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System Setup and Setpoints – 4
4–61
MANUAL TRANSFER SETTINGS/RESIDUAL
VOLTAGE TRANSFER TAB
Path:
System/Setup/Setpoints/Manual Transfer
Settings/Residual Voltage Transfer
The Residual Voltage Transfer tab (Figure 4-61)
displays the settings for the Residual Voltage
Transfer. The top right corner of the display includes
a command button that will disable or enable the
Manual
Residual Voltage Transfer. This selection
allows the
Manual
Residual Voltage Transfer to be
disabled (or enabled) independent from
Manual
Fast,
Delayed In-Phase and Hot Parallel Transfers.
Typically this feature is used to disable the other
types of transfers if needed.
Appendix F
, Time
Sequence of Transfer Logic includes the timing
diagrams of the Simultaneous and Sequential
Transfers. All transfers are enabled at the same
time and the decay of the motor bus voltage
determines which type of transfer is possible. This
feature allows the user to disable the individual
types of transfers if desired.
Manual Residual Voltage Transfer/Residual
Voltage Limit
The Residual Voltage Limit
can be set from 5 to 60
volts. When the motor bus voltage drops below the
Residual Voltage Limit the close command is sent
to the new source breaker. If Load Shedding has
been selected, then the Load Shedding Output is
closed when the motor bus voltage decreases to
less than the Residual Voltage Limit, then after the
Load Shedding Time Delay times out the close
command is sent to the new source breaker.
This setting cannot be disabled, it is always the
parameter used as the condition to execute a
Residual Voltage Transfer. There is no Time Window
for the Residual Voltage Transfer. However, it must
be completed by the Incomplete Transfer Lockout
Time Limit setting.
Manual Residual Voltage Transfer/Load
Shedding Time Delay
The Load Shedding Time Delay
can be set from 2 to
100 cycles. The time delay defines the time period
from when the motor bus voltage decreases to less
than the Residual Voltage Limit until the close
command is sent.
Manual Residual Voltage Transfer/Blocking
Inputs Selection
The Blocking Inputs Selection
button opens the
Blocking Inputs Selection dialog screen (Figure
4-62). Any Input or the Fuse Loss (FL) function can
be selected to block a Delayed Residual Voltage
Transfer.
When an input is selected, it is not grayed
out in other types of transfers.
Manual Residual Voltage Transfer Save/Cancel
The Save selection saves the Manual Residual
Voltage Transfer Tab settings either to an open file
or to the target MBTS. Cancel, returns the user to
the previous open screen.
The conditions that are necessary to execute a
Delayed Residual Voltage Transfer are:
•
No Lockout/Blocking conditions exist.
•
The conditions for a Fast Transfer have
not been matched.
•
The conditions for an In-Phase Transfer
have not been matched.
•
The motor bus voltage drops below the
Residual Voltage Transfer Limit setting
(adjustable from 0 to 60 V) within the
Incomplete Transfer Lockout Time Limit
setting (50 to 3000 cycles).
Summary of Contents for M-4272
Page 1: ...Instruction Book Book 1 of 2 M 4272 Motor Bus Transfer System ...
Page 45: ...xviii M 4272 Instruction Book This Page Left Intentionally Blank ...
Page 200: ...System Setup and Setpoints 4 4 89 Figure 4 93 ISSLogic Function Dialog Screen ...
Page 207: ...M 4272 Instruction Book 4 96 This Page Left Intentionally Blank ...
Page 214: ...Declaration of Conformity Appendix I I 1 IAppendix I Declaration of Conformity ...
Page 215: ...M 4272 Instruction Book I 2 This Page Left Intentionally Blank ...