Technical Bulletin

Siemens Solid State Starter wiring problem

Safety Issue--Immediate Action Recommended

Date

September 1, 2003

Reference

131

Route to

Modernization Manager/Service Manager

From

MCE Technical Support Department

Equipment

All Controllers with Siemens Solid State Starters Series 72G with Date Codes of J9/0311 and J9/0324.

Description

A jumper from the Siemens factory was installed incorrectly on the Class 72G Elevator Starters. The jumper should have been installed from terminal 1 to terminal 9 (on the starter itself) but was installed from terminal 2 to terminal 10 (on the starter itself).

The wire acts as a jumper providing power to the normally open Ready Contact. When the jumper is connected between terminal 1 and terminal 9, the normally open Ready Contact controls the fault contactor. When the jumper is connected between terminal 2 and terminal 10, the fault contact can be energized whenever there is a 120 VAC power to the starter regardless of the state of the normally open Ready Contact.

For more information see the attached Siemens Product Safety Notice.

Action

Shut off power to the starter before proceeding to correct the wiring error.

De-energize three phase and 120 VAC supplies to starter.

Check the jumper on the appropriate starter to see if it needs to be changed (SEE FIGURE 1).

Move wire from terminal 10 to terminal 9 (on the starter). The wire in terminal 2 does not have to be moved since terminal 1 and terminal 2 are internally connected.

Re-energize the three phase and 120 VAC supplies to the starter. Verify that the fault contact mounted on the right side of the unit pulled in and the starter accepts the motor wiring configuration.

Help

Should you require additional technical assistance:

• Telephone 916/463-9200
• Touch "6" for Technical Support
• Refer to the reference number above