Term Abbreviation Explanation
Digital input DI
Terminals on a controller hardware module that the controller uses to measure a
digital input. A pre-configured digital input function or alarm can be assigned to the
input.
Digital output DO
Terminals on a controller hardware module that the controller uses to send a digital
output. A pre-configured digital output function can be assigned to the output.
Direct current DC
EMERGENCY
genset controller
Controls and protects the emergency genset (normally a diesel generator). This
includes control of the generator breaker and the tie breaker. If the system loses
power, the controller ensures that the emergency genset supplies power to the
emergency busbar.
Engine interface
module 3.1
EIM3.1
A replaceable PCB, with its own power supply. This module includes 4 relay
outputs, 4 digital inputs, an MPU and W input, and 3 analogue inputs. Used in some
of the DEIF controller types.
Generator breaker GB
The breaker between a generator (for example, a genset) and the busbar. The
GENSET and EMERGENCY genset controllers can control a generator breaker.
GENSET controller
Controls and protects a genset (normally a diesel generator). This includes control
of the generator breaker. The Power Management System can automatically start
and stop gensets to ensure that the required power is available.
Governor GOV Regulates the engine speed.
Governor and AVR
module 3.1
GAM3.1
A replaceable PCB, which includes load sharing capability. This module also
includes 4 relay outputs, 2 analogue current or voltage outputs, a pulse width
modulation output, and 2 analogue current or voltage inputs. Used in some of the
DEIF controller types.
Heavy consumer HC
When a request is made, the power management system reserves and manages
the power required by the heavy consumer(s).
Inhibit
A pre-defined condition that inhibits the alarm action. For example, for the inhibit
Not running, if the genset is Not running, the under-frequency alarm is prevented
from occurring. Inhibited alarms are not shown in the alarm display.
Input output module
3.1
IOM3.1
A replaceable PCB, with four relay outputs, and 10 digital inputs. Used in the DEIF
controller.
Latch
An extra layer of protection that keeps the alarm action activated. When the alarm
is not active and acknowledged, it can be unlatched.
Light emitting diode LED Used to show the controller and equipment status and alarms.
Liquid crystal display LCD
The screen of the display unit. The information displayed varies, depending on the
controller mode, the equipment operation and the operator input.
Load sharing
The controllers adjust the gensets so that that each genset supplies the right
amount of the total power. For symmetrical load sharing, each genset supplies the
same proportion of its nominal power.
Magnetic pickup MPU
Measures the genset speed (that is, RPM). This sensor is normally located at the
genset flywheel.
Module
A standardised, replaceable printed circuit board that is mounted in the rack. For
example, PSM3.1 is a hardware module that supplies power to the rest of the rack.
Neutral N The neutral line in a three-phase electrical system.
Nominal setting nom or NOM
Defines the expected voltage and frequency for the system, along with each power
source's maximum load and current. The controller's protections are based on
percentages of the nominal settings.
Non-essential load NEL
A load that is not critical to the system. These may be disconnected by the
controller in the event of over-load, over-current, or busbar under-current.
PPM 300 Operator's manual 4189340910 UK
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