Electrical connections
Ex p control unit
Motor Purge Controller
Page 38 of 96
01-37A2-7D0003_Operating instructions_MPC_20210923_0_en.docx
Rev. 0
6.2.1.2
Terminal row “X5”
A potential-free changeover contact K3
and K4 is available on the Ex p control
unit for reporting 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
Foot contact
2
K3 – NO
Normally open contact
3
K3 – NC
Normally closed contact
4 / 5
PE
6
K4 – COM
Foot contact
7
K4 – NO
Normally open contact
8
K4 – NC
Normally closed contact
6.2.1.3
Terminal row “X8”
ATTENTION
PROPERTY DAMAGE CAUSED BY OVERCURRENT TO THE CONTROL
ELECTRONICS.
Welding of the release relays or destruction of the electronics by inductive
loads.
The Ex p release (relay K1, X8 terminals 2 and 3) can only be operated
in conjunction with a mains fuse (max. 5 A, 1,500 A switching
capacity, fast-acting).
Supplement inductive loads with suitable interference suppression
measures. See chapter 6.1.4.
The supply voltage is connected to terminal row X8.
Terminal
Connection
Function
1
PE
PE power supply
2
L´ (+)
Release phase Ex p equipment
3
N´ (-)
Release neutral Ex p equipment
The application within the pressurised enclosure is released by the Ex p control
unit. There must be no voltage in the pressurised enclosure when the Ex p
control is deactivated.
The Ex p release can switch a maximum of one circuit of one phase with a neutral
conductor and be loaded with a maximum of 5 A. If the current load inside the
pressurised enclosure is more than 5 A or more than one phase, this must be
carried out with a separately certified Ex d contactor, which is controlled by the
Ex p control unit.
