Current Limitations; Operation With Motor Loads; Service & Maintenance; Field Replacement Of Capacitors - Emerson Sola HD 23-13-030-2 User Manual

6.8 Current Limitations

When the load is increased beyond the MCR's rated value, a point is reached where the output voltage suddenly collapses and
will not regain its normal value until the load is partially released. Under short-circuit conditions, the load current is limited to
approximately twice of the rated full-load value, and the input power to less than 10% of normal. The unit will protect both itself
and its load against damage from excessive fault currents. Fusing of load circuits is not necessary.

6.9 operation with Motor Loads

Because of the current-limiting effect described above, special attention should be given to motor applications. In general, the
regulator must have a load rating nearly equal to the maximum power drawn during the starting cycle. This may run from two to
eight times the normal (running) rating of the motor. In doubtful cases, it is advisable to measure the actual starting current.
7.1 Service & Maintenance
The unit is a simple, rugged device with no moving parts. Routine service and/or maintenance is not required. If a problem does
occur, please refer to "8.0 Troubleshooting" or contact SolaHD Technical Support for assistance.

7.2 Field replacement of Capacitors

Capacitors used in our units are the highest commercial grade, with each one given a rigid acceptance test upon receipt. SolaHD
guarantees free replacement of any capacitors which fail within one year of sale. Older units can be replaced at a moderate
charge.
NOTE: It may be possible to test and identify defective capacitors in the field. Please contact SolaHD Technical Support at
1.800.377.4384 or 1.847.268.6651 for further assistance.
Table 14: Troubleshooting
Problem
Nominal voltage too high
Nominal voltage too low
Unit does not regulate closely
Output voltage is very low (20–60 V)
No output voltage
Transformer operating temperature
Unit is operating, but does not appear to
have the correct output
Support
Please contact SolaHD Technical Support at 1.800.377.4384/1.847.268.6651 or by e-mail at solahd.technicalservices@emerson.com for further
assistance.
7.0 Service & Maintenance

8.0 Troubleshooting

1. The load may be considerably less than the full rating. See "6.2 Load Regulation".
2. The load may have a leading power factor.
1. The load power factor may be lagging.
2. The unit may be slightly overloaded. See "6.8 Current Limitations".
1. The unit may be slightly overloaded. See "6.8 Current Limitations".
2. The actual line voltage swings may be outside the rate range of the unit, particularly on the low
side.
3. On varying loads, a certain amount of load regulation may be mixed with the line voltage regu-
lating action. See "6.2 Load Regulation".
1. Unsuspected or unplanned overloads of substantial size may occur intermittently (motor-
starting currents, solenoid inrush currents, etc.). See "6.8 Current Limitations".
2. One or more capacitors in the regulator may be defective.
1. Check power source breakers or fuses.
2. Check input switch.
3. Check continuity between input terminals, and also between output terminals.
1. The transformer used in the unit is designed to operate at high flux density and relatively high
temperatures. After connection to the line for 30 minutes or so, the transformer core structure
may be too hot to touch with your bare hands. This is normal and should not cause concern.
The steps below will usually establish whether the apparent poor performance is due to a fault in
the unit or to some peculiarity of the working load.
1. Disconnect the working load.
2. Connect a dummy load of lamps, heaters, or other resistive loads (substantially equal to the
full load rating of the regulator) directly across the output terminals.
3. Measure the output voltage of the regulator (using a true RMS type voltmeter) directly across
the output terminals.
Action
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