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eSure™ MPPT Solar Converter Module User Manual (UM1S482000E3)
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Rev. J
16
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Output Protection:
a)
Overload / Reverse Current: The solar converter has a 63 A fuse in the negative output DC bus.
This fuse is not customer replaceable. The solar converter can be plugged into or pulled out of a
shelf while operating, without damage or opening the fuse.
b)
Current Limiting: The solar converter has a current limit function. The current limit point can be set
between the range of 0 A to 41.7 A, adjustable via the controller. The current limit accuracy is ±1.5 A
when the output voltage ranges from 42 V to 58 V.
c)
Advanced Current Limit Function: The solar converter has an advanced Current Limit Function.
When a short circuit occurs at the solar converter output terminals, the solar converter will keep its
output current at a constant value (value that is configurable via the controller). This function
effectively protects the solar converter and the equipment connected to the solar converter. When
the short circuit fault is cleared, the solar converter will automatically restore back to normal
operation.
d)
High Voltage Shutdown:
1.
Adjustable Control: If solar converter output voltage exceeds an adjustable preset value and
the solar converter is delivering more than 10% of its rated current, the solar converter shuts
down. (Adjustable from 56 VDC to 59 VDC via the controller. The restart hysteresis is 0.5 V
±0.2 V.)
The solar converter then restarts and a HVSD restart timer starts (time value configurable via
the controller, factory default is 5 minutes). If output voltage again exceeds the high voltage
shutdown value before the HVSD restart timer expires, the solar converter shuts down and
locks out. Manual restart is then required (by turning power to the solar converter off or by
removing the solar converter, waiting until the LEDs on the solar converter extinguish, then
turning power to the solar converter on or re-inserting the solar converter). If the solar
converter does not experience a high voltage condition before the HVSD restart timer expires,
the restart circuit is reset.
If two or more solar converters are paralleled, only the solar converter causing the high voltage
condition shuts down.
2.
Backup: If solar converter output voltage exceeds 59.5 V ±0.5 V (non-adjustable) and the solar
converter is delivering more than 10% of its rated current, the solar converter shuts down. The
solar converter then restarts and a HVSD restart timer starts (time value configurable via the
controller, factory default is 5 minutes). If output voltage again exceeds the high voltage
shutdown value before the HVSD restart timer expires, the solar converter shuts down and
locks out. Manual restart is then required (by turning power to the solar converter off or by
removing the solar converter, waiting until the LEDs on the solar converter extinguish, then
turning power to the solar converter on or re-inserting the solar converter).
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Over-Temperature Protection: The solar converter provides over temperature protection by derating
output power and recovers automatically.
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Active Load Sharing: The solar converter uses advanced digital active load sharing technology that
maintains balancing to within 3% of rated current. The active load sharing is accomplished via a shared
communication buss. The total system current is divided by the quantity of power modules installed in
the system to determine the per module average load that each module should deliver. Each module