Eaton MES3800LSIG User Manual

Instructions for the Digitrip RMS 310 3 - Pole and 4 - Pole Trip Unit Installation
and Operation with L
- Frame and MDL - Frame Series C Circuit Breakers
Table of Contents
Description Page
1 .O General Information ............................................... 1
1.1
Protection .............................................................. 1
2.0
UL Listed Devices .................................................. 2
3.0
Installation ............................................................. 2
3.1
Preparation (All Trip Units) ..................................... 2
3.2
4 - Pole Trip Unit Installation ..................................... 2
3.3
Ground Fault Trip Unit Installation .......................... 3
3.3.1
General .................................................................. 3
3.3.2
Installation ............................................................. 3
3.4
3.5
4.0
4.1
4.2
4.3
4.4
5.0
5.1
5.2
5.3
5.4
5.5
5.6
6.0
6.1
6.2
3 - Pole (Non - Ground Fault) Trip Unit Installation ..... 5
Final Installation Instructions (All Trip Units) ........... 6
Principle of Operation ............................................ 6
General .................................................................. 7
Overload Trip ......................................................... 7
Short Delay/lnstantaneous Trip .............................. 7
Ground Fault Protection ......................................... 7
Protection Settings ................................................. 7
General .................................................................. 7
Short Delay Pick - up Settings ................................. 7
Short Delay Time Settings ..................................... 7
Instantaneous Pickup Setting ................................ 7
Ground Fault Pick - up Setting ................................. 7
Ground Fault Time Settings ................................... 8
Testing ................................................................... 8
Functional Field Testing ......................................... 8
Performance Testing for Ground Fault Trip Units .... 8
-
6.2.1 Code Requirements ............................................... 8
6.2.2
Standards Requirements ....................................... 9
6.2.3 General Test Instructions ....................................... 9
7.0 Rating Plug .......................................................... 12
8.0
References .......................................................... 12
8.1
Series C L - Frame Molded Case
Circuit Breakers
................................................... 12
8.2
Internal Accessories ............................................ 12
PRESENT BEFORE PROCEEDING WITHTHETASK,
AND ALWAYS FOLLOW GENERALLY ACCEPTED
SAFETY PROCEDURES.
MISAPPLICATION
OR MISINSTALLATION OF ITS
PRODUCTS.
CUTLER
- HAMMER IS NOT LIABLE FORTHE
The user is cautioned to observe all recommendations,
warnings, and cautions relating to the safety of personnel
and equipment as well as all general and local health and
safety laws, codes, and procedures.
The recommendations and information contained herein
are based on Cutler
- Hammer experience and judgement,
but should not be considered to be all
- inclusive or cover -
ing every application or circumstance which may arise. If
any questions arise, contact Cutler
- Hammer for further
information or instructions.
Fig. 1 Digitrip RMS 310 Trip Unit for 3 - Pole L - Frame &
MDL Frame Series C Circuit Breaker
1 .O GENERAL INFORMATION
A
A WARNING
DEATH, SEVERE PERSONAL INJURY, OR
SUBSTANTIAL PROPERTY DAMAGE CAN RESULT
FROM CONTACT WITH ENERGIZED EQUIPMENT. DO
NOT ATTEMPT INSTALL
OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT
IS
ENERGIZED. ALWAYS VERIFY THAT NO VOLTAGE IS
1.1 Protection
The Digitrip RMS 31 0, illustrated in Figure 1, is an elec -
tronic trip unit that incorporates a microprocessor - based
custom application specific integrated circuit design for
use with Series C L
- Frame and MDL Frame Molded Case
Circuit Breakers.
The Digitrip RMS
310 provides true RMS current sensing
for proper correlation with thermal characteristics of
conductors and equipment. Interchangeable rating plugs
Effective March 2003 Supersedes I.L. 29C615D dated July 1998 EATON
I.L. 29C615E
Courtesy of NationalSwitchgear.com

Eaton MES3800LSIG Specifications

General

Product Name	Eaton MES3800LSIG
Category	Industrial Electrical
Frame Type	MES
Trip Type	Electronic
Rated Current	800A
Number of Poles	3
Standards	IEC 60947-2
Mounting	Fixed
Connection Type	Screw Terminal
Operating Temperature	-20° to 70°C

Summary

General Information

Protection

Explains the electronic trip unit and its microprocessor-based design for RMS current sensing.

UL Listed Devices

Installation

Preparation (All Trip Units)

Outlines pre-installation steps for trip units, including inspection and wiring.

4-Pole Trip Unit Installation

Details the process for installing 4-pole trip units, including screw torque and connector alignment.

Ground Fault Trip Unit Installation

Covers the installation of ground fault trip units and the connection of neutral sensors and alarm relays.

3-Pole (Non-Ground Fault) Trip Unit Installation

Explains the installation for 3-pole non-ground fault trip units, including screw torque.

Final Installation Instructions

Provides concluding installation steps for all trip units, including barriers and covers.

Principle of Operation

General

Describes the Digitrip RMS 310's operation via a custom integrated circuit and microcomputer.

Overload Trip

Explains the overload trip function, including the 135% overload threshold and thermal memory effect.

Short Delay/Instantaneous Trip

Details short delay and instantaneous trip functions based on settings and I2t ramp.

Ground Fault Protection

Explains how ground fault protection is achieved through residual sensing and coordination.

Protection Settings

General

Guidance on setting protection parameters as specified by engineers, using rotary switches.

Short Delay Pick-Up Setting

Describes the seven available settings for short delay pick-up, as multiples of rated current.

Short Delay Time Settings

Explains short delay time settings, including I²t ramp and flat response options.

Instantaneous Pickup Setting

Details how to set the instantaneous pickup value, often by setting short delay time to 'I'.

Ground Fault Pick-Up Setting

Covers the five available settings for ground fault pick-up, corresponding to fixed ampere values.

Ground Fault Time Settings

Explains the available ground fault time delay settings, offering flat response options.

Testing

Functional Field Testing

Details using the built-in test receptacle with the STK2 Test Kit for trip functions.

Performance Testing for Ground Fault Trip Units

Outlines procedures and requirements for testing ground fault trip units per NEC and UL standards.

Rating Plug

References

Series C L-Frame Molded Case Circuit Breakers

Lists instruction leaflets for L-Frame circuit breakers and characteristic curves.

Internal Accessories

Lists available internal accessories and their corresponding instruction leaflets.