150
300
2.75
165
330
3.00
180
360
3.25
195
390
3.50
210
420
3.75
225
Exceeds VSR Current Rating
4.00
240
Exceeds VSR Current Rating
4.25
255
Exceeds VSR Current Rating
Phase Imbalance Selection for C440
When a three phase load is powered with a poor quality line, the
voltage per phase may be unbalanced.
The effect of this if not protected results in unbalanced voltage
which causes large unbalanced currents. It can also lead to motor
stator windings being overloaded, causing excessive heating,
reduced motor efficiency and reduced insulation life.
If the OL relay is switched to the “ON” position, it will take the
starter offline if a phase drops below 50% of the other two phases.
5.4 INSERTION PROCEDURE
DANGER
ARC-FLASH INCIDENCES WITH LV SWITCHGEAR CAN OCCUR DURING
THE PROCESS OF INSERTING AND REMOVING LV-VSR DEVICES IN
SWITCHGEAR CUBICLES. IT IS STRONGLY RECOMMENDED THAT PROPER
PPE (PERSONAL PROTECTIVE EQUIPMENT) BE WORN BY PERSONNEL
WHO INSERT/REMOVE LV-VSRS.
