DC to DC TRANSDUCER ISOLATING AMPLIFIER |
Datasheet (Adobe Acrobat Format)
Features:
Applications:
The transducer converts a DC voltage or current into a load independent DC current or voltage signal which may be used to drive a number of remotely installed instruments.
This transducer has been designed with a fast response for use in feedback circuits of motor drives. A lower ripple - slower response version for data loggers can be supplied.
The output is protected against over-voltages due to surges or accidental contact with insulation testers or the mains supply.
The auxiliary voltage supply is user selectable to either 110V or 220V AC by means of a jumper. A 24V or 110V DC version is also available.
The input signal is fed through a passive network (1) to scale it to a suitable value for the isolating amplifier (2). This amplifier has optically isolated input and output stages to give the necessary galvanic separation. The output amplifier (3) provides either a load independent current signal (with maximum burden) or a load independent voltage signal (with minimum burden). The auxiliary voltage is transformed in (5) and (6) and then rectified and smoothed in (4) and (7), thus providing each galvanically separate section of the transducer with its own auxiliary supply. The DC supply version has an inverter before the transformer section.
| 1. Input | |
| Input quantity: | Any value from 10µA to 10A or from 10mV to 600V DC (bipolar) |
| Input burden: | 1V for mA ranges 0.1V for A ranges 10kW/V for V ranges |
| Overload in terms of rated input: |
1.5x indefinitely 10x 0.5 seconds |
| 2. Output | |
| Characteristic: | A or B or C or D or E or F |
| Output quantity: | Current or voltage signal |
| Current standard values: | 1mA, 5mA, 20mA unipolar or bipolar |
| Maximum load: | 5k, 2.5k, 750 Ohm. |
| Voltage standard values: | 1V, 5V, 10V unipolar or bipolar |
| Minimum load: | 500 Ohm |
| Maximum output voltage: | 32V DC |
| Maximum output current: |
1.25x rated (typical) 2.0x rated (maximum) |
| Ripple: | 0.5% standard |
| Response time: | 0.2ms standard |
| 3. Auxiliary power supply | |
| Voltage: | |
| AC: | 110 or 220V ( User selectable ) 50Hz ±20% |
| DC: | 24V or 110V DC |
| Burden: | <3.5VA at rated output |
| 4. Accuracy | |
| Error limit at rated conditions: | ±0.5% of range |
| Linearity error: | 0.25% |
| Long term drift: | 0.25% |
| Temperature shift: | 400ppm/°C |
| Variation with auxiliary supply: | 0.05% for ±20% variation |
| 5. Protection | |
| Impulse test between isolated sets of terminals: | 4kV (0.5J 1.2/50 wave) IEC standard |
| Voltage withstand rating between sets of terminals: | 2.5kV 50Hz AC for 1 minute |
| Power voltage across output: | 220V 50Hz indefinitely |
| Surge across output terminals: |
5kV 25J 1kV 4J |
| 6. Physical constraints | |
| Working temperature: | -25 to 13 to 33 to 55°C |
| Storage temperature: | -55 to 75°C (above dewpoint) |
| Relative humidity: | 80% |
| Variation due to external magnetic field (worst case): | 0.05% at 400A/m 50Hz |
| Position: | Surface mounting in any position indoors. |
| 7. Enclosure | Type DIN A: |
| Type LDG6: |