BECKWITH ELECTRIC M-2601, Инструкция

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M-2601/02/03 Instruction Book
3–14
3.4 Transient Protection
In the Autodaptive
®
Regulator Control, transient
voltages are suppressed by varistors.
Multiple VT grounds far apart must be avoided,
however, since a varying difference in ground
potential could add or subtract from the effective
potential and cause a variation in the voltage
setpoint.
3.5 External Connections
External connections are accomplished via a (12-
connection) terminal strip located on the rear of
the unit. See Figures 3-4, 3-8, and 3-12, External
Connections, for connection points.
Terminal 1 – Counter Input
This digital input registers the counter contact
closure. The operation count will increment when
terminal 1 is connected to neutral (terminal 7) or
disconnected from neutral through an external dry
contact. The counter is configured through
SLIMcom for X1 level sensing (G.E. regulators)
or X2-edge sensing (Siemens regulators) operation.
See Chapter 7 for details.
Terminal 2 – Load Current Polarity
The line current input range is 0–400 mA with
200 mA representing the nominal 1.0 per unit value.
The measured current value is used for line drop
compensation and metering calculations.
Terminal 3 – Load Current Return
This is the non-polarity input to the load current
measuring transformer. The companion polarity
input is terminal 2. The line current transformer
input is isolated from other terminals.
Terminal 4 – Neutral Position (Neutral)
This is the input to the Neutral side of the Neutral
Contact detection circuit. It is connected to the
Neutral Contact output of the Regulator.
Terminal 5 – Neutral Position (Hot)
This is the input to the Hot side of the Neutral
Contact detection circuit. It is connected to 120 V
ac via the harness.
Terminal 6 – Tapchanger Lower Output
This switched output connects the tapchanger lower
winding or an interposing relay to the source of
motor power. It is capable of switching up to 6 A
at 120/240 V ac.
Terminal 7 – Neutral
This is the return for the voltage input (terminal
9).
Terminal 8 – Tapchanger Raise Output
This switched output connects the tapchanger raise
winding or an interposing relay to the source of
motor power. It is capable of switching up to 6 A
at 120/240 V ac.
Terminal 9 – Motor Hold
This output is used only with Cooper Regulators.
It is left open for Siemens and GE Regulators.
Terminal 10 – Drag Hands Reset
This output is used to activate the Drag Hands
Reset mechanism. It is protected by F4, a 2 A
fuse.
Terminal 11 – Motor Power Input
The source for powering the tapchanger motor or
interposing relay is connected here. It may have
a nominal voltage of 120 or 240 V ac. This input
is protected by F1, a 6 ampere fuse. Direct cur-
rent may
not be switched through these contacts.
Terminal 12 – Voltage Input
This input accepts nominal 120 V ac, 60 Hz to
operate the control's power supply and voltage
sensing input. The acceptable voltage range for
proper control operation is from 80–140 V ac. Pow-
er consumption is 6 VA or less. The input voltage
is referenced to line neutral (terminal 3). This in-
put is protected by a 0.25 A fuse, F2. The unit
will withstand 1000 V ac hi-pot from neutral to
ground, since it is recommended that the VT neutral
be grounded at only one point.
See Figure 3-4 for typical external connections.
&
WARNING: Open CT secondary will result
in high voltage at CT terminals. Death, severe
injury or damage to equipment can occur. Do
not operate with CT secondary open. Short
circuit or apply burden at CT secondary dur-
ing operation.
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NOTES:
1. Motor voltage may be 120 or 240 V to neutral
or 240 V phase-to-phase.
2. The customer is to provide earth ground
connection to CT/VT's neutral connection,
external to the control.