Siemens ZS-30 User manual

Operation
The SIEMENS System 3 Intrinsically Safe Zone Model
ZS-30, consisting of a Zone Module and a Diode
Shunt Barrier, is designed for use in System 3 low
voltage control anels. With detection devices located
in hazardous areas identified as Class I, II, and III,
Division 1, Grou s A, B, C, D, E, F, and G, the intrinsi-
cally safe characteristic is achieved by using a diode
shunt barrier (P/N 515-180238) with the ZS-30. The
Diode Shunt Barrier, though hysically a se arate unit
of ZS-30, must always be used to achieve an intrinsi-
cally safe zone. The Diode Shunt Barrier limits the
energy to the detector circuit.
The following equi ment is covered by this instruction
sheet.
Item Name and
Model Number Description
NON-HAZARDOUS LOCATION QUIPM NT
Model ZS-30 Zone module (P/N 515-022079)
Model 515-180238 Diode shunt sa ety barrier
(P/N 515-180238)
HAZARDOUS LOCATION QUIPM NT
Detector DI-3IS
Detector S121
Detector S122
Base DB-3 For use with DI-3IS
Cable 465-514391 Limited-energy shielded cable
(Optional)
Check that each device to be located in the intrinsi-
cally safe area has an FM intrinsically safe label. In
addition, direct shorting manual stations and/or
thermal detectors (devices not containing any energy
storing, or voltage roducing, com onents) may be
connected in the detector loo without jeo ardizing the
intrinsically safe characteristics of the system.
NEC Hazardous Location Classification
Class I: Class I locations are those in which flammable
gases or va ors are (or may be) resent in the air in
quantities sufficient to roduce ex losive or ignitable
mixtures.
Class II: Class II locations are those that are hazardous
because of the resence of combustible dust.
Class Ill: Class Ill locations are those that are hazardous
because of the resence of easily ignitable fibers or
flyings, but in which such fibers or flyings are not likely
to be in sus ension in the air in quantities sufficient to
roduce ignitable mixtures.
Division 1: A Division 1 location is a location (a) in
which hazardous concentrations of flammable gases or
va ors exist continuously, intermittently, or eriodically
under normal o erating conditions; or (b) hazardous
concentrations of such gases or va ors may exist
frequently because of re air or maintenance o erations
or because of leakage; or (c) breakdown or faulty
o eration of equi ment or rocesses that might release
hazardous concentrations of flammable gases or va ors
occur and might also cause simultaneous failure of
electric equi ment.
Group A: Grou A atmos heres contain acetylene.
Group B: Grou B atmos heres contain such chemi-
cals as butadiene, hydrogen ethylene oxide
(or gases or va ors of equivalent hazard to
hydrogen, such as manufactured gas), or
ro ylene oxide.
Group C: Grou C atmos heres contain such chemicals
as acetaldehyde, cyclo ro ane, diethyl
ether, ethylene, iso rene, or unsymmetrical
dimethyl hydrazine (UDMH).
Group D: Grou D atmos heres contain such chemicals
as acetone, acrylonitrile, alcohols, ammonia,
Operation and Installation Instructions
MODEL ZS-30
Intrinsically Safe Module
Fire Safety
Siemens Building Technologies, Inc.
8 Fernwood Road
Florham Park, New Jersey 0 932
Siemens Building Technologies, Ltd.
2 Kenview Boulevard
Brampton, Ontario L6T 5E4 CN
P/N 315-024056-17

