SDAC User’s Guide

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Watlow Controls

1241 Bundy Blvd., Winona, MN 55987

Customer Service

Phone: 1-800-414-4299

Fax: 1-800-445-8992

Technical Support

Phone: (507) 494-5656

Fax: (507) 452-4507

E-mail: [email protected]

Introduction

The Serial Digital-to-Analog Converter (Serial DAC) is an optional module for Watlow Anafaze Controllers. It allows the controller to output precision analog voltages or currents. The Serial DAC is typically used for precision open-loop control, motor or belt speed control, or phase-angle fired control.

This manual contains installation instructions, configuration information, and specifications.

Features

• Electrically isolated

• 0.003% resolution and linearity; factory calibrated to 0.05% accuracy for voltage outputs and 0.5% accuracy for current outputs. The Serial DAC can also be recalibrated to 0.1% accuracy on current output.

• User-selectable voltage or current output.

• Controller setup menus allow zero- and full-scale value adjustments within the Serial DAC’s 0 to

10V Î (dc) and 0 to 20 mA Î (dc) output ranges.

Installing the Serial DAC

You will need the following tools:

• Power drill with 4-mm (0.15-in) bits

• Screwdriver

• Four screws up to size #6 (up to 3.8 mm). Choose screws appropriate for your panel material.

• Wire strippers

To install the SDAC module:

1. Choose a wall or panel to install the Serial DAC.

For best results choose a location near the controller and in an area free from dust, excessive heat and moisture and unauthorized personnel.

2. Drill four holes for screw mounting. See Figure 1

on page 2 for mounting hole dimensions and placement.

3. Place the Serial DAC in its mounting location so that the screw holes in the Serial DAC line up with the holes you have drilled. Insert the screws in the holes and tighten.

4. Shut the system power off and wire the Serial

DAC to the controller and final control element.

Warranty

The Serial DAC is warranted to be free of defects in material and workmanship for 36 months after delivery to the first purchaser for use, providing that the units have not been misapplied. Since Watlow has no control over their use, and sometimes misuse, we cannot guarantee against failure. Watlow’s obligations hereunder, at Watlow’s option, are limited to replacement, repair, or refund of purchase price, and parts which upon examination prove to be defective within the warranty period specified. This warranty does not apply to damage resulting from transportation, alteration, misuse, abuse, or improper fusing.

Part No. 0600-2185-2000 Rev. 4.0

December 2004

WATLOW SDAC User’s Guide 1

4 mm (0.2 in.) diameter

44 mm

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91 mm

(3.6 in.)

76 mm

(3.0 in.)

8 mm

(0.3 in.)

10 mm

(0.4 in.)

Figure 1. Serial DAC Dimensions

119 mm (4.7 in.)

138 mm (5.5 in.)

WARNINGS

Ó

WARNING

The SDAC module is for indoor use only. To reduce the risk of fire or electrical shock, install in a controlled environment relatively free of contaminants.

Ó

WARNING

Use a power supply with a Class 2 rating only.

NOTE

Tighten screw terminal connections to 0.5 to 0.6 Nm

(4.5 to 5.4 inch-pound).

NOTE

Use copper conductors only.

Wiring the Serial DAC

The Serial DAC provides a robust analog output signal. The module converts the proprietary Serial DAC signal from the controller’s open collector output in conjunction with the clock signal to an analog current or voltage. See Figure 2 for wiring a Serial DAC. The

Serial DAC is user-configurable for voltage or current output. Refer to Figure 3 for configuration information.

The Serial DAC optically isolates the controller’s control output from the load. One Serial DAC may be powered by the 5V Î (dc) supplied by a CLS200,

MLS300 or CPC400 controller at its output terminal board. These controllers cannot provide sufficient current for more than one Serial DAC; use an external power supply.

Daisy chain up to

16 SDAC

Power Supply

+V1 (5V)

0

+V2 (15V)

COM

Controller Output

SDAC Clock

Control Output

Serial DAC

1 +5V In

2 COM In

3 CLK In

4 Data In

5 + Out

6 - Out

Load

–

+

Figure 2. Single or Multiple Serial DACs with External

Power

2 selectable. Refer to Figure 3. Configure the jumpers as indicated on the Serial DAC label.

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Figure 3. Voltage and Current Jumper Positions

WATLOW SDAC User’s Guide

Setup and Operation

Using the Serial DAC with a Controller

Complete the following steps to set up your Serial

DAC:

1. Check the Output Select jumpers on the Serial

DAC. Make sure that both jumpers are set for either voltage or current.

2. In the controller menus:

• Set the output type to SDAC (Serial DAC).

• Select the Serial DAC signal type: Voltage or

Current.

• Set the desired high and low output signal values.

The exact parameter names vary depending on the controller. See your controller manual.

