Innotech Genesis II Digital Controller (v5) Manuel d'utilisateur télécharger pdf (Page 89)

Page 89

Genesis II Installation Instructions

The matrix below lists the expected voltages to be measured across a 500 Ohm resistance for the

various values of input current. For other resistor values use Ohm’s Law (V=IR) to determine the

voltage.

INPUT VOLTAGE

AISC CURRENT ACROSS 500 ohms

I05 0 – 5 mA 0 – 2.5VDC

I20 4 – 20 mA 2 – 10VDC

TD1 0 – 250 A 0 – 0.125VDC

TD2 0 – 500 A 0 – 0.25VDC

Inputs associated with the P20 AISC are 4 – 20 mA loop-powered inputs. These inputs cannot be

conveniently checked in the same manner as the other current inputs without applying power to the

Genesis II Digital Controller before it is safe to do so. Loop powered input wiring is checked by using a

voltmeter to ascertain that there is no stray voltage present at the input terminals. The input wiring

is then visually inspected for proper connection.

The following are procedures for performing current checks:

1. Ensure all AISCs have been removed and no power is applied to the Genesis II Digital Controller.

2. For analogue inputs associated with P20 AISCs go to Step 9.

3. Temporarily connect a 500-Ohm (or suitable value) resistor across the terminals of the first

current input channel to be checked.

4. Set a digital voltmeter to indicate VDC. Set the range for the expected voltage value shown in

the matrix above.

5. Connect the voltmeter across the analogue input terminals observing polarity. If necessary,

reduce the voltmeter range to obtain an accurate reading.

6. Ensure the measured voltage is within the expected range and of the correct polarity. If not,

check the analogue input wiring for faults/errors.

7. Remove the temporary resistor connected in Step 3. above. Repeat Steps 2 through 7 for the

remaining inputs associated with the AISC models noted above.

8. To check inputs for the P20 type AISC, connect a digital voltmeter across the input terminals. Do

not connect a resistor across the terminals. Reduce the voltmeter range to the lowest setting

practical. If voltage is present at the input terminals, it indicates a fault or improper wiring of

the input circuit.

9. Visually inspect the wiring of the P20 type analogue input. Ensure that all wiring conforms to

the associated wiring diagram. Ensure correct polarity is maintained throughout.

4-1.2.9 Resistance Checks

This paragraph contains procedures for checking analogue inputs associated with AISC Models TH1

through TH9. Checking these inputs consists of performing a simple continuity/resistance check.

Procedures for performing voltage checks are:

1. Ensure all AISCs have been removed and no power is applied to the Genesis II Digital Controller.

2. Set a digital volt-ohm-meter to indicate Ohms. Set the ohmmeter range to the resistance value

shown in Table 4-3.

3. Connect the volt-ohm-meter across the analogue input terminals.

4. Ensure the measured resistance is within the expected range. If it is not, check the analogue

input wiring for faults/errors

5. Repeat Steps 2 through 4 for the remaining inputs associated with AISC Models TH1 through

TH9.

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Innotech Genesis II Digital Controller (v5) Manuel d'utilisateur Page 89

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