2
benzine, benzol, butane, ethylene dichlo-
ride, gasoline, hexane, lacquer solvent
va ors, na htha, natural gas, ro ane,
ro ylene, styrene, vinyl acetate, vinyl
chloride, or xylenes.
Group E: Atmos heres containing combustible metal
dusts regardless of resistivity, or other
combustible dusts of similarly hazardous
characteristics having resistivity of less than
105 ohm/centimeter.
Group F: Atmos heres containing carbon black,
charcoal, coal, or coke dusts which have
more than 8 ercent total.
Group G: Atmos heres containing combustible dusts
having resistivity of 105 ohm/centimeter or
greater.
Description
The heat and smoke actuated detectors are located
in a hazardous location. A Class B two wire detector
circuit extends back to the non-hazardous location
where connections are made to terminals 5 (out ut
ground) and 1 (out ut) of the Diode Shunt Barrier
located in the system control anel cabinet (or in a
se arate enclosure). Under normal o erating condi-
tions voltage and current in the hazardous locations
are at levels known to be safe for intrinsically safe
electrical equi ment o erating in Grou A atmo-
s heres. However, should any combination of two
inde endent faults occur ( lus field wiring failures)
within the system, the barrier will revent the a ear-
ance of excessive voltage and currents in the hazard-
ous location. The ZS-30 module is art of a low
voltage control anel and is connected to the barrier
and detector circuit. The module is mounted on a
System 3 anel along with the control unit. The
intrinsically safe module is interconnected to System 3
modules bus wire cable and draws its ower from the
System 3 ower su ly through the control unit. The
module rovides regulated voltage to the detectors in
the hazardous locations through the Diode Shunt
Barrier. It also detects and generates trouble and
alarm conditions. Alarm and trouble conditions are
indicated by red and yellow LEDs on the anel on the
intrinsically safe zone, and corres onding high-going
electronic signals are assed to the control unit. The
detector circuit consists of u to ten DI-3IS ionization-
ty e smoke detectors or u to five S121 or S122 flame
detectors, in addition to any number of mechanical
(non-energy storing) shorting devices. The detector
circuit is terminated by a 5.6K ohm end of line resistor.
Installation
Refer to Figures 1-3 below when installing the ZS-30.
The Diode Barrier may be located in the main control
anel or in a se arate enclosure; but, in either case,
care must be exercised in installation.
System 3 chassis ground must e removed. Each
du licate (redundant) grounding conductor should be
connected to the grounding connections on the barrier
device and run directly to the ground electrode  not
via other aths leading to that electrode.
Each ground wire must be 14 or 18 AWG wire and
should not exceed an im edance of 1 ohm. All ground
wires should be connected se arately to the same
ground location. Wiring connected to the barrier out ut
Figure 1
Field Assem ly of Diode Barrier

3
(terminals 1 and 5) must be grou ed with intrinsically
safe circuits and must not run in conduits and wire-
ways containing non-intrinsically safe circuits.
Wiring from the control unit enclosure or se arate
diode barrier enclosure to the intrinsically safe zone
must be rigid conduit, and the conduit should be sealed
off from the hazardous area at the barrier wall by using
standard EY conduit seals to isolate the hazardous
atmos here from the control equi ment. Chico X fiber
and Chico A sealing com ound must be used to make
the seal. Wiring in the hazardous area may be either
limited energy shielded cable (Siemens Building
Technologies, Inc. P/N 465-514391) or any ty e of
general ur ose wire. The diode barrier may be
located either in the control unit enclosure or in its own
enclosure. Pro er assembly and conduit are essential;
follow Figure 1.
Non-energy storing devices such as a manual station
may be connected in the detector loo without jeo ar-
Figure 2
Barrier La el
dizing the intrinsically safe characteristics of the
system. Such devices must be connected in arallel
with the barrier out ut, must not contain any energy
storing com onent(s), and must be o erationally
a roved by Factory Mutual for the intended ur ose.
Maximum detector loo resistance must not exceed
50 ohms, exclusive of the 5.6K ohm end of line resistor.
The maximum inductance and ca acitance for cables
or wires connected to the barrier out ut should not
exceed the following values for each grou .
Note: FM Control Document  there are to be no changes to this document without prior Factory Mutual approval.
Maximum Maximum Capacitance
Inductance xcluding Detector
in mH Capacitance in µF
Group A 20 .1
Group B 20 .1
Group C, ,F 80 .3
Group D,G 150 .8

NOTES:
1. TROUBLE AND ALARM OUTPUT:
OPEN CIRCUIT VOLTAGE 22 VDC
SHORT CIRCUIT CURRENT 30 mA
2. WHEN ZS-30 IS USED, SYSTEM CHASSIS GROUND CONNECTION MUST BE
REMOVED AND TERMINALS AND 7 OF DIODE SHUNT BARRIER MUST BE
INDEPENDENTLY CONNECTED TO CHASSIS GROUND.
3. MAXIMUM LOOP RESISTANCE MUST NOT EXCEED 0 OHMS.
4. A MAXIMUM OF TEN DI-3IS IONIZATION DETECTORS OR UP TO
FIVE S121 OR S122 FLAME DETECTORS CAN BE USED IN ADDITION TO
MECHANICAL (NON-ENERGY STORING) SHORTING DEVICES.
. MAXIMUM SAFE SYSTEM VOLTAGE IS 2 0 VAC.
Figure 3
Wiring Diagram
ZS-30 Intrinsically Safe Zone
P/N 315-024056-17
6. REFER TO TEXT FOR LIMITATIONS AND DEFINITION OF THE HAZARDOUS
AREA.
7. ONLY MECHANICAL (NON-ENERGY STORING) SHORTING DEVICES SUCH AS
THE MS- 1 MANUAL STATION MAY BE USED.
8. WARNING: DO NOT MAKE ANY CONNECTION TO TERMINAL 6 OF THE DI-3IS
BASE. SUCH A CONNECTION WOULD VOID USE IN AN INTRINSICALLY SAFE
APPLICATION.
9. IN ADDITION, S121 AND S122 ARE ALSO APPROVED FOR USE IN CLASS II
AND CLASS III, GROUPS E, F, AND G.