Mechanical And Electrical Function Test - Siemens 8DJH Installation And Operating Instructions Manual
Medium-voltage switchgear
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Also See for 8DJH:
- Installation and operating instructions manual (174 pages) ,
- Operator's manual (2 pages) ,
- Installation and operating instructions manual (129 pages)
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Undervoltage release
(optional)
500-8067.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DJH • Revision 05
15.2
Mechanical and electrical function test
DANGER
Putting defective switchgear into operation can endanger the life of people and damage the
switchgear.
➭ Never put switchgear into operation if during test operation a part of it does not work as
described here. Please contact the regional Siemens representative.
➭ Perform test operations without high voltage!
ATTENTION
The circuit-breaker can be damaged by no-load switching. After charging the spring energy
store, do not open the circuit-breaker directly.
➭ After charging the spring energy store, close the circuit-breaker first, and then open it.
The operating mechanism of the circuit-breaker type 2 can optionally be equipped with an
undervoltage release. The undervoltage release is located in the operating mechanism
compartment behind the front cover.
A retaining bolt is screwed into the undervoltage release. The function of the undervoltage
release can be blocked by changing the position of the retaining bolt.
• On circuit-breakers type 2, the undervoltage release is delivered by the factory in position A
"Trip blocked".
Fig. 54:
Undervoltage release
Changing the setting of the undervoltage release:
DANGER
Risk of injury by release of charged operating springs when the front cover of the operating
mechanism is removed! Bruises or cuts at the hands can be the consequence.
➭ To avoid impermissible switching operations, switch off auxiliary voltage, e.g.:
- Switch the auxiliary voltage supply of the motor.
- Trip the MCB.
- Disconnect the control cables from the low-voltage compartment.
➭ To discharge the spring energy store in the operating mechanism, perform the following
operations before removing the front cover:
- Actuate the OFF pushbutton.
- Actuate the ON pushbutton.
- Actuate the OFF pushbutton.
➭ The spring energy store indicator must show "spring not charged".
➭ Remove the front plate.
➭ Insert the retaining bolt of the striker at the undervoltage release in the desired position.
✔ Mount the front plate.
Installation
①
Retaining bolt of the striker
Position A:
Trip blocked
Position B:
Trip free
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