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Model 1250-LTC:
Synchro (Selsyn ®) - Rotary Position Indicator

The Model 1250-LTC provides critical LTC Maintenance Data to assist in making informed decisions, while continuing to provide highly accurate local and remote indication of load tap changer position.

Applications/Options

Applications

  • Transformer Load Tap Changer Position
  • Works with virtually all transformer LTC’s
  • Single Phase Voltage Regulator Position

Options

Model 1292 - Synchro Transmitter
Model 1292K - Transmitter w/bracket
Model 1292KS - Transmitter w/bracket and surge protection circuit
Model 1293 - Flexible coupling shaft
Model 1945 - 15 VDC Loop Power Supply (For 4-20 mA Analog Output)
Model 1280 - Surge Protection Module
Model RD-4 - Remote Display

Capabilities

Capabilities (most can be alarmed)

  • Provides absolute position feedback
  • Tap Change Displacement (position variation, 0.1 degree resolution)
  • Total Operations Count
  • Number of Tap Changes “up to” or “down to” each Tap
  • Number of Consecutive Tap Changes in one Direction
  • Number of Days Since First or Last Change to Highest and Lowest Tap (Draghands)
  • Number of Days Since Passing Through Neutral
  • “Unstable Signal” and loss of signal detection
  • Momentary Relay Acknowledgement at Each Tap Change
  • High Tap and Low Tap Alarm Limits

Features/Benefits

Features

  • Interfaces with PLC’s and PC-Based SCADA systems
  • Elapsed Time Clock
  • Full Duplex RS-232 Serial Communication or Addressable RS-485 Multi-Drop Communication
  • Programmable via the Serial Port
  • 2ea, Form A Dry Contact Relays
  • Proportional Stepped Analog Output
  • ASCII or MODBUS Protocols
  • Highly Visible 5 Digit LED Display
  • Small size fi ts in 1/8 DIN panel cut-out

Benefits

  • Proven Reliability – many in Utility & Industrial operations for over 20 years
  • Maintenance Free
  • Can be retrofi ted to older LTC’s with existing synchros
  • Easy Installation and Programming
  • Flexible Communication Options

Specs

Specifications


GENERAL
Input Signal Synchro (5 wire) 90V maximum
Resolution +/-0.001% of full scale or 6 arc minutes
Accuracy +/-0.02% of full scale maximum (.01% typical)
Temperature Drift +/- 0.01% per °C
Operating Temperature  0° to 55° C (standard)
Humidity 10% - 90% non condensing
Weight 24 ounces
Voltage 117/234 +/- 10%
Frequency 47 - 63 Hz
Load 8 Watts, maximum
DISPLAY
Type 5-digit LED
Digit Height 0.56 inch (14.2 mm)
Viewing distance 23 feet
Decimal point Field programmable (scaled modes only)
OPTIONAL ANALOG OUTPUT
Outputs +/- 1 mA, 0-1mA, 0-2mA, 4-20mA (requires external loop power)
Compliance 10 Volts (0-1mA, +/-1mA, 0-2mA)
500 Ohms (4-20mA)
Non-Linearity +/- 0.1% of full scale
Resolution 12 bits (+/- 0.025% of full scale)
OPTIONAL HI/LO RELAYS
Contact Rating 3A @ 125/250 VAC (resistive), 30 VDC



Panel cut out min.: 1.653 (42mm) x 3.543 (90mm)
(+2 / -0 mm)

Panel thickness: 0.1 (2.7mm) to 0.19 (5.0mm)

Order

Ordering Information

1250-LTC-U-W-Y-ZZZ = options, see below
OPTIONS
U = Output Options 0 (0-1 mA) 2 (0-2 mA)
1 (±1 mA) 4 (4-20 mA)
W = Relay/Isolation Options R - Relay Limits
I - Input Isolation
Y = Comm. Options S - RS-232
M - RS-485 MODBUS
ZZZ = Line Voltage 120 (120 VAC) or 240 (240 VAC)
* 4-20 mA requires external loop power or Model 1945

Data Sheet

Download Reference

PDF - Data Sheet (PDF)