Installation Checks And Initial Functional Tests; Introduction; Inspections. Checks Andtests Without Control Power; Spring Discharge Check (Figure 1) - Siemens 3AH Series Instructions Manual

Installation Checks and Initial FunctionaiTests

Introduction

This section provides a description of the inspections,
checks and tests to be performed on the circuit breaker
module only.
Inspections, Checks and Tests without Control Power
Vacuum circuit breakers are normally sh ipped with their
primary contacts open and their springs d ischa rged. How­
ever, it is critical to first verify the discharged condition of
the spring-loaded mechanisms after de-energizing control
power.
Spring Discharge Check (Figure 1 )
Perform the Spring Discharge Check before removing
the circuit breaker from the pal let or removing it from the
switchgear.
The spring discharge check consists of simply performing
the following tasks in the order g iven. This check assures
that both the opening and closing springs are fully dis­
charged.
Hazardous voltages and high-speed
moving parts.
Will cause death, severe personal injury, or
property damage.
Read instruction manuals, observe safety
instructions and use qua lified personnel.
1. Press red Open push button.
2. Press black Close push button.
3. Again press red Open pushbutton.
4. Verify Spring Condition Indicator shows DISCHARGED.
5. Verify Main Contact Status Indicator shows OPEN.

Manual Spring Charging Check

1. Insert the manual spring charging crank into the manual
charge handle socket as shown in Figure 1. Tu rn the
crank clockwise until the spring condition indicator
shows th e closing spring is Charged.
2. Repeat the Spring Discharge Check.
3. Verify that the springs are discharged and the circu itbreak-
er primary contacts are open by indicator positions.
As-Found and Vacuum Check Tests - Perform and record the
resu lts of both the As-Found insulation test and the vacuu m
check hig h-potential test. Procedures for these tests a re
described in the M aintenance Section of this manual.

Automatic Spring Charging Check

N ote: A temporary source of control
power and test leads may be required if the control power
source has not been
A DANGER
Figure 1. Front Panel Controls of Circuit Breaker and
Manual Charging of Closing Spring
connected to the switchgear. Refer to the specific wiring
information and rating label for your circuit breaker to de­
termine the voltage requ i red and where the control voltage
signal should be applied. When control power is connected
to the circuit breaker, the closing spring should automati­
cally charge.
The automatic spring charging features of the circuit breaker
must be checked. Control power is required for automatic
spring charging to take place.
1. Open control power circuit by opening the control power
disconnect device.
2. Energize (close) the control power circuit d isconnect.
3. Use the Close and Open controls (Figure 1) to first Close
and then Open the circuit breaker contacts. Verify
contact positions visually by observing the Open/Closed
indicator on the circuit breaker.
4. De-energ ize control power by repeating Step 1. Discon­
nect the plug j u m per from the switchgear first and next
from the circuit breaker.
5. Perform th e Spring Discharge Check again. Verify that
the closing spring is discharged and the primary con­
tacts of the circuit breaker a re open.

Final Mechanical Inspections without Control Power

1 . Make a final mechanical inspection of the circuit brea ker.
Verify that the contacts a re in the open position, and the
closing spring is d ischarged.
2. Verify mechanical condition of springs.
3. Check for loose hardware.
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