Eaton S811+T24 series - Appendix B-Protection; Thermal Overload Protection

Appendix B—Protection
S811+ Soft Starter MN03900001E—November 2012 55
Appendix B—Protection
Thermal Overload
The S811+ Soft Starter features an electronic motor overload
protection feature. This is intended to protect the motor and
power wiring against overheating caused by excessive
current for extended periods of time.
Note: Short circuit protection must be applied on the
line side of the soft starter.
Enter the motor full load current rating, using the Mtr
Nameplate FLA parameter in the Soft Start Config Menu to
program the trip current. It is programmable from 32–100%
of the unit’s rated current.
Overload—Adjustment Range—Inline Connected
Overload—Adjustment Range—Inside-the-Delta
Connected
Note: Mtr Nameplate FLA parameter is adjustable to any
point within its range.
The thermal overload is designed to protect the motor from
overheating caused by excessive current. If the motor is
overloaded, the current drawn rises and heats the motor. The
FLA sets the trip threshold and the trip class (5 to 30) is set
with the Ovrld Trip Class parameter.
If the device trips on a thermal overload, an internal timer is
started which inhibits a reset for three minutes. After this
timer expires, the device may be reset and the thermal fault
is cleared. At this point another internal timer is started, this
timer is 26 x 3 or 48 minutes. If another trip occurs before
this timer expires, the reset inhibit time is increased to
6 minutes.
Catalog
Number Min Max Default Notes
S811+N37… 11 37 11 Motor FLA parameter
must be set to motor
nameplate FLA to achieve
proper overload
protection
S811+N66… 20 66 20
S811+R10… 32 105 32
S811+R13… 42 135 42
S811+T18… 56 180 56
S811+T24… 75 240 75
S811+T30… 95 304 95
S811+V36… 112 360 112
S811+V42… 131 420 131
S811+V50… 156 500 156
S811+V65… 203 650 203
S811+V72… 225 720 225
S811+V85… 265 850 265
S811+V10… 312 1000 312
Catalog
Number Min Max Default Notes
S811+N37… 19 65 19 Motor FLA parameter
must be set to motor
nameplate FLA to achieve
proper overload
protection
S811+N66… 35 114 35
S811+R10… 55 182 55
S811+R13… 73 234 73
S811+T18… 97 311 97
S811+T24… 130 415 130
S811+T30… 164 526 164
S811+V36… 193 623 193
S811+V42… 227 727 227
S811+V50… 270 865 270
S811+V65… 352 1125 352
S811+V72… 389 1246 389
S811+V85… 458 1471 458
S811+V10… 539 1732 539