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EATON CORPORATION Cutler-Hammer
Information Sheets 70C1486H01
WARNING
ONLY CERTIFIED AND COMPETENT PERSONNEL
SHOULD ATTEMPT TO INSTALL OR MAINTAIN
POTENTIALLY HAZARDOUS EQUIPMENT.
DO NOT ATTEMPT TO INSTALL OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS
ENERGIZED. DEATH OR SEVERE PERSONAL INJURY
CAN RESULT FROM CONTACT WITH ENERGIZED
EQUIPMENT. ALWAYS VERIFY THAT NO VOLTAGE IS
PRESENT BEFORE PROCEEDING. ALWAYS FOLLOW
SAFETY PROCEDURES.
EATON IS NOT LIABLE FOR THE MISAPPLICATION OR
MISINSTALLATION OF ITS PRODUCTS.
1.0 General
Per the above WARNING, it is highly recommended that
maintenance be conducted on electrical equipment
including circuit breakers with the system de-energized.
For situations that arise where this is not possible, the
Maintenance Mode function of the Digitrip 1150ARM family
(cat. 11ARMLSI, 11ARMLSIG, 11ARMLSIA)
can reduce
Arc Flash incident energy that is generated on a fault
condition. This is accomplished by an analog trip circuit
which, when armed, provides a fast acting response to the
fault. The reduced arc condition will occur only in devices
downstream of the trip unit in Maintenance Mode.This is
separate from the normal system protection setting of
Instantaneous. The Maintenance Mode is located in the
“SYSTEM” submenu of the programmable settings menu
(PGM SET).
(See Appendix for screen details.)
CAUTION
OBSERVE ALL RECOMMENDATIONS, NOTES, CAU-
TIONS, AND WARNINGS RELATING TO THE SAFETY
OF PERSONNEL AND EQUIPMENT. OBSERVE AND
COMPLY WITH ALL GENERAL AND LOCAL HEALTH
AND SAFETY LAWS, CODES, AND PROCEDURES.
A FLASH HAZARD ANALYSIS SHOULD BE DONE TO
DETERMINE PERSONAL PROTECTIVE EQUIPMENT
REQUIREMENTS.
2.0 Maintenance Mode Settings
The Maintenance Mode Settings provide the Arc Flash
Reduction setting. 2.5 x Rating Plug Value is the Maxi-
mum reduction setting which correlates to the lowest
pickup value.
Available Trip current of Maintenance Mode Settings:
2.5 x Rating Plug Amperes
4.0 x Rating Plug Amperes
6.0 x Rating Plug Amperes
8.0 x Rating Plug Amperes
10.0 x Rating Plug Amperes
3.0 Arming Maintenance Mode
There are three ways to arm the Maintenance Mode Arc
Flash Reduction setting. One method is via the local
keypad located on the trip unit. The setting is located in
the “SYSTEM” submenu of programmable settings (PGM
SET). When the Mainternance Mode Arc Flash reduction
setting is enabled, the message “Maintenance Mode
Enabled”
is displayed to confirm that the function is on. If
any key is pressed, the Maintenance Mode message is
removed and replaced by normal display messages. If no
keys are pressed, the Maintenance Mode message will
reappear after 10 seconds.
For the second method, a remote switch wired through the
breaker secondary contacts can remotely arm the
Maintenace Mode setting. A high quality, gold plated or
palladium contact is required in this application.The
Maintenance Mode Enabled message will verify that the
function is armed.
(See wiring diagram on adjacent page.)
A third method to arm the maintenance setting is via a
communication device. A Palm Pilot along with an IR Mint
device can be employed to arm the setting. By initiating
the ENABLE setting, the Maintenance Mode selection in
the control screen of the Palm, Maintenance Mode is set.
There is a confirmation screen that verifies the arming. A
BIM (Breaker Interface Module) is another communcation
method to arm the setting. When Maintenance Setting is
enabled via device communications, this setting must be
disabled by device communications.
