GE 489 - Manual (Page 17)

GE Multilin 489 Generator Management Relay 2-1
2 INSTALLATION 2.1 MECHANICAL
2
2 INSTALLATION 2.1MECHANICAL 2.1.1 DESCRIPTION
The 489 is packaged in the standard GE Multilin SR series arrangement, which consists of a drawout unit and a companion
fixed case. The case provides mechanical protection to the unit, and is used to make permanent connections to all external
equipment. The only electrical components mounted in the case are those required to connect the unit to the external wir-
ing. Connections in the case are fitted with mechanisms required to allow the safe removal of the relay unit from an ener-
gized panel, such as automatic CT shorting. The unit is mechanically held in the case by pins on the locking handle, which
cannot be fully lowered to the locked position until the electrical connections are completely mated. Any 489 can be
installed in any 489 case, except for custom manufactured units that are clearly identified as such on both case and unit,
and are equipped with an index pin keying mechanism to prevent incorrect pairings.
No special ventilation requirements need to be observed during the installation of the unit, but the unit should be wiped
clean with a damp cloth.
Figure 2–1: 489 DIMENSIONS
To prevent unauthorized removal of the drawout unit, a wire lead seal can be installed in the slot provided on the handle as
shown below. With this seal in place, the drawout unit cannot be removed. A passcode or setpoint access jumper can be
used to prevent entry of setpoints but still allow monitoring of actual values. If access to the front panel controls must be
restricted, a separate seal can be installed on the outside of the cover to prevent it from being opened.
Figure 2–2: DRAWOUT UNIT SEAL
Hazard may result if the product is not used for its intended purpose.
WARNING