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

The Model 1250B provides highly accurate, local & remote indication of load tap changer position and other difficult synchro-based position readings, now with improved communications options.

Applications/Options

Applications

For many years this versatile instrument has been a Utility and Industrial standard for measurement of:

  • Transformer Load Tap Charger Position
  • Works with virtually all transformer LTC's
  • Single Phase Voltage Regulator Position
  • Liquid Level
  • Machine Position
  • Thickness Gauging
  • Table Height

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

  • Provides absolute local & remote position feedback
  • Informs Dispatchers of LTC or Regulator position in real-time
  • Performs Non-Linear Conversion
  • Interfaces with PLC's and PC based SCADA systems
  • Addressable RS-485 Multi-Drop Communication
  • Full Duplex RS-232 Serial Communication

Features/Benefits

Features

  • Programmable via the Serial Port
  • Programmable Hi/Lo Relay Limits
  • Proportional Linear or Stepped Analog Output
  • ASCII or MODBUS Protocols
  • Highly Visible 5 Digit LED Display
  • Small size fits in 1/8 DIN panel cut-out
  • Highly Accurate over Multiple Turns

Benefits

  • Proven Reliability - many in operation for over 15 years
  • Maintenance Free
  • Can also be retrofit 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

1250B-U-W-X-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 = Control R - Hi/Low Relay Limits
X = Input Option I - Input Isolation
Y = Comm. Options S - RS-232
M RS-485 MODBUS
PB Parallel Data (BCD)
ZZZ = Line Voltage 120 (120 VAC) or 240 (240 VAC)

Data Sheet

Download Reference

PDF - Data Sheet (PDF)