PRODUCT SPECIFICATIONS
SKF Multilog On-line System IMx-8/IMx-8Plus
SKF Multilog On-line System IMx-8/IMx-8Plus
User Manual
Revision E
o 4 mA constant current
o On/off control, individual per channel
• Impedance >100 kΩ
• Analogue input voltage range without damage to the IMx is ±28 V
3.2.4 Digital inputs
• Two digital inputs, non-isolated, referenced to chassis/enclosure ground
o Accepts positive voltages: up to 24V
▪ Contact SKF for advice if the digital signal may exceed +27 V
o Trigger level: 2.9 V, Hysteresis 0.1 V, Impedance 1.6 kΩ
• Can interface to:
o Common 2- or 3-wire speed sensors
o On-line oil debris sensor (Gastops MetalSCAN)
• 24 V DC sensor supply, maximum, peak demand up to 30 mA per channel
o Peak current demand from the sensor should be no greater than the
limit stated, even if the average demand (e.g. per shaft rotation
period) is less
3.2.5 Digital outputs
• Three relay driver outputs
• System status (RS), Warning and Alarm (R1 and R2)
• 24 V DC at 70 mA maximum, available (all, not per relay)
• Minimum individual coil resistances: 345 Ω (1 relay), 690 Ω (2 relays) and
1035 Ω (if 3 relays are in use)
3.2.6 Analogue measurement
• 24-bit A/D conversion
o Enables continuous data capture without gain or AC/DC switching
• One A/D converter for each channel
o Simultaneous measurements of all 8 channels (no multiplexing)
o Different channels can operate at different sampling rates
• Maximum sampling frequency: 102.4 kHz (though lower for event capture)
• Frequency range: from DC to 40 kHz
• Dynamic range: 120 dB
• Signal to noise ratio: 90 dB
• Crosstalk rejection: −110 dB (at 1 kHz)
• Amplitude accuracy: ±2% (up to 20 kHz), ±5% (20 to 40 kHz)
• Phase accuracy: ±3° (up to 100 Hz)
• Automatic detection of sensor fault and cable fault (software configurable)
3.2.7 Digital measurement
• Frequency range: 0.016 Hz to 20 kHz (1 cpm to 1.2 Mcpm)
o Note that when used for order tracking, the maximum pulse frequency
is 2.5 kHz
• Frequency accuracy: 0.05% of measurement value
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