Specifications

Document No. DER03022 INSTALLATION INSTRUCTIONS
Page 8 of 15 Effective Date 23 Dec 08
PLC CONNECTOR INSPECTION
General
Occasionally, vibration during transport may cause connections to the PLC to become
disengaged. The unsatisfactory wiring condition that results may cause a centrifuge malfunction.
Before applying power to the centrifuge, confirm that all PLC connectors are securely mated as
described in the procedure below. In addition, rotational direction of motors should be checked
before the initial startup.
Connector Checkout
This procedure should be used upon delivery of equipment to the site and before connecting and
applying power to the equipment. Its purpose is to ensure that all PLC connectors are fully
engaged.
This procedure should also be used as an initial troubleshooting step in case of centrifuge control
system malfunction. Always check for an improper connection before concluding that the
equipment malfunction is due to a defective PLC or other component.
To perform the PLC inspection, proceed as follows:
WARNING! TO AVOID SERIOUS PERSONAL INJURY BE SURE EQUIPMENT
IS LOCKED OUT, TAGGED OUT, DE-ENERGIZED BEFORE OPENING THE
CONTROL CABINET TO PERFORM THIS PROCEDURE.
1. With electric power shut down, disconnected, and locked out and tagged out, open cabinet
door.
2. Check position of connector insertion tabs on each section of the PLC as shown in the photos
below. To ensure that the connectors are fully engaged, both tabs should be inserted fully into
their respective slots (Figure 3022-7).
3. If the inspection reveals that either tab has moved, slide the tab(s) fully into the slot(s).
4. After completing the inspection and corrective action, if necessary, close and secure the
control cabinet door.
5. Proceed with the Initial Startup procedure.