Selco
C6200 FlexGen
Revision: 03-06-2014
Page 16 of 24
5.7 GOV/AVR Control
Two sets of analogue outputs are provided for the control of speed and voltage. The analogue
outputs are intended for direct control of electronic speed governors and AVRs. Each analogue
output can be configured to provide either a DC voltage within the range of -10 to +10 V DC, a DC
current within the range of 0 to 20 mA or a PWM signal with a default base frequency of 500 Hz.
The analogue outputs are isolated from each other and from the remaining circuitry. This means
that the references of the outputs have no connection to each other or to the common reference
(COM).
Terminal
Signal
Connection
33
reference (isolated)
Governor reference
34
PWM signal
Governor PWM input
35
DC current
Governor current input
36
DC voltage
Governor voltage input
37
reference (isolated)
AVR reference
38
PWM signal
AVR PWM input
39
DC current
AVR current input
40
DC voltage
AVR voltage input
It is important to note that each analogue output is protected against short circuit by an internal 10
k
Ω
resistor. The resistor is located inside the C6200 and placed in series with the output. The output
resistor might affect the magnitude of the output signal if the internal resistance of the external
equipment (e.g. the aux speed input of the governor) is low. The principle of voltage division
applies between the output resistor and the internal resistance of the external equipment. Most
governors and AVRs have high impedeance inputs, so the 10 k
Ω
resistance will typically not be an
issue.
Example: A governor with aux speed input having an internal resistance of only 10 k
Ω
would
reduce a +10 VDC output voltage to +5 VDC. The two 10 k
Ω
resistors in series would make a 1:2
voltage divider.