EDI 244L Panduan Pengoperasian - Halaman 7

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Input voltage or pulse width does not meet the requirements of section 1.7.3 or

1.7.4.

Verify that the DC input voltage level is less than the DC Inputs True specification.

Verify that the DC input pulse width is greater than the Input Pulse Width Accept

specification.

1.6.2 TROUBLE SHOOTING SEQUENCE

Apply 24 Vdc nominal power to DC POWER pin J1-B referenced to LOGIC GROUND pin J1-

A. Connect a jumper circuit to the DC inputs J1-D (J1-J) and J1-E (J1-K) to simulate the

closure of the input contacts. The following signal measurements are referenced to test point

CH1 (CH2).

NOTE: internal test point "GND" is isolated from Logic Ground. Care should be exercised in

probing internal test points.

Input Bias Power Supply VCC

Voltage at test point VCC should be 19  1 Vdc with respect to GND.

Possible component faults are: controller U18, CR12, R14, transformer T1, CR30,

reference U25, or opto-coupler U21.

Regulated Power Supply VDD

Voltage at test point VDD should be 5  0.2 Vdc with respect to GND.

Possible component faults are: voltage regulator U26, inductor L2, diode CR29.

Microcontroller

Possible components at fault are: microcontroller U20.

Output Circuit

Output signals are processed by the microcontroller U20 and appear at U20.10

(U20.9) and on the display LEDs but are not appearing at the output pins.

Possible components at fault are: opto-coupler U8 (U9), transistor Q7 (Q8).

1.7 SPECIFICATIONS

1.7.1 MECHANICAL

Height ........................................................................................................4.50 inches

Width (242L) ............................................................................................... 1.2 inches

Width (244L) ............................................................................................... 1.2 inches

Depth (excluding handle) ......................................................................... 6.875 inches

1.7.2 ENVIRONMENTAL

Storage Temperature Range ................................................................. -45 to +85

Operating Temperature Range .............................................................. -34 to +74

Humidity Range (non-condensing) ................................................... 0 to 95% Relative

1.7.3 ELECTRICAL

DC Supply Voltage Minimum ......................................................................... 10.8 Vdc

DC Supply Voltage Maximum ........................................................................ 28.0 Vdc

DC Supply Power Maximum ......................................................................... 2.0 Watts

DC Inputs

True (low) ................................................................................... less than 8 Vdc

False (high) .......................................................................... greater than 12 Vdc

Optically Isolated Solid State Outputs

True (low, 50 mA) ..................................................................... less than 1.5 Vdc

False (high) .......................................................................... greater than 16 Vdc

Maximum Leakage Current (high) ................................................. less than 1 uA

Maximum Current ..................................................................................... 50 mA

Collector Voltage Maximum ......................................................................50 Vdc

Eberle Design Inc.

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