ABB RELION REF615R, Technical Manual

Page: 98 / 664

If the
HOLD
input is set to TRUE and the Hold mode setting is “Disable”, rising edges on
the
SHIFT
input are ignored and all outputs are set to FALSE. When the
HOLD
input
returns to FALSE, the original output that was TRUE when HOLD was activated returnes
to TRUE unless the
RESET
input had been set TRUE or the Operation setting was set to
“Off”. The
SHIFT
input can again recognize rising edges. Figure 39 shows the operation
of the
HOLD
input with Hold mode setting set to “Disable”. Note that the
RESET
input
overrides the
HOLD
input by returning
O1
to TRUE after the
HOLD
input returns to
FALSE. The
RESET
input does not, however, override the ability of the Hold mode
setting in “Disable” to keep all outputs set to FALSE while the
HOLD
input is TRUE.
SHIFT
HOLD
RESET
O6
O7
O8
O5
O4
O3
O2
O1
GUID-AD3A74B3-C05D-43FF-8FB9-8F999D8E0261 V1 EN
Figure 39: Logic diagram with HOLD mode set to “Disable”
The
RESET
input is used for resetting the function. When this input is set to TRUE, the
presently asserted output
Ox
is set to FALSE and output
O1
is set to TRUE. Figure 40
shows the operation of the
RESET
input. When both inputs are TRUE, the
RESET
input
overrides the
HOLD
input (see Figure 38 and Figure 39 ).
Section 3
1MRS240050-IB C
Basic functions
92 REF615R
Technical Manual