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Other Product Specs
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Naztec MMU
516 Malfunction Management Unit
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The Naztec Model MMU 516 Malfunction Management Unit is an enhanced MMU that monitors up
to 16 traffic signal indications (channels) for conflict, improper sequencing, incorrect
timing, and improper signal voltage levels. The MMU 516 is fully compliant with NEMA
Standard TS2-1992. The MMU 516 is also capable of operating in older TS1 type cabinets,
and is compatible with 12-channel Conflict Monitor Units conforming to the NEMA Standard
TS1-1989.
All connectors, indicators and operator controls are
located on the front panel of the MMU 516. Channel and control input signals and relay
output connections are made through two MIL-C-26482 connectors, and the SDLC Port is an
A-size, 15 contact, D shell connector. The TS232 Port is excellent for tracking important
phase output data back to the controller or to a PC for logging. The programming card and
the AC line fuse are easily accessed from the front panel. |
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| The MMU
516 provides a Reset Timeout feature to prevent a broken switch or accidental wiring fault
from holding the unit in the reset state for an extended period of time. LED indicators,
in addition to the TS2 specified indicators, include Dual Indication Fault, Yellow+Red
Clearance Fault, Programming Card Ajar, Field Check (active channels do not match SDLC
message from controller) Fault, and LEDs for two +24VDC input faults and CVM input faults.
Status indicators provided include: AC Line Power, Type 12 Indicator, SDLC Transmitter
Active, and SDLC Msg Received. For added
safety, the MMU 516 performs continuous diagnostic tests during all operating modes. All
memory elements, the microprocessor, operating voltages, and critical circuitry are
checked. |
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Features
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Meets and exceeds all TS2
specifications |
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High Speed internal data transfer
and communications via an SDLC port |
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High speed external data transfer
via RS-232 port |
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Tri-Colour LEDs Red, Yellow, Green
for channel display |
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LED indicator lamps for operation
analysis |
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Removable program card |
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High performance machine tooled
sockets for integrated circuit mounting |
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Programming
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Minimum flash, 0-16 seconds |
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Short yellow per channel |
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Programmable sequence monitor |
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Latch selectable options |
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Indications
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Conflict LED |
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Red Fail LED |
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24 V-1 |
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24 V-2 |
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Controller Voltage Monitor |
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Red+Yel Clearance |
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Clearance |
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Diagnostics |
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Port 1 Fault, Tx, Rx |
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Program Card Ajar |
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Indication Fail LED |
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Field Check |
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Power LED |
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Type 12 Mode |
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Environmental
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Operating Temperature: -34º C to
+74º C |
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Storage Temperature: -45º C to
+85º C |
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Humidity: Less than 95%
non-condensing to +43º C |
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NEMA+
Features
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Meets and exceeds TS2-1992
Specifications |
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Operates in TS1 Cabinets |
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EPROM Memory/No batteries |
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Machine tooled socket I.C.'s |
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Programmable Minimum Flash Time |
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Latch 24 V Failures |
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Latch CVM Failure |
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Enhanced Monitoring |
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Electrical
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Power Line Voltage: 75 to 150 VAC,
RMS |
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Line Frequency: 57 to 63 Hz, 60Hz
nominal |
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Power Consumption: 10 watts,
typical |
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Fuse, Front Panel, 0.5A Slow Burn |
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Monitoring
Voltage
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Pickup: 96+/- 2.5 Volts AC, RMS |
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Dropout: 91+/- 2.5 Volts AC, RMS |
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Hysteresis: 4+/- 1.0 Volts AC, RMS |
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Dimensions
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Height: 10.5 inches |
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Width: 4.5 inches |
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Depth: 10.9 inches |
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