GE Multilin 469, Instruction Manual

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CHAPTER 1: GETTING STARTED
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 1–9
1.3 Changing Settings
1.3.1 Introduction
There are several classes of settings, each distinguished by the way their values are
displayed and edited.
The relay's menu is arranged in a tree structure. Each setting in the menu is referred to as
a settings, and each settings in the menu may be accessed as described in the previous
section.
The settings are arranged in pages with each page containing related settings; for
example, all the Short Circuit Trip settings are contained within the same page. As
previously explained, the top menu page of each setting group describes the settings
contained within that page. Pressing the
MESSAGE
keys allows the user to move between
these top menus.
All of the 469 settings fall into one of following categories: device settings, system settings,
digital input settings, output relay settings, thermal model settings, current element
settings, motor starting settings, RTD temperatures settings, voltage element settings,
power element settings, monitoring settings, analog input/output settings, two speed
motor settings, and testing settings.
Note
IMPORTANT: Settings are stored and used by the relay immediately after they are
entered. As such, caution must be exercised when entering settings while the relay is in
service. Modifying or storing protection settings is not recommended when the relay is
in service since any incompatibility or lack of coordination with other previously saved
settings may cause unwanted operations.
Now that we have become more familiar with maneuvering through messages, we can
learn how to edit the values used by all settings classes.
Hardware and passcode security features are designed to provide protection against
unauthorized settings changes. Since we will be programming new settings using the front
panel keys, a hardware jumper must be installed across the settings access terminals (C1
and C2) on the back of the relay case. Attempts to enter a new settings without this
electrical connection will result in an error message.
The jumper does not restrict settings access via serial communications. The relay has a
programmable passcode settings, which may be used to disallow settings changes from
both the front panel and the serial communications ports. This passcode consists of up to
eight (8) alphanumeric characters.
The factory default passcode is “0”. When this specific value is programmed into the relay
it has the effect of removing all settings modification restrictions. Therefore, only the
settings access jumper can be used to restrict settings access via the front panel and there
are no restrictions via the communications ports.
When the passcode is programmed to any other value, settings access is restricted for the
front panel and all communications ports. Access is not permitted until the passcode is
entered via the keypad or is programmed into a specific register (via communications).