t
i(
TYPE RC AUTOMATI C RECLOSING RELAY
Lockout
When the drum reaches the lockout position, the
motor is de-energized, since c am contact #1 opens
(assuming the breaker is open). The breaker must
then be closed by the control switch. If the breaker
then remains closed the drum will rotate to the "Start"
position, where th e motor is de-energized by the #2
cam contact.
O pt i o n a l A rra ngements
Alternate operating arrangements are described
below.
Reclosing Through Contact Y6
As shown in figures 6 , 7 and 8 the close circuit
can be e nergized through contact Y6, where an in
dependent contact is required or where a reclosing
delay is desired. Y6 closes approximately 6 cycles
after 79X is energized .
Lockout Alarm
A #4 cam screw can be set to close the #4 con
tact in the lockout position. By j umpering terminals
4 and 6 and connectin g terminal 7 to an alarm cir
cuit, an alarm will b e sounded when the breaker
locks out.
Additional Instantaneous Tripping
Contact #4 can 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-overcurrent unit pickup. In this case
reestablishment of the instantaneous trip insures
breaker lockout if the fault current is near pickup
value. The instantaneous trip circuit can alternately
be reestablished e ach time th e Y unit
is reset
by
short circuiting the #14 contact with a jumper.
Selective One-Shot Instantaneous Reclosing
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
o btained. When the contact of the external device
closes, reclosing will occur in the sam e manner as
if #3 contact closed. Further reclosing by this means
can be prevented by using either the Y 1 3 and Y 1 4
contact circuit 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 fi gure
8
the Z unit is energized by
a 52b contact. Z unit contacts p erform the same
I.L.
41-661 C
functions as 52a and 52b contacts. The use of this
unit reduces th e number of control wires required.
Motor Operation from DC
An external inverter is available for operation of
the motor from either 1 2 5 or 250 volts de. Tlie DC
terminals of the inv erter are connected in place of
terminals 8 and 9 in figure 7. Terminals 8 and 9 are
then connected to the AC terminals of the inverter.
This arrangement permits 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 is:
Motor . . . . . . . . . . . . 1 20/240
V . ,
60 cycles
X and Y Units . . . . . . 1 20/240
v. ,
60 cycles
or 48/ 125
V.
D. C .
Z Unit (when used) . . . 1 2 5
V .
D. C.
Drum Speeds . . . . . . . 6Q-9Q-180-360
Sec . /Rev.
Where the motor is to be o perated at 240 volts a
resistor in the bottom right side is connected in
series with the motor coil. Relays are available for
operation o n 50 cycles. X
&
Y units can be supplied
for a minimum rating of 24 volts de, or with a 250
volt rating.
B u rden 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 79X)
Open position . . . . . . . . . . .
49
Y.
a.
Closed position . . . . . . . .
33 v. a.
Solenoid Unit
(Device 79Y)
Open position . . . . . . . . . . . 1 5 1 v. a .
Closed position . . . . . . . . . .
84 v. a.
Synch, Motor (Device 7 9M)
8.
5 v. a .
Auxiliary Unit (Device 79Z)
When used
Closed p osition . . . . 1 0 . 5 v. a. at 120
V
60 Cycle
3 . 5 watts at
1 25
V.
D. C .
The burdens o f the X and Y units occur only
momentarily during the reclosing cycle but the motor
is energized throughout the reclosing cycle . The X
and Y units can be energized for a 5 minute period
and the motor for a 15 minute period without injury .
The
Z
unit can
be
energized continuously .
9
www
. ElectricalPartManuals
. com
Содержание RC
Страница 14: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 15: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 30: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 31: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 51: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 66: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 67: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 82: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 96: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 97: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 112: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 113: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 114: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...