Carbolite GPC Series - Manual (Page 4)

GPC
4
MF04 3.29
2.5 Electrical Connections
Connection by a qualified electrician is recommended.
All GPC models have three internal circuits and are normally supplied for three phase supply. This
may be either star or delta, but a furnace must only be connected to the type and voltage of supply
for which it was made (but see 2.6).
If the furnace is ordered for a single phase supply, this may be
Live to Neutral reversible or non-reversible, or Live to Live.
Access to electrical connections is by removal of the back panel (laboratory models), or removal of
the lower back panel (industrial models). The industrial models are fitted with an internal isolator;
cabling should be taken through the mesh base panel directly to the isolator or the nearby
terminals: live connections to the isolator; neutral (if present) and earth to the nearby terminals.
Check the furnace rating label before connection. The supply voltage should agree with the voltage
on the label, and the supply capacity should be sufficient for the amperage on the label.
The supply should be fused at the next size equal to or higher than the amperage on the label. A
table of the most common fuse ratings is also given in section 8.1 of this manual. Where a supply
cable is present there are internal supply fuses; customer fusing is preferred but not essential.
Furnace with supply cable: either wire directly to an external isolator or fit with a line plug.
Furnace without supply cable: a permanent connection to a fused and isolated supply should be
made to after temporary removal of the furnace back panel.
Connection by line plug: the plug should be within reach of the operator, and should be quickly
removable.
Connection to external isolating switch: this should operate on both conductors (single phase) or
on all live conductors (three phase), and should be within reach of the operator.
The supply MUST incorporate an earth (ground).
CONNECTION DETAILS supply type
Supply Terminal label Cable colour Live-Neutral Reversible or Live-Live
1-phase L Brown To live to either power conductor
N Blue To neutral to the other power conductor
PE Green/Yellow To earth (ground) to earth (ground)
supply Terminal label Cable colour
3-phase L1 Black to phase 1
L2 Black to phase 2
L3 Black to phase 3
N Light Blue to neutral except delta
PE Green/Yellow to earth (ground)
2.6 “Universal Wiring”
From Year 2000 GPC 12/36 and GPC 13/36 models can be easily rewired between 1-phase and
3-phase supplies. This applies to 3-phase+N and 3-phase delta in the ranges 380/220V–415/240V
and 208-240V, but does not apply to 3-phase star without neutral (e.g 380V).
To alter the configuration, remove the back panel and alter the wiring connections between the
supply terminal block and the EMC filters, using the appropriate diagram from section 7.6.
2.7 Voltage and Power Limit
When first starting up the furnace check the setting of the OP.Hi parameter (see controller manual)
and compare it with the data in section 8.2. If the power limit setting is incorrect for the voltage of
your supply, change it. This must be done immediately if the setting of
OP.Hi is higher than it
should be.