Honeywell ENCAL 3000 Hardware Manual page 54

The power supply must be reinforced isolated from mains. Voltage range: 24 V DC.
Fluctuations, including mains fluctuations: ± 15%.It must be possible to supply a rating
of up to 120 W. Only one device may be operated on each power supply unit.
The overvoltage/overcurrent and electrical cable protection must be provided by the
power supply unit. Suitable external safety devices must shut down a current of 8.3 A or
over within 120 seconds, thus limiting the power supply.
The device must be connected to the equipotential bonding system at the place of use
and earthed. Use a suitable connection on the base (see Figure 6.7) to connect the
device to the local earth and the equipotential bonding system. If other metal parts are
connected to the device during the installation work, they must be expertly included in
the earthing and the equipotential bonding system. Use the appropriate connections or
install such connections.
The device will only operate correctly if all the system parts have the same earthing
potential. The wire cross-section for earthing is 6 mm² copper wire. The earthing cable
can be connected at various points on the base, depending on the installation
configuration. Generally, the underside is used with M5 threaded bolts, but the rear with
M8 threaded bolts may also be used, see figure 6.7.
When connecting the earthing cable, ensure that it has a good,
permanent, stable electrical contact. When making the contact and
ATTENTION selecting the fastening materials, comply with the appropriate
regulations, for example IEC/EN 60079-14.
Figure 6.7: Example of earthing points on the device
EnCal 3000 Hardware Manual 73022344 o
HARDWARE INSTALLATION
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