Electrical connections
Ex p Control Unit
SIEMENS Set
Page 30 of 80
01-37A2-7D0004_SIEMENS_Manual_Exp-Control-Unit_20220216_0_en.docx
Rev. 0
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6
Electrical connections
DANGER
DEATH OR SERIOUS PHYSICAL INJURY DUE TO WORK ON LIVE PARTS.
Fatal injury from electrical current.
Observe the five safety rules for work on electrical systems:
Disconnect mains; protect against unintended reconnection; verify
the absence of voltage; earth and short-circuit; cover or safeguard
nearby live parts.
Connection terminals with the type of protection “Ex e” or “Ex i” are on the
connection board of the Ex p control unit.
Terminal row
Function
Ex e
X3
Power supply
X5
2x signal relay, 1x CO each
X8
Enable, with voltage
X12
Indicator relay, 4x NO
X7
Purge gas valve, empty contacts
X8
Purge gas outlet, LAN
Ex i
X9
Bypass, temperature sensor 1
X16
Parameter enable, temperature sensor 2
X14
Main switch, temperature sensor 3
X13
opt. sensor 1 [ia]
X15
opt. sensor 2 [ib]
X17
p-operator panel
Measurement
card
Pressure measurement card