Faster - more Accurate - Field Programmable

The Tach-Pak 3 computing tachometer is a single channel instrument. It measures input frequency and converts the resulting quantities to a meter output, an analog output and four relays.

The microcomputer - based Tach-Pak 3 tachometer uses adaptive period averaging which permits a combination of fast response and high accuracy not available in other industrial speed instruments. The instrument functions can easily be programmed in the field or altered at any time using a unique internal switch design.

Typically, a Tach-Pak 3 tachometer is used with magnetic sensors as a signal source. However, it may receive a sine wave or TTL signal from any frequency source. The resulting speed is used for meter output, analog output or alarms. It is superior in applications requiring fast update times and high accuracy for equipment protection.

Features and Advantages

Quicker Response Time -50 millisecond updates above 100 Hz

Higher Level of Accuracy- ± .5% for analog outputs and ± .05% for relay setpoints in operation over temperature ranges.

Field Programmable - Adaptable to various applications and requirements by utilizing a unique internal switch design. No additional calibration equipment is required.

Digital Configuration - Utilizes adaptive period averaging and floating point calculations.

2 Analog Current Outputs- 0-1 mA. 0-20 or 4-20 mA.

4 Relays - Sealed 6 amp SPDT auto reset or latching.

AC or DC power - Adaptable to either AC or DC power source.

Applications

• Fast response overspeed shutdown
• PLC control input
• Petrochemical production applications
• Pump or generator alarm
• Low speed tachometer
• Expanding analog scale speed transmitter
• Start-up, over/under speed switching
• Textile Production applications
• RPM measurement
• Paper and pulp production
• Turbine speed control input
• Metal production
• Mining applications
• Frequency measurement
• Test labs
• Generator sets
• Food processing
• Conveyor protection
• Printing industry

Specifications Signal Input
Type: Software selectable for passive or active sensors & terminal block jumper for active sensors.

AC Input ( sine wave):
Input Impedance =2K ohms
Sensitivity @ 1KHz =200 mVrms
Max. Voltage Input =25 Vrms
CMRR =>40 db @ 1KHz, ref. to input threshold.

Pulse Input (TTL compatible):
Input Impedance =2K ohms
Min. Pulse Width =10µs
Logic 0 =V in < .5V
Logic 1 =V in >1.5V
(+12 VDC @ 50mA supplied for powered sensors)

Frequency Range: Upper limit 30 KHz. Lower limit software selectable 10 Hz to .0625 Hz.

Power Supply
120 Vac ±10%, 50-60 Hz
24 Vdc (23-30 V), std 750 ohm analog
load or (20-30 V) with 600 ohm analog load
15 watts maximum power.

Outputs
Meter Output: 0 to 1.0 mA ± .5% of full scale. True current 15 K ohm max. Full scale selectable from .1 Hz to 30 KHz.
Analog filter (approx. 2 sec.) switch selectable.

Analog Output: Selectable to 0 to 20 mA or 4 to 20 mA, ± .5% of full scale. True current 750 ohm max.
Full scale and zero scale selectable .1 Hz to 30 KHz
Analog filter (approx. 2 sec) switch selectable.

Relay Output: Four SPDT relays, 6 A @ 28 Vdc or 240Vac, 170 W or 1800 VA. Selective relay logic: Energize or deenergize above or below setpoint. Autoreset at setpoint with programmable frequency hysteresis 00.0% to 99.9% or with time delay hysteresis selectable 000 to 999 data acquisitions. Latching ( with remote reset) at setpoint or with time delay selectable 000 to 999 data acquisitions.

Response: 50 milisec. updates above 100Hz

Environmental
Temperature: -10°C to 55°C operating,
-40°C to 80°C storage

Vibration: Designed to meet MIL-810C, Method 514.2, Procedure VIII, and Figure 514.2-6. Curve V (1.5 g's 10-200 HZ)

Shock: Designed to meet MIL-810C, Method 516.2, Procedure I, Figure 516.2-2 for ground equipment (30 g's half sine).

Enclosure Available: Enclosed terminals, same mounting holes as the 300 tach with enclosure 50% wider. NEMA 4X and Explosion Proof enclosures optional..

Humidity: 90% relative and non-condensing.

Constant Storage: Retained in EAROM and may be altered 1000 or more times.

Electrical References: Circuit common is isolated from AC power, AC ground and case. DC Power, analog output and meter output are referenced to circuit common. Passive imputs are balanced. Active sensor inputs are referenced to circuit common.