Deif Multi-line 2 General Guidelines For Commissioning

Multi-line 2 General Guidelines for Commissioning
DEIF A/S Page 11 of 19
- Make sure that the generator cannot start.
- Turn the PPU/GPC/AGC OFF and ON again (to make sure that the PWM output is reset).
- Start the generator (no load).
- Adjust setting 2272/2662 until the correct speed (and frequency) is achieved.
Speed droop
The speed governor must have a speed droop of 3-4% (speed dropping 3-4% from no load to
full load, when the multi-line 2 is not in control). In order to ensure equal load sharing on parallel
running machines, all governors must have the same droop setting.
Speed range
When using the analogue interfacing, the resistor installed across the output terminals is
selected to obtain the necessary speed range. When finding the correct resistor, several aspects
must be considered.
The necessary speed range must be selected to make operation at full load possible. Typically,
this is f
NOM
+ 3Hz. If the speed range is too high, then the resistor size must be decreased. If the
speed range is too low, then the resistor size must be increased.
Terminals
The governor can either be prepared for analogue interfacing or digital interfacing. When
analogue interfacing is used, a +/- 20mA signal from the multi-line 2 is applied. This signal can
be converted to the necessary voltage level. When digital interfacing is used, two relays are
used as increase/decrease outputs.
The terminals must be identified depending on the necessary interfacing. Some general
examples are shown in the illustrations below.
Digital interfacing
Motor potmeter
DEIF recommends adjusting the speed droop on the speed governor for stability
purposes. It is necessary in all cases when relay outputs for governor control is
used.
When analogue interfacing is used, it is possible to operate with a speed droop
adjustment of 0%, but for stability and safety purposes it is recommended to use
the speed droop adjustment.
The speed range must allow for the full load of the gen-set. If full load cannot be
reached, then the resistor size must be increased.

Deif Multi-line 2 Specifications

General

Brand	Deif
Model	Multi-line 2
Category	Controller
Language	English