APS 6RL Series, Operation Manual

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6RL SERIES OPERATION MANUAL
SECTION 6: FRONT PANEL OPERATION
Entire Contents Copyright
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2018 by Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.
6RL Series Regenerative DC Load Operation Manual Page 82 of 204
the set values is not used for adjustment, it can be tied to a defined level or
connected to pin VREF (solder bridge or jumper), so it drives 100%.
Note: The analog interface is galvanically isolated from the DC Input. Therefore, do
not connect any ground of the analog interface to the DC- or DC+ output, if
not absolutely necessary!
6.5.3.2 Resolution and sample rates
The analog interface is internally sampled and processed by a microcontroller. This causes a
limited resolution of analog steps. The resolution is the same for set values (VSEL etc.) and
actual values (VMON/CMON) and is 26214 when working with the 10 V range. In the 5 V
range this resolution halves to 13107. Due to tolerances, the truly achievable resolution can
be slightly lower.
There is furthermore a maximum sample rate of 500 Hz. This means, the unit can acquire
analog set values and states on digital input pins 500 times per second or every two msec.
6.5.3.3 Acknowledging unit alarms
Unit alarms are always indicated in the front display and some of them are reported as
signal on the analog interface socket. For example, the overvoltage alarm (OVP), which is
considered critical.
In case of a unit alarm occurring during remote control via analog interface, the DC Input
will be switched off, the same way as in manual control. While alarms OT and OVP can be
monitored via the corresponding pins of the interface, other alarms like power fail (PF)
cannot. These can only be monitored and detected via the actual values of voltage and
current being all zero contrary to the set values.
Some unit alarms (OVP, OC and OPP) have to be acknowledged, either by the user of the
unit or by the controlling PC. See section 6.6.2, “Unit Alarm and Event Handling” on page 87.
Acknowledgement is done with pin REM-SB switching the DC Input off and on again. This
requires a HIGH-LOW-HIGH edge sequence (min. 50ms for LOW), when using the default
level setting for this pin.
6.5.3.4 Analog Interface Specifications
Pin Name Type* Description Default levels Electrical specifications
1 VSEL AI Set voltage value
0…10 V or. 0...5 V correspond to
0..100% of U
Nom
Accuracy 0-5 V range: < 0.4% *****
Accuracy 0-10 V range: < 0.2% *****
Input impedance Ri >40 k...100 k
2 CSEL AI Set current value
0…10 V or. 0...5 V correspond to
0..100% of I
Nom
3 VREF AO Reference voltage 10 V or 5 V Tolerance < 0.2% at Imax = +5 mA
Short-circuit-proof against AGND
4 DGND POT Ground for all digital
signals For control and status signals.