JUMO 404720, Руководство по эксплуатации

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18
6 Installation
6 Installation
6.1 Electrical connection
DANGER!
The relevant regulations must be observed for an electrical connection:
- Decree on electrical systems in potentially explosive areas (Elex V)
- Regulations for the installation of electrical systems in potentially explosive areas
- EC type examination certificate
 The electrical connection may only be performed by qualified personnel!
The voltage supply must be intrinsically safe and must not exceed the following maximum values:
U
i
: DC 28 V
I
i
: 100 mA
P
i
: 750 mW
effective internal inductance L: negligibly small
effective internal capacitance C: ≤ 10.4 nF
Only intrinsically safe, certified measuring devices may be used in intrinsically safe electrical circuits!
The following values arise for the electrical connection 11 (attached cable) depend on the cable length l :
General information
• Maximum cable length 50 m
• Minimum bending radius 120 mm (for permanent laying)
• Pressure equalization hose included in the cable and in the cable box (straight) accessory part
(chapter 3.4 "Accessories", Page 11); provides automatic compensation of ambient air pressure
fluctuations for relative pressure versions
• Protect the cable end against humidity
• Observe the length-dependent inductances and capacities if lengthening the cable
• Lay the signal lines isolated from cables with a voltage of > 60 V
• Use protected cables with twisted cores
• Keep away from large, electrical plants
NOTE!
The intrinsically safe electrical circuit must be restricted to overvoltage category I as stipulated in
IEC 60664-1. The electrical circuit supply is only to be provided by a certified, intrinsically safe power
source with a protection level of "ib".
NOTE!
In particular, equipment used in potentially explosive areas where hybrid mixtures are present must be
checked. Hybrid mixtures are explosive mixtures of flammable gases, vapors, or mists with flammable
dusts. The operator is responsible for checking that the equipment is suitable for such uses.
U
i
≤ 28 V
I
i
≤ 100 mA
P
i
≤ 750 mW
C
i
≤ 10.4 nF + 107
pF
× l
m
L
i
≤ 1
µH
× l
m