Vaisala MGP261, Инструкция по установке и безопасности

Страница: 11 / 208

Wiring Requirements
• The wiring of the optional intrinsically safe (Ex ia) external pressure or temperature sensor
input terminal must be kept separate from the analog input, power supply input, and
RS-485 wiring.
• See the installation overview and installation instructions for more information.
• The cable glands and wires used for wiring MGP261 must be Ex compliant.
• Unused lead-throughs must be sealed using Ex compliant plugs.
• Select a strain relief option that suits the application (either use cable glands that include
strain relief or install separate clamps: see IEC 60079-14).
• See Table 1 (page 7) for screw terminal requirements.
• Permitted supply short-circuit current (I
k
): 50 A
• MGP261 analog outputs must be externally powered.
Connect only de-energized wires. Never switch on the power supply
input before completing the wiring and closing the connection box.
CAUTION!
Screw Terminal Connections
Table 1 Screw Terminal Wiring Requirements
Property Specification
Connection torque 0.5 Nm ... 0.6 Nm
Connection capacity (solid and flexible)
0.2 mm
2
... 2.5 mm
2
(AWG 24 ... 12)
Stripping length 7 mm (0.27 in)
Intrinsic Safety
The overvoltage category of MGP261 is I (non-mains equipment), as defined in IEC 60664-1.
MGP261 is in conformance with the IEC 60079-11 dielectric strength requirement. For the
intrinsic safe IIB output parameters, see Table 2 (page 7) .
Table 2 Intrinsic Safe IIB Output Parameters
Parameter Value
U
o
25.2 V
I
o
78 mA
P
o
0.5 W
U
m
40 V
C
o
820 nF
L
o
20 mH
The parameters listed in Table 2 (page 7) apply when one of the two conditions below is given:
• the total L
i
of the external circuit (excluding the cable) is < 1% of the L
o
value; or
7
ENGLISH