PRODUCT SPECIFICATIONS
SKF Multilog On-line System IMx-8/IMx-8Plus
SKF Multilog On-line System IMx-8/IMx-8Plus
User Manual
Revision E
47 (63)
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 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 i
n 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
