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Series 5A and Series 5B I.S. Valve Status Monitor
Installation, Operation and Maintenance Manual
11. Field Wiring
Bray Series 5A and 5B I.S. are assembled with
numbered terminal blocks on a printed circuit
board designed to conform to Intrinsically Safe
requirements. Bray Series 5A VSMs contain a 4-pole
terminal block, while the Series 5B VSMs contain a
12-pole terminal block. All switches are pre-wired
into the terminal block. Several features have been
designed to help ease field wiring:
• Terminal blocks are angled towards the cover
opening.
• Wiring diagram is attached to the inside of cover.
• Two side conduit entries are available for all
models. Additional rear conduit entry available
on S5B resin trim.
Turn off all power and lock out service panel before
installing or modifying any electrical wiring.
Observe all applicable safety regulations for
electrical equipment installed in potentially
explosive (hazardous) locations.
NOTICE
• Do not re-machine the conduit entry threads or
create any new holes in the enclosure.
• Do not remove the screw-in conduit plugs
(aluminum housing) or peel-off decal (resin
housing) until it is time to wire into the unit's
terminal blocks.
• Do not tamper with or modify any exposed
O-rings or gaskets.
• A minimum of 18 AWG wire is recommended
for all field wiring.
• The terminals inside the VSM accept wire sizes
ranging from 14 to 20 AWG.
• The conduit connections must be properly sealed
to maintain the weatherproof integrity of the
VSM enclosure.
10. Accessing Internal
Components
Access to the S5AB internals is done by removing
the cover from the unit. The steps for removal are
as follows:
Do not open when energized or an explosive
atmosphere is present.
10.1 Cover Removal
1. Loosen captive cover bolts. The S5A contains
4 bolts and the S5B contain 6 bolts located
around the perimeter of the unit.
2. Pull the cover up and away from unit. Do not
use a wedge device to remove cover.
3. Perform internal adjustment. Reference position
adjustment section.
10.2 Cover Installation
1. Ensure o-ring is seated in the o-ring groove.
2. Press on cover ensuring captive bolts are aligned
with the bolt holes.
3. Tighten cover bolts to 13-18 lb-in [1.5-2.0 Nm]
in a cross pattern.
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Summary of Contents for 5A Series
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