Module withdrawal and insertion may only be performed when control power has been removed from the
unit. Inserting an incorrect module type into a slot may result in personal injury, damage to the unit or con-
nected equipment, or undesired operation!
Proper electrostatic discharge protection (i.e. a static strap) must be used when coming in contact with
modules while the relay is energized!
The relay, being modular in design, allows for the withdrawal and insertion of modules. Modules must only be replaced with
like modules in their original factory configured slots.
The faceplate can be opened to the left, once the sliding latch on the right side has been pushed up, as shown in the figure
below. This allows for easy accessibility of the modules for withdrawal.
WITHDRAWAL: The ejector/inserter clips, located at the top and bottom of each module, must be pulled simultaneously to
release the module for removal. Before performing this action, control power must be removed from the relay. Record
the original location of the module to ensure that the same or replacement module is inserted into the correct slot.
INSERTION: Ensure that the correct module type is inserted into the correct slot position. The ejector/inserter clips
located at the top and at the bottom of each module must be in the disengaged position as the module is smoothly inserted
into the slot. Once the clips have cleared the raised edge of the chassis, engage the clips simultaneously. When the clips
have locked into position, the module will be fully inserted.
Type 9C and 9D CPU modules are equipped with 10BaseT and 10BaseF Ethernet connectors for communications.
These connectors must be individually disconnected from the module before the it can be removed from the chas-
Figure 3–5: UR MODULE WITHDRAWAL/INSERTION
L90 Line Differential Relay
3.1.2 MODULE WITHDRAWAL / INSERTION
GE Power Management