Siemens 21-115532-001 manual Maintenance, General Instructions, Operational Checks

MAINTENANCE

Page 11

GENERAL INSTRUCTIONS OPERATIONAL CHECKS

This manual does not represent an exhaustive survey of maintenance steps necessary to ensure safe operation of the regulator. Particular applications may require further pro- cedures. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, the matter should be referred to the local Siemens sales representative.

WARNING

Failure to properly maintain the regulator can result in serious injury, death, or equipment damage. The instructions contained herein should be carefully reviewed, understood and followed.

To prevent:

The following maintenance procedures should be performed regularly:

1.Operational checks.

2.Periodic inspection.

Basic regulator operation can be checked while the regulator remains in service. The output voltage can be monitored from the control panel display under the <METER> menu on the “Vld” screen.

•Check the calibration by following the steps in the Basic Troubleshooting section of the Accu/Stat control panel instruction manual.

•Run the tapchanger several steps in one direction in the manual mode until the output voltage is outside of the bandwidth. Return the control to automatic mode. After the predetermined time delay, the tapchanger motor will be observed to return the output voltage in-band. Repeat this operation, running the tapchanger in the opposite direction.

•Check the Vari-AmpTMlimit switches by attempting to run the tapchanger beyond the position to which the switches are set. The limit switches should function to open the circuit. Note: If the limit switch is set at the maximum 10% range and fails to function, the tapchanger will stall against a mechanical stop. The motor is designed to stall continuously without damage.

Hazardous voltages. Will cause serious injury, death, or equipment damage.

To prevent:

Always de-energize and ground the equipment before maintenance requiring access to high voltage parts.

WARNING

The use of unauthorized parts in the repair of the equipment, tampering by unqualified personnel, or faulty repair and adjustments can result in dangerous conditions which can cause serious injury, death, or equipment damage.

To prevent:

Follow all safety instructions contained herein, and contact your local Siemens sales representative for replacement parts.

CAUTION

Operation of the regulator at extreme tap positions could produce line voltages outside of operating limits that could result in property damage.

To prevent:

Operate the regulator only to judiciously determined voltage extremes.

WARNING

Regulator may have High Internal Pressure. Can cause serious injury, death, or equipment damage.

To prevent:

Use pressure relief valve to vent regulator before untanking.