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CARLO GAVAZZI Instruments
SPT-90
16-bit µP-based modular smart power transducer
rev. 1
Operating instructions
Important:
We suggest you keep the original packing for a further shipping of the
instrument.
In order to guarantee a correct use of the transducer, we recommend the
user to carefully read the present instruction manual.
GENERAL FEATURES
The most important features are:
• Only two basic models
• TRMS measurements
• 5 input ranges
• Connections to CT and VT, full range CT and VT ratio programming
• Measurements of W, Wavg (programmable from 1 to 30 minutes), VA,
var, (power factor) cos
ϕ
, Wh, VAh, varh, Amax (among the phases),
Vdelta avg, VL
1
-N, VL
2
-N, VL
3
-N, Hz L
1
• Outputs: 20mA, ±5mA, ±10mA, ±20mA, 10V, ±1V, ±5V, ±10V (all with
scaling), DC pulse (programmable pulse for kWh, KVAh, kvarh), serial
RS485 (MODBUS/JBUS), RS232 and alarm set-point.
The main programming parameters are:
• Programming of the password
• Selection of the electrical system
• Programming of CT and VT ratio
• Programming of analogue and serial outputs (when present)
• Selection of energy measurement (if the pulse output is available)
• Programming of the output working
• Programming of the digital filter
• Programming of the power integration time (Wavg).
TECHNICAL FEATURES
BASIC ACCURACY (VOLTAGE/CURRENT): 0.5% F.S.
BASIC ACCURACY (POWER/ENERGY): 0.5% F.S.
TEMPERATURE DRIFT: analogue output: 300ppm/°C
serial output: 200ppm/°C
RIPPLE:
≤
1%