10
D5244
- SIL 2 - SIL 3 Digital Relay Output , Loop Powered
G.M. International ISM0271-5
D5244 series are isolated Intrinsically Safe Associated Apparatus installed into standard EN50022 T35 DIN-Rail located in Safe Area or Zone 2, Group IIC, Temperature T4,
Hazardous Area (according to EN/IEC60079-15) within the specified operating temperature limits Tamb –40 to +70 °C, and connected to equipment with a maximum limit for
AC power supply Um of 250 Vrms. Not to be connected to control equipment that uses or generates more than 250 Vrms or Vdc with respect to earth ground.
D5244 series must be installed, operated and maintained only by qualified personnel, in accordance to the relevant national/international installation standards (e.g. IEC/EN60079-14
Electrical apparatus for explosive gas atmospheres - Part 14: Electrical installations in hazardous areas (other than mines)), following the established installation rules, particular care
shall be given to segregation and clear identification of I.S. conductors from non I.S. ones.
De-energize power source (turn off power supply voltage) before plug or unplug the terminal blocks when installed in Hazardous Area or unless area is known to be nonhazardous.
Warning: substitution of components may impair Intrinsic Safety and suitability for Zone 2.
Warning: de-energize main power source (turn off power supply voltage) and disconnect plug-in terminal blocks before opening the enclosure to avoid electrical shock
when connected to live hazardous potential
.
Explosion Hazard: to prevent ignition of flammable or combustible atmospheres, disconnect power before servicing or unless area is known to be nonhazardous.
Failure to properly installation or use of the equipment may risk to damage the unit or severe personal injury.
The unit cannot be repaired by the end user and must be returned to the manufacturer or his authorized representative.
Any unauthorized modification must be avoided.
Warning
Operation
The single and dual channel DIN Rail and Termination Boards Digital Relay Output, models D5244S and D5244D, are loop powered digital output modules enabling a Safe Area loop
voltage signal, to control a device in Hazardous Area, providing 2 port isolation (input/output). Outputs are galvanically isolated.
Typical applications include switching of Hazardous Area circuits, changing of polarities and sounder tones, calibrating of strain gauge bridges, resetting of field devices, testing of fire
detectors. Each output channel provides a SPDT relay, with two contacts defined NO (Normally Open) and NC (Normally Close) when the output relay is de-energized. Considering each
channel NE (Normally Energized), the output relay is energized,so that NO contact is closed (useful for NE loads or Hazardous Area circuits) and NC contact is open (useful for ND loads
or Hazardous Area circuits). The safe state is reached when the channel and the output relay are de-energized, so that NO contact is open (de-energizing loads or Hazardous Area
circuits) and NC contact is closed (energizing loads or Hazardous Area circuits).
Installation
D5244 series modules are housed in a plastic enclosure suitable for installation on T35 DIN-Rail according to EN50022, with or without Power Bus or
on customized Termination Board. D5244 unit can be mounted with any orientation over the entire ambient temperature range.
Electrical connection of conductors up to 2.5 mm² are accommodated by polarized plug-in removable screw terminal blocks which can be plugged in/out into a powered unit without
suffering or causing any damage
(for Zone 2 installations check the area to be nonhazardous before servicing)
.
The wiring cables have to be proportionate in base to the current and the length of the cable.
On the section “Function Diagram” and enclosure side a block diagram identifies all connections.
Identify the function and location of each connection terminal using the wiring diagram on the corresponding section.
Intrinsically Safe conductors must be identified and segregated from non I.S. and wired in accordance to the relevant national/international installation standards (e.g. EN/IEC60079-14
Electrical apparatus for explosive gas atmospheres - Part 14: Electrical installations in hazardous areas (other than mines)), make sure that conductors are well isolated from each other
and do not produce any unintentional connection.
The enclosure provides, according to EN60529, an IP20 minimum degree of mechanical protection (or similar to NEMA Standard 250 type 1) for indoor installation, outdoor installation
requires an additional enclosure with higher degree of protection (i.e. IP54 to IP65 or NEMA type 12-13) consistent with the effective operating environment of the specific installation.
Units must be protected against dirt, dust, extreme mechanical (e.g. vibration, impact and shock) and thermal stress, and casual contacts.
If enclosure needs to be cleaned use only a cloth lightly moistened by a mixture of detergent in water.
Electrostatic Hazard: to avoid electrostatic hazard, the enclosure of D5244E must be cleaned only with a damp or antistatic cloth.
Any penetration of cleaning liquid must be avoided to prevent damage to the unit. Any unauthorized card modification must be avoided.
According to EN61010, D5244 series must be connected to SELV or SELV-E supplies.
Warning: de-energize main power source (turn off power supply voltage) and disconnect plug-in terminal blocks before opening the enclosure to avoid electrical shock
when connected to live hazardous potential
.
Start-up
Before powering the unit check that all wires are properly connected, particularly supply conductors and their polarity, input and output wires, also check that Intrinsically Safe conductors
and cable trays are segregated (no direct contacts with other non I.S. conductors) and identified either by color coding, preferably blue, or by marking.
Check conductors for exposed wires that could touch each other causing dangerous unwanted shorts.
The status yellow LED must be in accordance with the condition of the corresponding input line.
Testing procedure at T-proof
The proof test shall be performed to reveal dangerous faults which are undetected by diagnostic. This means that it is necessary to specify how dangerous undetected fault,
which have been noted during the FMEDA, can be revealed during proof test.
The Proof test
consists of the following steps:
Steps
Action
1
Bypass the safety-related PLC or take any other appropriate action to avoid a false trip.
2
For the single channel, verify the input-to-output channel functionality:
For the NO contact, the output load is normally energized (NE) when the input channel is enabled, while the de-activation (Safe State) of the input channel de-
energizes the load; For the NC contact, the output load is normally de-energized (ND) when the input channel is enabled, while the de-activation (Safe State) of
the input channel energizes the load. The channel functionality must be verified in the 18 to 30 Vdc loop supply voltage range. To enable or disable the input
channel, connect a DC power supply to the input terminals. To check the ohmic continuity of the NO and NC contacts, connect an ohmmeter in series to the
NO-COM output contact and another one in series with the NC-COM output contact. Perform the following procedure:
1. Do not enable (DC loop supply voltage < 15 V) the input channel (terminals 1-2 or 3-4) of the unit under test and verify that the ohmic continuity is
absent at the NO-COM output contact (terminals 14-15/16 or 18-19/20), while it is present at the NC-COM output contact (terminals 13-15/16 or
17-19/20), so that the
1
st
requisite is verified
;
2. Enable (DC loop supply voltage
≥
18 V) the input channel (terminals 1-2 or 3-4) of the unit under test and verify that the ohmic continuity is present at
the NO-COM output contact (terminals 14-15/16 or 18-19/20), while it is absent at the NC-COM output contact (terminals 13-15/16 or 17-19/20), so that
the
2
nd
requisite is verified
.
3
Remove the bypass from the safety-related PLC or restore normal operation.
This test will reveal approximately 100 % of possible Dangerous Undetected failures in the repeater.