4. Pick-up
HELENOS III
5
4. Pick-up IA ...
4.1. Specification
IA 02 - 76 to IA 12 - 102
Temperatur Range
-55 °C to +120 °C
Output Voltage
0,5 to 10 Volt ~ (AC)
Resistance
approx. 52 Ohm
Distance from Pick-up Wheel
0,5 to 0,8 mm
Protection grade
IP 54
4.2. Installation
The installation of the pick-up has to be arranged in such a way as to obtain a frequency as
high as possible. Normally, the
HEINZMANN
governors DG 162 - 02, DG 302 - 02 and
DG 402 - 02 are designed for a maximum frequency of 12000 Hz. Frequency (by Hz) is
calculated according to the formula
f
(Hz) =
n
z
( / min)*
1
60
z
=
number of teeth on the pick-up wheel
Example:
n
=
1.500
z
=
160
f
=
1500 *160
60
= 4.000 Hz
NB:
It should be taken care that the speed can be measured by the pulse pick-up without
any bias. For best results therefore, the speed pick-up should take the engine speed
from the crankshaft. A suitable position for this is, e.g., the starter gear (but not the
injection pump wheel).
The pick-up gear must consist of magnetic material (e.g., steel, cast iron).
