S&C ELECTRIC COMPANY
s
INSTRUCTION SHEET
663-503
Page 11 of 35
August 14, 1995
Automatic Switch Operation
High-speed quick-make quick-break operation is provided
by stored-energy operators which, when solenoid tripped
in response to control signals from the S&C Micro-AT
Source-Transfer Control, automatically open and close
the Mini-Rupter Switches. After each trip operation, the
operators automatically charge when voltage is present
on the associated source—ready for the next operation.
For automatic switch operation, the manual/automatic
operation selector switch on the Micro-AT control must
be in “AUTOMATIC.” See Figure 2. The Micro-AT control
will not
function automatically if one operator is coupled
and the other is decoupled. Field programming and opera-
tion of the Micro-AT control is covered in S&C Instruction
Sheet 515-500.
Nonautomatic Switch Operation
If Control Power Is Available:
To manually operate the
stored-energy operator’s quick-make quick-break mecha-
nism—and (if coupled) to open or close a Mini-Rupter
Switch—place the manual/automatic operation selector
switch in “MANUAL” and press the associated open/close
pushbutton. See Figure 1. After each trip operation, the
quick-make quick-break mechanism automatically charges
when voltage is present on the associated source. The
charging operation takes approximately 25 seconds.
If Control Power Is Lost and Operator Is Charged:
To manually operate the stored-energy operator’s quick-
make quick-break mechanism—and (if coupled) to open
or close a Mini-Rupter Switch—insert the small keyed end
of the dual-purpose manual handle into the groove of the
tripping shaft, behind the cover labeled “EMERGENCY
TRIP,” and turn in the direction indicated to effect desired
operation. See Figure 6.
If Control Power Is Lost and Operator Is Discharged:
Manually charge the stored-energy operator’s quick-make
quick-break mechanism as described under “Charging
Operator (Nonelectrical)” below. Then proceed as just
described under “If Control Power Is Lost and Operator Is
Charged.”
Charging Operator (Nonelectrical)
The dual-purpose manual handle is used to manually
charge the stored-energy operator’s quick-make quick-
break mechanism (required only in the event that control
power has been lost). See Figure 7. Keep the charging-
shaft access port open by holding the operation selector
in the “CHARGING POSITION.” While the operation
MINI-RUPTER SWITCHES — Continued
Figure 5. Decoupler handle being
moved upward to decouple switch
from associated switch operator.
Figure 6. Dual-purpose manual
handle inserted in groove of shaft
for emergency manual switching if
control power is lost.
Figure 7. Dual-purpose manual
handle on the charging shaft.
