SICK GMS815P-PS-2G, Дополнительные инструкции по эксплуатации

Страница: 25 / 40

Installation
GMS815P-PS-2G/-3G · Supplementary Operating Instructions · 8016234 V2.0 · © SICK AG 25
Su
bj
ec
t t
o c
han
ge
w
ith
ou
t n
ot
ic
e
3.9.3
Installation information for intrinsically safe signal connections
Cable installation
▸
Connect each signal cable for intrinsically safe signal connections to one built-in addi-
tional module (
→ p. 24, Fig. 5 ).
▸
Install the signal cables in compliance with EN 60079-11 (“Explosive Atmospheres -
Part 11: Equipment protection by intrinsic safety “i””).
▸
Maintain electronic limit values ( → p. 25, §3.9.4 ).
▸
Install all components of a signal circuit intrinsically safe.
3.9.4
Electronic alarm settings for intrinsically safe signal connections
Intrinsic safety of the connected intrinsically safe signal circuit is only ensured when the
power circuit, including cables, maintains the limit values specified below.
Limit values for intrinsically safe analog outputs
Limit values for intrinsically safe digital inputs and digital outputs
WARNING: Risk of explosions
Intrinsically safe installations must maintain a certain clearance from other
electrical equipment (specifications see EN 60079-11).
▸
Lay intrinsically safe signal cables so that the required safety distance to
equipment not intrinsically safe is ensured everywhere.
CAUTION: Lower limit values could possibly be applicable
Lower limit values could be applicable for the individual application case. The
composition of the explosive atmosphere is decisive here.
▸
Determine the highest allowable limit values for the individual application
case using the European standard EN 60079-0 “Explosive atmospheres.
Equipment. General requirements”.
▸
If this results in limitations: Note these limitations (e.g. in this document)
and consider during installation.
The Zener barriers used for analog outputs each have 2 channels. One chan-
nel is normally used for each analog output. In this case, the analog outputs of
a single Zener barrier have a common negative pole (integrated in the Zener
barrier) which means they are not separated potential-free from each other.
Parameters of the intrinsically safe power circuit Allowable value
Channel 1/Channel 2 Combined
Total inductivity L
A
≤ 1.5 mH ≤ 0.37 mH
Total capacity C
A
≤ 580 nF ≤ 580 nF
L
A
/R
A
≤ 61 μ H/ Ω ≤ 30 μ H/ Ω
Parameters of the intrinsically safe power circuit Allowable value
Total inductivity L
A
≤ 4.1 mH
Total capacity C
A
≤ 83 nF
L
A
/R
A
≤ 54 μ H/ Ω