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M-2299 Application Guide
4.0 M-2001 Tapchanger Control
Software Settings
Adjust the BANDCENTER setting to the nominal
voltage desired. Adjust the BANDWIDTH setting to
the desired voltage band, centered on the
Bandcenter setpoint, that the voltage must exceed
before timer and subsequent tapchanger operation
occurs. Adjust the TIME DELAY setpoint to a
sufficient amount to eliminate excessive tapchanger
operations. The LINE DROP COMPENSATOR
should be set for the line impedance from the
transformer to the load center. For further information,
obtain Beckwith Electric Application Note #17,
“
Basic Considerations for the Application of LTC
Transformers and Associated Controls
.”
4.1 M-0329 LTC Backup Control
Settings
The BANDCENTER and BANDWIDTH dials on the
M-0329 LTC Backup Control should be set so that
the Block Lower limit is a small amount
(approximately 2 V) below the lower band limit of
the Tapchanger Control, and the Block Raise limit
is a similar amount above the upper limit if line drop
compensation is not used.
If line drop compensation is used, the M-0329
Block Raise limit should be set at the maximum
voltage desired at the transformer secondary under
full load.
The M-0329 LTC Backup Control also includes a
deadband or runback function that regulates the
maximum voltage from the transformer. This “Lower”
function operates slightly above the Block Raise
limit and is connected to force the tapchanger to
lower the voltage if the upper limit is exceeded.
5.0 Test Procedures
Equipment Required
• 0–200 mA current supply with phase angle
settings of 0° to +90°
• 90–145 V ac voltage source at 60 Hz
• High impedance true RMS voltmeter with
accuracy on ac of at least ±0.2% of
reading
• Accurate Stop watch
Set-up Procedure
1. Make electrical connections as shown
in Figure 7, Test Procedure External
Connection.
NOTE: There is a one second delay between
out-of-band condition and panel LED indication.
2. Initial settings
sgnitteSlaitinI
retnecdnaBV0.021
htdiwdnaBV0.2
ecnatsiseRCDLV0.0
ecnatcaeRCDLV0.0
gnilellaraPdohteMtnerruCgnitalucriC
esiaRkcol
BV0.531
rewoLkcolBV0.501
dnabdaeDV0.2
remiTsdnoces0.5
Table 2 Initial Settings