IC3600VDAC - Digital to Analog Converter Board

SPECIFICATIONS

Part Number: IC3600VDAC
Manufacturer: General Electric
Country of Manufacture: United States (USA)
Series: Mark I and II
Function: Variable Digital-to-Analog Converter

Functional Description

IC3600VDAC is a variable digital-to-analog converter developed by GE. It is part of the GE Speedtronic Mark I and II control system. The VDAC (Variable Digital-to-Analog Converter) card is a component in the digital setpoint system used for generating programmable analog signals. This card is essential for applications requiring precise speed or load control. It works in conjunction with the SSLD (Speed/Load Setpoint Logic and Drive) card and other associated control signals.

Features

• Counter and Converter: The card houses a 12-bit reversible counter that can count both up and down based on input signals. This counter's operation is controlled by the logic states of the ENAB, DN/UP, and CCP inputs. The ENAB input, when set to logic 0, enables the counter to either count up or down. The direction of counting is determined by the state of the DN/UP input. If DN/UP is logic 1, the counter counts down; if it is logic 0, the counter counts up. The CCP input provides a pulse rate signal that sets the rate at which the counter increments or decrements. This pulse train signal dictates the counting speed, influenced by the steering logic of the system.
• Output Signals: The card features a Digital-to-Analog (D/A) converter that generates an analog output voltage known as SAOUT. This output voltage can be adjusted to different full-scale ranges:
  
  • 0 to 10V: No jumper between SJA and SJB.
  • -5V to +5V: Jumper SJA to SJB.
  • The counter’s status is visually indicated by twelve LEDs on the card, which reflect the counter’s current output.
• Preset Capability: The card includes binary inputs (1MSB, IB2 through IB12) and a signal load for setting and clearing preset values. To configure the card, apply a logic 1 to the bits that need to be set and a logic 0 to those that need to be cleared. The settings are then loaded through a LOAD signal.
• Full and Empty Signals: Output signals MM1, MM2, and MM3 are used to indicate the status of the counter. When the counter is either full or empty, these signals will reflect a logic 1 based on the counter's state and external logic signals.
• Configuration Options: The card can be configured for different time periods required for travel from "counter full" to counter empty. This can be adjusted by using various jumpers or applying logic signals to specific inputs, allowing for periods of 12 minutes, 36 minutes, or 48 minutes, which can be further divided by 4, 6, or 8 times.
• Integration with Card: The D/A output from the card is connected to the SSLD card, which amplifies and processes the digital setpoint signal. The SSLD card provides signal inversion and gain adjustment through its operational amplifier and potentiometer adjustments.
• Comparator Function: The card also features a comparator circuit, comparing the digital setpoint signal from the VDAC with a reference signal. This comparator determines whether the input signal is less than or greater than the setpoint, with outputs indicating the result.

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FREQUENTLY ASKED QUESTIONS

What is IC3600VDAC?
It is a Digital to Analog Converter Board and is part of the GE Speedtronic Mark I and II gas turbine control system.

What is the primary function of the card?
The primary function of the card is to convert digital setpoints into programmable analog signals for speed or load control. It provides precise control by generating analog outputs based on digital inputs.

How does the card's counter work?
The card contains a 12-bit reversible counter that can count up or down. The direction of counting is controlled by the DN/UP input while the ENAB input must be set to logic 0 for counting to occur. The CCP input sets the rate at which the counter increments or decrements.

How does the card indicate the counter’s status?
The counter’s status is indicated by twelve LEDs on the card, which reflect the current output of the counter.