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8. Slowly adjust Variac (T1) to decrease the output until all front contacts of the
relay open. Record the ammeter A reading; this is the drop-away (DA) current
value. It should be within the percentage range, as specified Table 3-1, of the
actual pick-up current value measured in Step 6.
9. Calculate the DA percentage of actual PU (DA%). It must be within the range
shown in Table 3-1 (DA% = Step 8 Value ÷ Step 6 Value ×100).
10. When the track energy is reduced to 1.7 volts or .028 amp, the vane must have
touched the lower roller stop.
* 115 VAC + 1%
CAN BE MAINTAINED
WITH VARIAC T2
Copyright 2019
Drop Away (DA) Current Value
115 VAC, 60 Hz
(ISOLATED LINE)
115 VAC + 1%
MIN.
(2F)
C2-
(10F) L-
RELAY UNDER TEST
(New Style Base Contacts Shown with Parentheses)
Old Style Base Contacts Shown without Parentheses
SM 4574F, Rev. 4, March 2019
__________
T2
ON
OFF
*
S1
V
2
MAX.
T1
R**
1500
25W
FOR
REFERENCE
ONLY
V
1
C1+
(1A)
(10E)
L+
PV-250 Track Relay
A
3-3
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