Dynalco MTH-103D User Manual

MTH-103D

Microprocessor-Based

Tachometer/Hourmeter/Trip

INSTALLATION AND

OPERATION MANUAL

3690 N.W. 53rd Street • Fort Lauderdale, FL 33309 U.S.A.

Phone [phone] • Fax [phone]

www.dynalco.com • [e-mail]

145F-11753.r3.050310_MTH-103Sinstallman

MTH-103D Installation and Operation Manual 1

Overview

This manual contains a general product description of the MTH-103D
Microprocessor-Based Tachometer/Hourmeter/Trip. It also supplies information
about the MTH-103D features, functional design, specifications, and configura­tion.

1.0 Product Description

The MTH-103D is a microprocessor-based 5-digit tachometer, hourmeter, and
trip. The trip can be programmed to activate on overspeed, underspeed (Class C),
or hours. The unit may be pickup or dc powered. The MTH-103D is approved by
the Canadian Standards Association (CSA). For further CSA requirements, refer
to drawings 80010401 on pages 11 and 12 of this manual.

1.1 Features

The MTH-103D tachometer provides the following features:

• Both signal and power can be derived from a magnetic pickup.

• High accuracy: 5-digit display; 1 RPM resolution; 100,000 hour range.

• Universal: Can be field calibrated with the single push button for any
number of pulses per revolution, trip point value, and preset/reset hours.

™

• Displays speed, hours, and the setpoint on command.

• Fast overspeed reaction time of 0.1 second (above 20 Hz input) is
independent of sensing gear teeth.

• Design incorporates hardware and materials creating a weatherproof
unit that allows installation in poorly protected areas. Display contrast
increases with increasing ambient light. This is ideal for both indoor and
outdoor installations.

• Standard Society of Automotive Engineers (SAE) case fits engine panels
with 3.5 inch (88.9 millimeter) openings.

• Unit is highly shock and vibration resistant. Face plate is gasketed and
spray proof.

• Unit is highly resistant to electrical noise.

1.2 Installation

The MTH-103D is designed for panel mounting either on or off the engine. If on
engine mounting is required, shock mounts are recommended. A 3.5 inch (88.9
millimeter) cut out in the panel is required for installation. A mounting clamp is
included with the meter.

2 MTH-103D Installation and Operation Manual

1.2.1 Terminal Connections and Dimensions

Figure 1–1, Terminal Connections and Dimensions

1.2.2 Specifications

The MTH-103D tachometer specifications are as follows:
Mounting: Panel mounted.
Power: Magnetic pickup or 9–30 Vdc.
Display: 5 active digits (0 to 99999), non-blinking liquid

Input Signal Frequency: From 10 to 13,000 Hz.

crystaldisplay (LCD), 0.4 inch (10.2 millimeter)
character height.

MTH-103D Installation and Operation Manual 3

Tachometer Accuracy: Quartz crystal-controlled, 1 RPM resolution,

within ±0.2% under all combined environmental
conditions.

Environment Temperature: Operating: –5ºF to +175ºF (–20ºC to +79ºC)

Storage: –40ºF to +195ºF (– 40ºC to +90ºC)

Vibration: Military Standard 810C, Method 514.2, Curve

P, to 500 Hz.

Hourmeter: 100,000 hour range (99,999), 1-hour incre-

ments. Display is visible and time accumulates
only when the signal is applied to terminals A
and B. Hourmeter accuracy is ±0.2% of reading.
The hourmeter retains counts in memory when
signal or power is removed.

Trip: Setpoint value is field-settable directly in RPM

or hours (count up or down). Normally open
solid-state contacts at terminals 5(+) and 6(–)
close on trip. Reaction time: 0.1 seconds.
Maximum continuous contact rating: 0.15 amps,
400 Vdc. Trip accuracy is ±1 unit maximum.

Weight: 1lb (0.454 kg).

1.3 User Interface

When the unit is powered up, the software version number of the MTH-103D will
be displayed for one second.

The version number is displayed as follows: X-YY. “X” is the major revision number
and “YY” is the minor revision number.

Use this version number when contacting the factory about any problems with this
unit.

The user interface of the MTH-103D provides two (2) modes of operation: the RUN
mode and the CONFIGURATION mode. A single push button (on the face of the
unit) is used to select the desired mode, display the various parameters, and
program the unit.

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