Eurotherm 590L Series, Product Manual, Page: 58 / 170

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The tacho calibration volts are set using the 2 in-line switches (10-way). The switches set Volts
in units and tens. The hundreds are set by the 1-way switch. The illustration above shows a
setting of 90V.
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For full speed tacho voltages greater than 200V, an external resistor, value RE, is required in
series with the tachogenerator connection to terminal G3.
Set the switches on the Tacho Calibration Option Board to give a value of 200V, as shown
opposite.
RE then is given by the formula:
RE
(tachovolts 200)
5
k
=
−
Ω
The power dissipation of this resistor is given by the formula
W = (tacho volts - 200) x 5 milliwatts
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The option board assumes a 1000 lines per rev encoder is being used. Speed is set directly by the
ENCODER RPM parameter. If you are using an alternative lines per rev encoder, you must set
the ENCODER LINES parameter on the MMI later in the Operating Instructions.
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Connect the auxiliary power supply to power terminals D7 and D8 (but do not connect the main
3-phase power supply at this stage). Check that the correct voltage appears between terminals D7
and D8.
The MMI will now display the Welcome screen, and the Health and Overcurrent Trip MMI
LEDs will be illuminated (assuming that the Converter’s control terminals are wired as shown in
Figure 3-4, Minimum Connection Requirements).
Use a digital voltmeter to check for the following:
+24V rail at terminal A9
Using the MMI, select the correct speed feedback option. The default is
ARM VOLTS FBK. (Note that this is the last selection in the list, use
the
↑↑↑↑
(UP) key to reveal other selections).
The selections are ARM VOLTS FBK, ANALOG TACH, ENCODER
and ENCODER/ANALOG.
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1
10
0
100
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4
SETUP PARAMETERS
5
SPEED LOOP
SPEED FBK SELECT