SMA SUNNY CENTRAL Maintenance manual - Manual (Page 44)

Maintaining the inside of the switch cabinet SMA Solar Technology AG
44 SCWAR-WEN094020 Maintenance Manual
Procedure for checking the heating
1. Switch the Sunny Central to "Stop" and open the doors.
2. Ensure that the Sunny Central is connected to a control voltage (supply voltage).
3. Tape door contact switch to the "On" position.
4. Turn the hygrostat down as far down as possible.
☑ If the value is smaller than the current air humidity, the heater is activated.
☑ If the hygrostat has been switched through, the heating fans must start and the air blown
through the heat sink must heat up.
5. Once the functional test of the heating has been conducted, adjust the hygrostat back to the
initial setting. The value is specified with an adhesive label on the thumb wheel and in the circuit
diagram.
6. Release door contact switches (remove the adhesive tape).
7. Close the cabinet doors.
View of hygrostat
DANGER!
Death resulting from electric shock and burning upon touching the medium-
voltage grid's live components.
• Do not touch parts other than those described in the instructions.
Air humidity is too low
If the air humidity is too low, a functional test of the heater can not be carried out. In this
case, the hygrostat does not switch on, even if it is set to the minimum value.
CAUTION!
Danger of burn injury due to hot heating parts.
• Do not touch parts other than those described in the instructions.