Operator Adjustments; Spring Charging Adjustment - Siemens SDV-4A Instruction Manual

Operator Adjustments

Hazardous voltages and high-speed
mechanical parts.
Will cause death, serious injury or property
damage.
Read instruction manuals, observe safety
instructions and limit use to qualified
personnel.
The following adjustments are not required during routine
maintenance of the breaker. These adjustments should be
considered if:
1. The spring charging motor runs but does not advance
the ratchet wheel (springs do not charge).
2. The breaker does not close and open in a normal man-
ner and electrical control check out is satisfactory.
Before these adjustments can be made, the front panel of
the operator must be removed to gain access to the adjust-
ment points of the mechanism.
Spring Charging Adjustment - Figure 27
1. Remove the spring charging motor.
2. Install a 1/2 inch drive extension and ratchet wrench in
the eccentric drive shaft.
3. Rotate the eccentric shaft until the eccentric is at its maxi-
mum inward position.
4. Adjust the hex socket set screw (66) until the driving
surface of the upper pawl is approximately 0.031 inch
from the face of the ratchet tooth.
5. Mount the spring charging motor and operate the charg-
ing system electrically. Adjust the hex socket set screw
(66) until the ratchet moves with minimum noise.
6. Lock the set screw in position using the lock nut.
This completes the adjustment of the charging system
mechanism.
Figure 27. Charging Adjustment.
Eccentric
#10-32
Recessed
Vertical Edge
Hex Socket
Set Screw
with Locking
Nut 66
29