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Tools and Kits<br />
The vane relay test unit's circuit, meter connections, and vane relay connections are<br />
shown in Figure C–4. The unit can be powered form a variable 120 VAC source or the<br />
user can add a tapped transformer to adjust the supply line to the current LOCAL<br />
winding voltage. The user provides the ammeters and voltmeters for measuring the<br />
vane relay's DROPAWAY, PICKUP, and WORKING currents and voltages. Two<br />
potentiometers and series resistance control the current and voltage to the controlled<br />
element of the vane relay under test. Potentiometer Rp is 250 ohms and potentiometer<br />
Rs is 100 ohms, both are non-inductive resistances. Rp is connected directly across the<br />
supply line and Rs is connected as a variable series resistance. Rp gives a coarse wide<br />
range adjustment, and Rs gives a fine adjustment, to be used near the DROPAWAY,<br />
PICKUP, and WORKING values of the relay.<br />
POWER<br />
FUSE<br />
2A<br />
LINE<br />
EARTH<br />
NEUTRAL<br />
12 11<br />
SW1<br />
TP1<br />
SW2<br />
12<br />
11<br />
LINE/TRACK<br />
POWER<br />
Rs<br />
FINE<br />
100 OHMS<br />
AC SUPPLY LINE<br />
SW-1<br />
POWER<br />
ON<br />
LINE/TRACK<br />
POWER<br />
Rp<br />
COURSE<br />
250 OHMS<br />
R1<br />
50 OHMS<br />
22<br />
21<br />
SHUNT<br />
12 11<br />
SW3<br />
SHUNT<br />
11 12<br />
SW4<br />
CURRENT<br />
VOLTS<br />
COIL<br />
2 ELEMENT VANE RELAY<br />
COIL<br />
VOLTS<br />
CURRENT<br />
– + + – – + + – – + + -<br />
AMMETER<br />
0-250 mA<br />
VOLTMETER<br />
0-150 VOLTS<br />
11<br />
14<br />
12<br />
13<br />
LOCAL<br />
R<br />
TRACK<br />
61<br />
64<br />
62<br />
63<br />
VOLTMETER<br />
0-150 VOLTS<br />
AMMETER<br />
0-2 AMPS<br />
LOCAL<br />
TRACK<br />
Figure C–4. Vane Relay Test Unit Circuit with Relay<br />
P1457, Rev. Nov/07 C–7 <strong>Alstom</strong> Signaling Inc.
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