Table of Contents
Advertisement
Set resistor R-2 to provide 0.013 ampere to pick-up stick relay. Momentarily close
switch "S" to position "1" to pick-up the Heavy Duty relay, which will be held energized
over its own front contact.
Then throw switch "S" to the position "2" to energize overload relay. By adjusting R-1,
set the "overload" current at the value specified in Table 4-2. At this current value the
operating relay should pick-up within 10% of the time value specified in Table 4-2. A
small adjustment of the operating time can be obtained by reducing or increasing the
distance between the turns of the thermal resistor.
REAR VIEW OF PN-152SO RELAY MOUNTING BASE
11C
HV+
12C
12B
HV-
"OPERATE"
A
D.C. AMMETER
R-1
NOTE: R-1 RESISTOR MUST BE
CAPABLE OF CARRYING
20 AMPS INTERMITTENTLY.
R-2 RESISTOR IS TO ADJUST
CURRENT TO 0.013 AMPS.
When the operating relay picks up, it energizes the stick relay, which in turn releases
the heavy-duty relay. When the heavy-duty relay drops out, it interrupts the overload
current circuit to the operate relay. (Heavy duty release interrupts the overload current
to the operate relay, which drops out.)
Successive tests of operating time must be made. Allow sufficient time for the thermal
resistor to return to room temperature between tests.
Copyright 2019
11A
DC+
12A
W
DC-
1
S
2
R-2
+
10 T0 12 V.D.C.
Figure 4-3. Final Calibration
SM 5929 Rev. 23, March 2019
PN-152SO Switch Overload Relay
"STICK"
A
D.C.
AMMETER
_
10 OR 12V
RELAY WITH 2
FROT CONTACTS
CAPABLE OF
INTERRUPTING
20 AMP AT
12VDC
1F
1H
12V
COIL
2F
2H
HEAVY
DUTY
RELAY
4-4
Advertisement
Table of Contents
