Redundancy

Optionally the SPC can be configured to accept redundant position commands and redundant servo position feedback signals. The SPC has accepts CANOpen or DeviceNet as the primary control signal while using 4–20 mA analog as a backup control signal. Upon failure of either signal, control will automatically switch to the healthy input signal. The SPC also has the capability to accept two servo position feedback signals and switch to the healthy feedback signal when one of the feedback signals fails.

Driver Specifications

Analog Position Input Demand:
Current Input: 4–20 mA (200-ohm input impedance)
Input Power:
24 V (dc) / (18 to 32) V (dc)

Actuator Drive Output (Configurable Options):
Bipolar Output with adjustable null current and the following configurable ranges:

• ±250 mA, ±100 mA, ±50 mA, ±25 mA, ±10 mA

Unipolar Output Current with the following configurable ranges:

• (0 to 250) mA, (0 to 100) mA, (0 to 50) mA, (0 to 25) mA

Dither: Adjustable current amplitude at a frequency of 25 Hz, and a duty cycle of 25 %

Position Loop Accuracy:
±0.25 % of full scale at 25 °C, temperature sensitivity of less than ±150 ppm/°C
CANOpen or DeviceNet:
Analog (4 to 20) mA: ±0.25 % of full scale at 25 °C, temperature sensitivity of less than ±300 ppm/°C

Position Sensing (2 Channels):
Voltage Feedback:
Accepts 3, 4, 5, or 6 wire LVDTs or RVDTs (single excitation driver), (0 to 12) V (dc), (12 to 0) V (dc)
Current Feedback:
Accepts (4 to 20) mA, (20 to 4) mA position transducer feedback signals

Relay Driver Outputs (Alarm & Shutdown):
Isolated FETs designed for direct control connection with or without interposing relays
Voltage Range: (18 to 32) V (dc)
Max Current: 500 mA, (10 µA leakage)

Environmental:
Operating Temperature Range: (–40 to +70) °C
Shock: US MIL-STD-810C method 516.2, procedure 1 (30 Gs, 11 ms half sine pulse)
Vibration: Lloyd’s Register Test Specification No.1, 1996, Vibration Test 1 (5 Hz to 13 Hz, ±1 mm, 13.2 Hz to 100 Hz, ±0.7 g)
Humidity: Lloyd’s Register Test Specification No.1, 1996, Humidity Test (48 Hr Cyclic – Condensing)
Size: (330 x 203 x 76) mm / (13 x 8 x 3) inches
Mounting: Bulkhead mounted
Ingress Protection: IP20

Pollution Resistance:
Particulate Pollution Resistance: IEC 664-1 Pollution Degree 2 (Normally only nonconductive pollution occurs. Temporary conductivity caused by condensation is to be expected.)
Gaseous Pollution Resistance: The polyacrylate conformal coating withstands NO₂, CO₂, SO₂, and H₂S gases per IEC 60068-2-60: 1995 Part 2.60 Method 1 and 4 (Flowing Mixed Gas Corrosion Test). It will withstand levels typical of telecommunications and computer installations as defined by Battelle Labs Class III (between IEC 60721-3-3 classification 3C1 and 3C2, light industrial to urban industrial, heavy traffic).