Eurotherm 590+ Series, Product Manual, Page: 88 / 308

4-12
Operating the Converter
590+ Series DC Digital Converter
WARNING!
Only continue with the set-up instructions if this test is completed satisfactorily.
13
If the drive has run satisfactorily without any need for reconnection of the field or
tachogenerator but the direction of rotation is wrong, open the main contactor and disconnect
all supplies.
13.1 Analog Tachogenerator:
Reverse both field and tachogenerator connections.
13.2 MICROTACH/Encoder:
Reverse the field, re-establish the auxiliary supply and
reverse the ENCODER SIGN parameter.
IMPORTANT: When satisfactory operation has been achieved, perform a PARAMETER SAVE. Refer to
Chapter 5: “The Operator Station” - Saving Your Application.
14
With the MAIN CURR.LIMIT parameter set to 20% or the level required to achieve
rotation, set the Speed Setpoints so that the value of the SPEED SETPOINT is about 10%, 1.0V
at setpoint input (Terminal A8). The motor will accelerate to this speed setting.
14.1 4 Quadrant Drives which require reverse rotation:
Alter the Speed Setpoints so that the value of the SPEED
SETPOINT parameter is about -10% and check that motor
runs in the reverse direction.
14.2 Adjustment of ZERO SPEED OFFSET parameter:
(Ensure STANDSTILL is DISABLED as in item 11)
„ 4 Quadrant, non-reversing drives
Set the Speed Setpoint potentiometer to zero and
adjust the ZERO SPEED OFFSET parameter for
minimum shaft rotation.
„ 2 Quadrant, non-reversing drives
Set the Speed Setpoint potentiometer to zero and adjust the ZERO SPEED
OFFSET parameter until the shaft is just rotating then reduce level until the
shaft stops.
„ 4 Quadrant, reversing drives
Set the ZERO SPEED OFFSET parameter to balance
maximum speed in
forward and reverse directions.
You can also set the STANDSTILL LOGIC parameter to
ENABLE if a stationary shaft is required.
15
Gradually increase the Speed Setpoints so that the value of the SPEED SETPOINT
(DIAGNOSTIC menu) is at maximum. Check the shaft speed is
correct.
If fine adjustment is required adjust the calibration as appropriate to
the speed feedback selection:
• Armature Voltage feedback has a +2/-10% trim, greater changes
outside this range require re-setting of the calibration switches.
•
Analog Tachogenerator has a + 2 /- 10% trim, greater changes outside this range require re-
setting of the calibration switches.
•
The MICROTACH/Encoder should give an absolute rotational speed for which adjustment is
unnecessary however the motor speed may not be the relevant factor thus speed of rotation
can be altered by simply adjusting the calibration.
MMI Menu Map
1
CONFIGURE DRIVE
ENCODER SIGN
MMI Menu Map
1
DIAGNOSTICS
SPEED SETPOINT
MMI Menu Map
1
SETUP PARAMETERS
2
CALIBRATION
ZERO SPD.OFFSET
MMI Menu Map
1
SETUP PARAMETERS
2
STANDSTILL
STANDSTILL LOGIC
MMI Menu Map
1
SETUP PARAMETERS
2
CALIBRATION
ARMATURE V CAL.
ANALOG TACH CAL.
ENCODER RPM