1 Positive wire
2 Negative wire
3 Earth wire
4 Wire entry blanking plate - solar
Fig. 28 Solar Cable Connection Details
Reversing the connections to the solar panel will not cause
damage to the RCU electronics in the short term however this
should not be allowed to persist since at high sunlight
conditions for long periods the RCU electronics could be
damaged by the current from the panel in high sunlight
conditions.
Shorting the solar supply terminals to ground will not damage the RCU.
Do not disconnect earth wire.
Do not disconnect earth wire from the terminal block to the
cubicle earth stud. After installation of mains supply ensure
the earth wire is still connected.
5.9 Separate Voltage Transformer Power supply
In some locations a separate voltage transformer (VT) is installed to provide power to the RCU. This
VT should be:
Fused and rated on the high voltage side to match the supply conditions.
The secondary voltage should be AC: 115 V or 230 V as preferred and rated at 150 VA.
A fuse on the secondary adjacent to the VT is recommended to protect from wiring faults of the
pole. The fuse should be rated for the VT and wiring. 2 A recommended.
A method of isolating the RCU from the source supply is required for safe operation.
For most primary voltage ratings Siemens can supply a suitable VT.
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