Eurotherm 590+ Series, Product Manual, Page: 39 / 308

Installing the Converter
3-13
590+ Series DC Digital Converter
Control Wiring Connections (Frames 1, 2, 3, 4 & 5)
Note:
Refer to Chapter 11: “Technical Specifications” for Control Terminal information.
•
Use screened control cables to comply with EMC requirements.
•
Control wiring must have a minimum cross-section area of 0.75mm
2
(18AWG).
•
Feed the control cables into the Converter and connect to the control terminals. Refer to the
connection label on the inside of the terminal cover. Close the terminal cover.
IMPORTANT: All connections made to terminal blocks A, B and C must be isolated signal voltages.
If in doubt about the connection of the DC motor to the controller check with Eurotherm
Drives.
Setpoint Ramp Input (A4, A6, B3, B4 & Current Limit)
For normal operation the speed demand signal is connected to the
"Setpoint Ramp Input", terminal A4 (Analog Input 3). This input is scaled
so that:
+10V input = maximum forward speed demand (+100%)
-10V input = maximum reverse speed demand(-100%)
The speed demand signal can be generated by connecting the two
ends of an external 10K potentiometer to the +10V reference
terminal B3 and -10V reference terminal B4, the wiper of the
potentiometer being connected to the "Setpoint Ramp Input" as the
speed reference.
The main current limit is adjustable by means of the MAIN
CURR. LIMIT parameter [Tag No. 15]:
•
For normal operation of the main current limit, Terminal A6
should be connected to the +10V reference, Terminal B3. The
CURR. LIMIT/SCALER parameter should be set to 200%.
This allows the MAIN CURR. LIMIT parameter to adjust the
current limit between 0 and 200% full load current.
•
If external control of the main current limit is required, a 10K
potentiometer connected between Terminal B3 (+10V Ref) and Terminal B1(0V), with the
wiper connected to Terminal A6 (Analog I/P5) gives 0 to 200% of full load current provided
that the MAIN CURR. LIMIT and CUR. LIMIT/SCALER parameters are set to 200%.
Signal 0V (A1)
This is the common reference point for all analog
signals used in the drive.
For non-reversing applications and 2 quadrant
controller (591+), the speed demand only needs to
operate between 0V and +10V, the anti-clockwise
end of the potentiometer should then be connected
to Terminal A1 (0V).
Speed Setpoint No. 1 (A2)
Terminal A2 (Analog Input 1) is a direct speed
demand by-passing the "Setpoint Ramp Generator",
and should be used if direct control is required.
Speed Setpoint No. 2 / Current Demand (A3)
Terminal A3 (Analog Input 2) is a dual function terminal (either "Speed Setpoint No. 2" or
"Current Demand") as selected by mode switch control "Current Demand Isolate", Terminal C8.
As a speed setpoint, it can be used in the same way as Terminal A2.
Note:
If more than one speed setpoint is used, they are additive.
8
MINIMUM
CONNECTION
REQUIREMENT
SETPOINT
RAMP
10K
B3 A4 B4
A6
INPUT
SIGNAL 0V
SPEED SETPOINT No. 1
CURRENT DEMAND
B9 A1
A3
A2
SPEED SETPOINT No. 2/