Safety and commissioning information for Ex areas
14.2 Dry-running protection for centrifugal pumps by active power monitoring
SIMOCODE pro
322 System Manual, 05/2019, A5E40507475002A/RS-AD/004
14.2.3.5 Line protection
Cable / conductor cross sections
Avoid impermissible maximum cable surface temperatures by correctly dimensioning the
cross sections!
Choose a sufficient cable cross section, especially for heavy-starting motors CLASS 20 to
CLASS 40 (see Chapter
Short-circuit protection with fuses for motor feeders for short-
currents up to 100 kA and 690 V for 1st generation current / voltage measuring module
(Page 364))!
14.2.3.6 Test
General system tests
SIMOCODE pro offers you a method of checking the dry-running protection chain (incl.
actuators such as contactors, circuit breakers). Use this, for example, to carry out the test
according to IEC 60079-17 or VDE 0118.
The test encompasses a full function test. For this purpose, all 3 test phases are to be
carried out (hardware test, current feedback, motor protection tripping, see below). The test
can be carried out using the "TEST / RESET" buttons provided, or automatically via the bus.
It is not necessary to load the test variable (active power) to check if the measured values
are correct.
Note
Must be carried out periodically
You must repeat the general system tests at least every 3
years (cf. IEC 60079-17,
4.4.2).
Test phases of the general system test
The hardware is tested, all LEDs and displays are activated, including the lamp control.
Contactor controls remain unchanged.
● Phase 1: Hardware test / lamp test (0 s to 2 s)
● Phase 2: Hardware test results (2 s to 5 s): If there is a fault, the "HW fault basic unit"
fault is triggered. If there is no fault:
– The "GEN. FAULT" LED flashes if no main current is flowing
– The "GEN. FAULT" LED flickers if main current is flowing in all 3 phases
(exception: with a "1-phase load" in one phase).
● Phase 3: Relay test (> 5 s): If testing is carried out with tripping, the contactor controls are
deactivated. The contactor control can only be shut down by means of the "Test 1"
function block and in the "Local 1-3" operating mode, using the "TEST / RESET" button
on the basic unit / operator panel.
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