Honeywell VPX Series Installation Instructions Manual page 4

MICRO SWITCH VPX Series
Table 2. Proof Test Procedure
Step Action
1 Bypass safety PLC and/or take alternative actions to avoid false trip.
2 Visually inspect the VPX Valve Position Indicator for signs of wear or damage.
3 Perform the proof test by manually operating the valve being monitored and perform a full stroke.
4 Monitor the visual indication and switch outputs and record test results as per local procedure.
5 Remove the safety PLC bypass and restore the safety system for normal operation.
MCTF Mechanical Life(Cycles)
S.NO Catalog
VPX Series - Electro-
mechanical snap-
1
action switches loaded Confidence Limit
at 16 A, 250 Vac
VPX Series - Electro-
mechanical snap-
2
action switches loaded Confidence Limit
at 0.5 A, 250 Vdc
VPX Series - Intrensi-
3 cally safe proximity
Confidence Limit
switches
Notes: HFT: Hardware Fault Tolerance;
1
Figure 3. Intrinsically Safe Zone Diagram
Proximity
Switch #1
Proximity
Switch #2
HAZARDOUS (CLASSIFIED) LOCATION
INTRINSICALLY SAFE PROXIMITY SWITCHES
A VPX equipped with proximity switches is considered intrinsi-
cally safe when used with an appropriate switching amplifier,
also referred to as an associated apparatus, which complies
with EN 60947-5-6:2000 or IEC 60947-5-6:1999. The ampli-
fier contains a dc source to supply the control circuit and is
controlled by the variable internal resistance of the proximity
switch. This amplifier is placed outside of the hazardous area. A
diagram of the typical installation is shown in Figure 3.
Cable capacitance, Ccable, plus intrinsically safe equipment
capacitance, Ci, must be less than the marked capacitance, C
shown on any associated apparatus used. The same applies for
4 sensing.honeywell.com
MCTF Electrical Life(Cycles)
Value Reference
> 500,000 with > 25,000 with
Single Sided SIRA TA Single Sided
16002/01 Confidence
of 100%. Limit of 50%
> 500,000 with > 10,000 with
Single Sided SIRA TA Single Sided
16002/01 Confidence
of 100%. Limit of 100%.
> 500,000 with > 50,000 with
Single Sided SIRA TA Single Sided
16004/01 Confidence
of 100%. Limit of 100%.
SC: Systematic Capability; PTI: Proof Test Interval;
2 3
VPX VALVE POSITION INDICATOR
Ui = 16V
Ii = 25 mA
Pi = 34 mW
Ci = 100 nF
Li = 100 µH
Ui = 16V
Ii = 25 mA
Pi = 34 mW
Ci = 100 nF
Li = 100 µH
Zone 0, 1, 2
Value Reference SIL Level
SIRA TA
SIL 3
16001/01
SIRA TA
SIL 3
16001/01
SIRA TA SIL 3
16003/01
PT: Product Type
4
A certi ed associated apparatus with
Switch 1 L+
Switch 1 L-
Switch 2 L+
Switch 2 L-
inductance (Lcable, Li and Lo, respectively). Where the cable
capacitance and inductance per foot are not known, the follow-
ing values shall be used: Ccable = 200 pF/m., Lcable = 1 μH/m.
The associated apparatus output current must be limited by a
resistor such that the output voltage-current plot is a straight
line drawn between open-circuit voltage and short-circuit cur-
rent. The associated apparatus must be installed in accordance
with its manufacturer's control drawing. When required by the
manufacturer's control drawing, the associated apparatus must
be connected to a suitable ground electrode per local instal-
lation codes, as applicable. The resistance of the ground path
,
O
must be less than 1 Ohm. Associated apparatus must not be
ISSUE F
Highest SIL
HFT SC PTI PT
1 2 3
0 SC 3 1 year Type A
0 SC 3 1 year Type A
SC 3
0 1 year Type A
SWITCHING AMPLIFIER
zone and group approval and
with entity parameters:
Uo ≤ Ui
Io ≤ Ii
Po ≤ Pi
Co ≥ Ci + Ccable
Lo ≥ Li + Lcable
NON-HAZARDOUS LOCATION
32312068
Staandard Reference
4
IEC
SIRA FSP
61508-2:
16005/00
2010
IEC
SIRA FSP
61508-2:
16005/00
2010
IEC
SIRA FSP
61508-2:
16005/00
2010