Electrical Control - Eaton FP-25-LV-VSR Instruction Book

FP-25-LV-VSR
Breaker-To-Motor Starter Conversion

4.1 Electrical Control

Specific wiring schematics are included with each LV-VSR. A typical
wiring schematic is depicted in Figure 4.2.
Figure 4.2. Typical Wiring Schematic.
There may be different control voltages or more than one tripping
element, but the principle mode of operation is as follows.
If control power is present, and the LV-VSR is in either the TEST or
CONNECT position, then the LV-VSR may be closed.
The LV-VSR may be closed by making the control switch close (CS/C)
contact. The LV-VSR may be opened any time by making the control
switch (CS/T) contacts.
Note the position switch (PS1) contact in the closing circuit. This
contact remains open while the LV-VSR is being levered between
the TEST and CONNECT positions. Consequently, it prevents the
LV-VSR from closing automatically, even though the control close
contact may have been made while the LV-VSR is levered to the
CONNECT position.
When the CS/C contact is made, the MR1 closes the LV-VSR. If
the CS/C contact remained after the LV-VSR closes, and trip single
is sent, the T-relay contact will close and pick up the Y-relay. The
Y/a contact will seal in the Y-relay until the CS/C contact is released.
Even though the LV-VSR would open, it could not be reclosed before
CS/C was released and remade and no trip single was present. This
is the anti-pump function.
The LV-VSR will also open if there was an overload condition that the
overload relay sensed. The LV-VSR will not close until the overload
relay is reset after an overload condition.
The LV-VSR will also open if a fuse blown or opens. The LV-VSR will
not close until the blown or open fuses are replaced.
Instruction Book IB019008EN October 2016 www.eaton.com 11