Tachometer/Overspeed Module Operates in High-Noise Environments


The V365 is an 8-channel single-width 6U height VME module specifically designed to acquire low frequency inputs from industrial speed sensors. The V365 can measure frequency and period over a wide dynamic range, and is specifically designed to ensure reliable measurement in high-noise environments. The V365 provides eight tachometer input channels, each including a differential input amplifier and programmable signal conditioning. Four independent programmable over speed blocks are provided and may be aimed at any selected channel. Each is programmable to trip on static or latched over speed or under speed conditions. Control provisions include relay polarity and startup override, and provision is made for self-test of the over speed facilities. The V365 can be connected directly to common transducer types, including variable reluctance or hall-effect magnetic speed pickups, AC line voltage or alternator windings up to 150 volts RMS, optical pickups, reed-switch or signal-conditioned fuel flow meters, contact closures, or other special levels. Two SMB signal monitor connectors allow for the analog and digital signal levels of any selected channel to be monitored at any time. A third SMB connector allows for internally or externally generated self test signals for in crate testing


• FUNCTION :8-channel pulse period measurement and overspeed module CONFORMANCE : Conforms with ANSI/IEEE 1014-1987 VMEbus spec; Meets VXIC VXI spec rev 1.4 for 'B'-size VXI module when used in A16 mode. PACKAGING :Single-width 6U Eurocard • DEVICE TYPE :16-bit VME register-based slave: A24:A16:D16:D08(EO); implements 32 16-bit registers at switch selectable addresses in the VME 16 or 24 bit addressing spaces. • INPUTS :Eight tach channels, numbered 0 through 7. Each channel has differential inputs, ground, and +12 volt source. Input impedance is > 60K to ground on differential inputs. Signal level inputs are configurable for standard TTL, open collector, AC generator, and variable reluctance sensor pickups. • Onboard signal conditioning includes VME-selectable gains, filtering/integration, and trigger levels to accept 100 millivolt to 150 volt RMS signals up to100 kilohertz.Inputs will tolerate 1000 volt transients for 50 us. • PERIOD MEASUREMENT RANGE :32 bits with 20 ns LSB resolution, approximately 85 seconds maximum period. Transparent interlock logic allows skew-free reading of 32-bit period data. • ACCURACY ± 0.005% +- 1 LSB • RS-232 PORT 9600 baud RS-232 diagnostic port provides alternate means of monitoring and configuration. A PC-compatible test/setup program is provided. • CONNECTORS DB37 female connector for signal inputs and current-limited +12 volt excitation outputs. HD15 female connector provides four SPDT relay contacts for overspeed/underspeed function.2.5 mm stereo phono connector for RS-232 serial port.Three SMB signal monitor connectors monitor analog and digital signal levels of any selected channel and access test signal frequency RELAY OUTPUTS Four isolated SPDT overspeed output relays, Fujitsu type FTR-B3. Contacts rated 1 A at 30VDC, 0.3 A at 120VAC, resistive loads. • INDICATORS Ten LEDs indicate processor heartbeat, VME access, and individual channel trigger activity.
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