Ex p Control unit
SILAS
pz
Electrical connections
Rev. 0
A1-37S2-7D0001_pz_Manual_Exp-Control-Unit_20210923_0_en.docx
Page 41 of 88
Terminal row “X5”
The Ex p control unit has one floating
changeover contact K3 and one floating
changeover contact K4 for signaling and
processing signals. The associated switching
function can be set in the Ex p control unit via
the WEB interface and is freely programmable.
The maximum switching current is 1 A.
Terminal
Connection
Function
1
K3 – COM
Common contact
2
K3 – NO
Normally open contact
3
K3 – NC
Normally closed contact
4 / 5
PE
6
K4 – COM
Common contact
7
K4 – NO
Normally open contact
8
K4 – NC
Normally closed contact
Terminal row “X8”
ATTENTION
MATERIAL DAMAGE DUE TO OVERCURRENT IN THE CONTROL ELECTRONICS.
Welding of the enabling relays or destruction of the electronics by inductive
loads.
The Ex p enable (Relay K1, X8 terminal 2 and 3) can only be operated
in conjunction with a mains fuse (max 5 A, 1,500 A switching capacity,
fast).
Supplement inductive loads with suitable interference suppression
measures. See chapter 6.1.4.
The supply voltage is connected to terminal row X8.
The application within the pressurized enclosure is enabled
by the Ex p control unit. There may be no voltage in the
pressurized enclosure when the Ex p control unit is
deactivated.
The Ex p enable can switch a maximum of one circuit of one
phase with neutral conductor and can be loaded with a maximum of 5 A. If the
current load within the pressurized enclosure has more than 5 A or more than
one phase, this must be implemented with a separately certified Ex d
preconductor which is controlled by the Ex p control unit.
Terminal
Connection
Function
1
PE
PE power supply
2
L´ (+)
Enable phase Ex p device
3
N´ (-)
Enable neutral Ex p device
