5-338
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
TRANSDUCER INPUTS/OUTPUTS
CHAPTER 5: SETTINGS
5
Hardware and software is provided to generate DCmA signals that allow interfacing with external equipment. Hardware
details are contained in chapter 3. The DCmA output channels are arranged in a manner similar to transducer input or CT
and VT channels. The user configures individual channels with the settings as follows.
The channels are arranged in sub-modules of two channels, numbered 1 through 8 from top to bottom. On power-up, the
relay automatically generates configuration settings for every channel, based on the order code, in the same manner used
for CTs and VTs. Each channel is assigned a slot letter followed by the row number, 1 through 8 inclusive, which is used as
the channel number.
Both the output range and a signal driving a given output are user-programmable via the following settings menu (an
example for channel M5 is shown).
The relay checks the driving signal (
x
in equations below) for the minimum and maximum limits, and subsequently re-
scales so the limits defined as
MIN VAL
and
MAX VAL
match the output range of the hardware defined as
RANGE
. The
following equation is applied:
Eq. 5-59
where
x is a driving signal specified by the
SOURCE
setting
I
min
and I
max
are defined by the
RANGE
setting
k is a scaling constant calculated as:
Eq. 5-60
The feature is intentionally inhibited if the
MAX VAL
and
MIN VAL
settings are entered incorrectly, for example when
MAX VAL
–
MIN VAL
< 0.1 pu. The resulting characteristic is illustrated in the following figure.
Figure 5-192: DCmA output characteristic
Settings
DCMA OUTPUT H1
MIN VAL: 0.000 pu
Range: –90.000 to 90.000 pu in steps of 0.001
DCMA OUTPUT H1
MAX VAL: 1.000 pu
Range: –90.000 to 90.000 pu in steps of 0.001
Summary of Contents for M60
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