Figure 3-1. Ac Vane Relay Test Circuit; Table 3-1. Shop Test Operating Values @ 70-74°F; Table 3-2. Operating Values At Ideal Phase Relations - Hitachi PV-250 Installation Operation & Maintenance

Track relay 60 hz, 115-volt local

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Table of Contents

** The resistance value of R is selected to ensure that when the Variac is set to its

Maximum setting the value of current, as measured on meter A, is approx. 10% higher

than the maximum Full Stroke current. For the purposes of this test circuit the resistor

is fixed, however, it can be a potentiometer and set to a value that permits a 10%

higher than the maximum Full Stroke current value.

Table 3-1. Shop Test Operating Values @ 70-74°F

Vane Torque

(Inch Grains)

Volts

(for ref. only)

325

2.9 – 3.3

Table 3-1 values represent nominal calibration values ± 5%. See Table 3-3 for

Note:

In-Service and Field Calibration Operating Values.

The digital ammeter should be set to display to only three decimal places. Values beyond

∗

three decimal place accuracy are insignificant to the calibration and should be ignored.

When the track energy is reduced to 1.7 volts or .028 amp, the vane must have touched

the lower roller stop. The values in

3-1

Table

are 13% higher than ideal and apply to test from single-phase supply with

∗

resistance in series with the track winding.

It's recommended that relays be taken out of service if the Drop-Away falls below the value

shown for field test.

Shop Test operating values may be affected by fluctuations

of local voltage, temperature, and test equipment being

used.

Table 3-2. Operating Values at Ideal Phase Relations

(Values shown are for technical use and for calibration tag information only.

Pick-Up (PU)

Volts

2.60 – 2.88

Note: Table 3-1 values represent nominal calibration values ± 5%.