Testing the Serial DAC

1. In the controller, select the loop to be tested.

2. Set the control output to manual mode.

3. Set a percent output level.

4. Use a volt or current meter to verify the output level of the Serial DAC.

Troubleshooting

The following section contains troubleshooting information for the Serial DAC.

Check the following first:

• Are the controller and Serial DAC wired and configured correctly?

• Are the inputs to the controller, such as thermocouples and RTDs, installed and working correctly?

Green Light on Serial DAC Does Not Light

Use a voltmeter to check:

• 5V power is present at the Serial DAC.

• Power is present at the controller.

Also, check data and clock line wiring, and make sure that the controller’s output type is set to Serial DAC for that loop.

Erratic and Incorrect Output Level

Check for reversed data and clock lines.

Output Level Incorrect, or No Output

• Check current and voltage jumper settings on the

Serial DAC.

• Check the controller’s voltage or current low and high output level settings.

• Make sure the Serial DAC data input is wired to the correct loop output.

Calibration Procedure

The standard Serial DAC is calibrated for precision voltage output. To recalibrate your Serial DAC to output currents with 0.1% accuracy, follow these steps:

NOTE

This procedure should be performed only by a technician familiar with calibrating electronic equipment. The voltage or current meter used should have the appropriate precision and be properly calibrated.

1. Remove the two plug-in terminals.

2. Unscrew either end panel.

3. Gently slide the card out.

4. Reinstall the plug-in terminals:

5. Recalibrate the circuit: a. Connect the voltage or current meter to the output.

b. Connect the Serial DAC to the controller.

c. Set the controller’s output to Manual Mode, 0%

Output.

d. Adjust the control labeled “zero” to get the desired output — typically 4.000 mA for current outputs.

e. Set the controller’s output to 100% output.

Adjust the control labeled “span” to get the desired full scale output (typically 20.000 mA).

f. Repeat steps c through f until you have achieved the desired accuracy.

6. Remove the plug-in terminal blocks from the

Serial DAC.

7. Gently slide the card back into the appropriate casing slot.

8. Screw on the end panel.

9. Replace the plug-in terminal.

Specifications

Watlow Anafaze offers a Serial DAC for precision open-loop control. The Serial DAC is jumper selectable for a voltage or current output. Multiple Serial DAC modules can be used with one controller.

The Serial DAC carries the CE mark.

Table 1. Serial DAC Environmental Specifications

Storage Temperature -20 to 60°C (-4 to 140°F)

Operating Temperature 0 to 50°C (32 to 122°F)

Humidity 10 to 95%, non-condensing

WATLOW SDAC User’s Guide 3

Table 2. Physical Specifications

Weight

Length

Width

Height

0.34 kg

138 mm

91 mm

44 mm

0.76 lb

5.5 in

3.6 in

1.8 in

Table 3. Agency Approvals / Compliance

CE Directive

UL® and C-UL®

Electromagnetic Compatibility (EMC) directive 89/336/EEC

UL916, Standard for Energy

Management Equipment, File E177240

Inputs

The Serial DAC requires a proprietary serial data signal and the clock signal from the controller. The Serial

DAC also requires a 5V Î (dc) power input.

Table 4. Screw Terminals

Wire Gauge

Screw Terminal Torque

24 to 12 AWG

0.5 to 0.6 Nm (4.5 to 5.4

inch-pound)

Table 5. Serial DAC Inputs

Parameter

Data

Clock

Description

4 mA maximum to DC COM

Open collector or HC CMOS logic levels

0.5 mA maximum to DC COM

Open collector or HC CMOS logic levels

Table 6. Power Requirements

Parameter

Voltage

Description

4.75 to 5.25V

Î (dc) @ 300 mA maximum

Analog Outputs

Table 7. Output Specifications

Parameter

Absolute Maximum

Common Mode

Voltage

Resolution

Description

Measured between output pins and controller common: 1,000V

Accuracy (calibrated for voltage output)

15 bits (plus polarity bit for voltage outputs)

(0.305 mV for 10V output range)

(0.00061 mA for 20 mA output range)

For voltage output: +/- 0.005V (0.05% at full scale)

For current output: +/ 0.1 mA (0.5% at full scale)

440 ppm/°C typical Temperature coefficient

Isolation Breakdown

Voltage

Current

1000V between input power and signals

Voltage

0 to 20 mA with 10V minimum compliance

(500 ohm load)

0 to 10V Î (dc) with 10 mA source capability

1 ms typical Output Response

Time

Update Rate Once per controller A/D cycle nominal.

Twice per second maximum for 60 Hz clock rate.

Output changes are step changes due to the fast time constant. All Serial DAC loop outputs are updated at the same time.

4 WATLOW SDAC User’s Guide