t
TY P E RC AUTOMATI C R ECLOSING R ELAY
Lo ckout
When the
drum
reac hes the lockout position , the
motor is de-energized, since c am contact #1 opens
( as suming the breaker is o pen). The breaker must
then be closed by the c ontrol switch. If the breaker
then remains closed the drum will rotate to the "Start"
position, where the motor is de-energized by the #2
c a m
contact.
A rra ng e m e n ts
Alternate operating arrangements are described
belo w.
Reclosing Through Contact Y6
As shown in figures 6 , 7 and 8 the close circuit
c an be energized through contact Y 6 , where an in
dependent contact is requi red or whe re a reclosing
delay is desired. Y6 clo ses approximately 6 cycles
after 79X is energized.
Lockout Alarm
A #4 c am scre w can be set to close the #4 c on
tact in the lockout position. By jumpering terminals
4 and 6 and conne ctin g terminal 7
to
an alarm cir
cuit, an alarm will be s ounded when the breaker
locks out.
Additional Instantaneous Tripping
Contact #4 c an be set to reestablish the instan
taneous trip circuit after the last reclosure and prior
to lockout, if the instantaneous trip pickup is about
equal to the time-overc urrent unit pickup. In this c ase
reestablishment of the instantaneous trip insures
breaker lockout if the fault current is near pickup
value. The instantaneous trip circuit c an alternately
be reestablished e ach time th e Y unit is reset by
short circuiting the # 1 4 c ontact with a jumper.
Selective One-Shot Instantaneous Reclo sin g
BY
eliminating the #3 cam in the start position
and by using terminals 16 and 17 with an external
device, selective , instantaneous reclosing can be
obtained. When the contact of the external device
clo ses , reclosing will o c cur in the same manner as
if #3 contact closed. Further reclosing by this means
can be prevented by using either the Y 1 3
and 1 4
contact c ircuit o r b y using the # 4 contact circuit.
In the latter case, the #4 cam is set for contact clo
sure in the start position.
Relays with
Z
Unit
As shown in figure 8 the
Z
unit is energized by
a 52b contact.
Z
unit c ontacts p erform the same
I. L.
4 1 -66 1 E
functions a s 52a and 5 2b contacts . The use o f this
unit reduces the number of control wires required .
Motor Operation from DC
An e xternal inverter is available for operation of
th e motor from either 125 or 250 volts de . Ttie DC
terminals of the inv erter are c onnected i n p lace of
terminals 8 and 9 in figure 7. Terminals 8 and 9 are
then conne cted to the AC terminals of the inverter.
This arrangement p ermits the use of an intermittently
rated inverter, since the DC terminals are not continu
ously energized .
C H A R A C T E R I S T I C S
The standard rating for the relay i s :
Motor . . . . . .
X and Y Units
Z
Unit (when used) .
Drum Speeds . . . . .
. 1 20/ 240
V. ,
60 cycles
. 120/ 240
V . ,
60 cycles
or 48/ 125
V.
D. C.
. 125
V.
D . C.
. 6G-9G- 180-360
Sec . /Rev.
Where the motor is to be o perated at 240 volts a
resistor in the bottom right s ide is connected in
series with the motor coil . Relays are available for
operation o n 50 cycles . X
&
Y units c an be supplied
for a minimum rating of 24 volts de, or w ith a 250
volt rating.
B urde n D a ta
The maximum burdens for the various units of the
standard RC relay w hen energized from a 1 20
V.
60
cycle supply are listed below :
Contactor Unit (Device 7 9X)
Open position . . . . . .
49
v.
a.
Clo sed position . . . . .
33 v. a.
Solenoid Unit (Device 7 9Y )
Open position . . . . . .
1 5 1 v. a .
Closed position . . . . . . . . . .
84 v. a.
Synch, Motor (Device 7 9M) 8 . 5 v. a .
Auxiliary Unit (Device 7 9Z)
When used
Closed position . . . . 1 0. 5 v. a. at 1 20
V
60 Cycle
3 . 5 watts at
125
V.
D. C .
The burdens o f th e X and Y units occur only
mome ntarily during the reclo sing cycle but the motor
is energized throughout the reclosing cycle . The X
and Y units c an be e nergized for a 5 minute period
and the motor for a
15
minute period without injury .
The Z unit can be e nergized continuously .
9
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