Type B Vital Relays - Alstom

Preventive Maintenance
4.5.2. AC Vane Relay Test
To test a two-element vane relay follow the procedure provided in Table 4–8. To
operate the text fixture see Appendix C.
Table 4–8. AC Vane Relay Test Procedure
Step
Procedure
1 Perform the visual inspection procedure in Table 4–3.
2 Connect the relay, meters and transformer, if required, to the Vane Relay Test
Unit.
LINE
EARTH
NEUTRAL
POWER
12 11
SW1
FUSE
2A
TP1
SW2
12
11
LINE/TRACK
POWER
Rs
FINE
100 OHMS
AC SUPPLY LINE
SW-1
POWER
ON
LINE/TRACK
POWER
Rp
COURSE
250 OHMS
R1
50 OHMS
22
21 SHUNT
12 11
SW3
SHUNT
11 12
SW4
CURRENT
VOLTS
COIL
2 ELEMENT VANE RELAY
COIL
VOLTS
CURRENT
– + + – – + + – – + + -
AMMETER
0-250 mA
VOLTMETER
0-150 VOLTS
11
14
12
13
LOCAL
R
TRACK
61
64
62
63
VOLTMETER
0-150 VOLTS
AMMETER
0-2 AMPS
LOCAL
TRACK
3 Carefully adjust supply voltage (a tapped transformer is one means) so that the
local element of the relay has the rated voltage imposed.
Stabilize relay for at least one hour before taking electrical values with nominal
voltage on the local element.
Make allowance for the voltage drop across the milliammeter. Obtain local
element readings.
4 Shunt the local milliammeter and adjust the local element voltage so that the
rated voltage is impressed. Hold this value constant during test.
5 No voltmeter is required for the track element, as DROPAWAY, DROPAWAY to
stop, PICKUP, and WORKING are expressed in current values.
6 While holding the voltage on the local element constant at its rated value and
with the relay in its normal position, vary the track element current by moving
the slider on the potentiometer or adjustable resistor. Determine the
DROPAWAY, DROPAWAY to stop, PICKUP, and WORKING current values for
the track element.
P1457, Rev. Nov/07 4–12 Alstom Signaling Inc.