CHAPTER 3: INSTALLATION
Figure 3-2: Horizontal mounting (enhanced panel)
Figure 3-3: Horizontal mounting and dimensions (standard panel)
3.2.2 Vertical units
The L90 is available as a reduced size (¾) vertical mount unit, with a removable faceplate. The faceplate can be specified
as either standard or enhanced at the time of ordering. The enhanced faceplate contains additional user-programmable
pushbuttons and LED indicators.
The modular design allows the relay to be upgraded and repaired by qualified service personnel. The faceplate is hinged to
allow easy access to the removable modules, and is itself removable to allow mounting on doors with limited rear depth.
The case dimensions are shown in the following figure, along with panel cutout details for panel mounting. When planning
the location of your panel cutout, ensure that provision is made for the faceplate to swing open without interference to or
from adjacent equipment.
The relay must be mounted such that the faceplate sits semi-flush with the panel or switchgear door, allowing the operator
access to the keypad and the RS232 communications port. The relay is secured to the panel with the use of four screws
supplied with the relay.
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL