Figure 4-4. Pn-150Be Relay Test Circuit - Hitachi PN-150BE Manual

f. Observe ammeter and adjust DC power supply output control to obtain the
charge current reading indicated in the Amps portion of the Charge column in
Table 4-1. Note that relay energizes and remains energized as voltage is
increased.
g. Set switch S1 to Reverse. Relay should deenergize.
h. Set switch S1 to Normal. Relay should again energize.
i. Adjust DC power supply output control to reduce the current at a rate so as not to
overshoot the actual value and measure the Drop-away, which is the value at
which the front contacts open (refer to Table 4-1 for acceptable value).
j. Further reduce the DC power supply output control setting at a rate so as not to
overshoot the actual value and check Minimum Drop-away with Full Back
Contact Compression (refer to Table 4-1 for acceptable value).
k. Reduce current to zero then open circuit momentarily using switch S2.
l. Adjust DC power supply output control to increase current at a rate so as not to
overshoot the actual value, and obtain Pickup, which is the value at which the
front contacts make. (Refer to Table 4-1 for acceptable values.)
m. Further increase the DC power supply output control at a rate so as not to
overshoot the actual value to obtain the relay Full Stroke value, which is the
value at which the armature is tight up to its stop pins. Frequently, Pickup and
Full Stroke will be the same value.
n. Test concluded. Disconnect test circuit, and return relay to service if it meets the
calibration values.
+
DC
POWER VOLTMETER
SUPPLY
_
Copyright 2019
PN-150BE Biased High Efficiency Vital Relay
AMMETER
S2
A
NORMAL
V

Figure 4-4. PN-150BE Relay Test Circuit

SM 4551L, Rev. 0 1, March 2019
S1
REVERSE
+A
RELAY
UNDER
TEST
-A
4-13