Asco 920 - Manual Operation; Troubleshooting; Replacement Parts Kits

2
MANUAL OPERA TION
A means for manual operation is provided for mainte-
nance purposes only. The switch must be com pletely
de–energized. Open the supply source circuit breaker to
the A SCO 920. Label, tape, and disconnect the control
circuit wires from terminals L, 0,andC.
Do manually operate the RC Switch until all
power sour c es (serv ice & cont r ol) and all loads
are deenergized (open circuit breakers).
A slotted socket in the cover directly connects to the
solenoid operator mechanism. Use a medium blade
screwdriver to turn the socket 1/4 turn clockwise to
closeorcounterclockwisetoopen.SeeFigure2below.
insert screwdriver
turn clockwise to
close or counter-
clockwise to open
With all power OFF
Figure 2. Socket in nameplate for manual operation
ALL POWER MUST BE OFF
BEFORE TURNING !
TROUBLESHOOTING
Note any Optional Accessories that may have been
furnished with the ASCO 920 and review their operat ion.
Deenergize all power sources to the Remote
Con trol Switc h before work ing on it.
RC Switch opens and closes repeatedly.
1. Check Wiring. Make sure control stations are not
calling on the ASCO 920 to open and to close at
the same time. See Wiring Diagram.
2. Check Control Station. Make sure control
stations do not have overlapping contacts.
RC Switch tries to open or close, but cannot.
1. Check Voltage. Make sure control line voltage is
at least 90% of nameplate coil voltage.
2. Check Line Run & Wire Size. Make sure control
line size and distance is within the requirements of
TableA,page1.
3. Check VA Burden of Transformer. If a transform-
erisusedinthecontrolline,makesureitcanhandle
the VA burden required. See Table B, page 1.
REPLACEMENT PARTS KITS
For convenience, replacement contacts and coils are
sold in kit form. Select kits by noting switch ampere
size,numberofpoles,andcoilcontrolvoltageas
specified on the nameplate. The kits can be ordered
from any ASI, 1–800–800–ASCO. (2726).
For other parts, and service procedu res , refer to Servic e
Bulletin 381339–015. This publication is supplied with the
kits. When converting to a control voltage different from
originally fur n is h ed , reques t a new nam ep l ate .
Coil Kits for these AC Control Voltages
110–120 V 208–240 V 265–277 V 440–480 V
605326–001 605326–008 605326–002 605326–003
ASCO 920
Contact Kits
C
o
i
l
C
o
n
t
r
o
l
C
o
n
t
a
c
t
K
i
t
L
u
b
r
i
c
a
t
i
o
n
K
i
t
3
A
S
C
O
9
2
0
amp. size
2Pole 3Pole
C
o
i
l
C
on
t
ro
l
C
on
t
ac
t
K
i
t
L
u
b
r
i
ca
t
i
on
K
i
t
3
30–100 331709 331703
3
3
1
7
1
3
6
2
5
5
4
9
150–225 331710 331704
331713 625549
3
Lubrication points: core and link inside the core tube, operator spring, and rotating wei ght pin.