wohner OMUS User manual

OMUS® user manual
Revision 8, March 2017
OMUS®
Electronic hybrid switch for resistive loads.
User manual
Revision 8, March 2017

OMUS® user manual
Revision 8, March 2017
Contents
1Design variants ....................................................................................................................................................... 38
2OMUS®Overview.................................................................................................................................................... 39
2.1 Application............................................................................................................................................................ 40
2.2 Incorporation of OMUS®into process control....................................................................................................... 41
2.3 Galvanic isolation & short-circuit protection ........................................................................................................ 41
2.4 Line protection...................................................................................................................................................... 43
2.5 Switching processes in the hybrid switch ............................................................................................................. 43
2.6 Adhering to limit values in switching processes ................................................................................................... 43
2.7 Adjustability of the power output......................................................................................................................... 46
2.8 Suitability of the application ................................................................................................................................. 47
3Safety instructions / Installation instructions.......................................................................................................... 48
4Product table.......................................................................................................................................................... 49
5Commissioning ....................................................................................................................................................... 50
5.1 Connections .......................................................................................................................................................... 50
5.2 Installing and connecting the main circuits........................................................................................................... 51
5.3 Meaning of the LED indicators.............................................................................................................................. 52
5.4 Disassembly and replacing devices ....................................................................................................................... 52
5.5 Replacing a fuse .................................................................................................................................................... 53
5.6 Checklist................................................................................................................................................................ 54
6User interface......................................................................................................................................................... 55
6.1 Front view ............................................................................................................................................................. 55
6.2 Overview of display functions............................................................................................................................... 56
6.3 Eplan symbol......................................................................................................................................................... 57
6.4 Switching variants ................................................................................................................................................. 58
7Configuration of OMUS®......................................................................................................................................... 59
7.1 Menu structure..................................................................................................................................................... 60
7.2 Three-phase settings............................................................................................................................................. 61
7.3 Single-phase settings ............................................................................................................................................ 62
7.4 Restoring to factory settings................................................................................................................................. 63
7.5 Standby ................................................................................................................................................................. 63
8Function description ............................................................................................................................................... 64
8.1 Auto(matic) mode................................................................................................................................................. 64
8.2 Settings menu ....................................................................................................................................................... 64
8.3 Manual mode........................................................................................................................................................ 64
8.4 Warning ................................................................................................................................................................ 65
8.5 Error...................................................................................................................................................................... 66
8.6 Acknowledgement of messages............................................................................................................................ 67
8.7 Interruption .......................................................................................................................................................... 67
9Technical data ........................................................................................................................................................ 68

OMUS® user manual
Revision 8, March 2017
1 Design variants
OMUS®30Compact
Type
Pack Size
Weight
kg/100
Part No.
OMUS®30Compact, IEC
1
45.2
36 152
OMUS®30Compact, UL and IEC
1
45.2
36 157
OMUS®60Classic
Type
Pack Size
Weight
kg/100
Part No.
OMUS®60Classic, IEC
1
45.8
36 153
OMUS®60Classic, UL and IEC
1
45.8
36 158
OMUS®CrossBoard
Type
Pack Size
Weight
kg/100
Part No.
OMUS®Crossboard, IEC
1
35.7
36 154
OMUS®Crossboard, UL and IEC
1
35.7
36 159

OMUS® user manual
Revision 8, March 2017
2 OMUS®Overview
OMUS®
Electronic hybrid switch for resistive loads.
The OMUS®electronic hybrid switch is a compact switching device with a width of 36 mm. The
hybrid switch is composed of a combination of relay contacts and power semi-conductors,
integrated short-circuit protection as well as electronic current and temperature monitoring for
operational switching of resistive loads (IEC up to 25 A / 400V AC; UL up to 20A / 480V AC).
The universal CrossLink-interface at the connection side enables fast electrical and
mechanical connection with various busbar systems.
Busbar adapter
(*version 30Compact)
Load plug
Esc / Reset button
Control plug
Hinged cover
Lead sealing

OMUS® user manual
Revision 8, March 2017
2.1 Application
The OMUS®hybrid switch has been developed for areas of application in which contactors,
overload relays, solid state relays and mechanical switches have previously been used.
This device was designed for the frequent switching of:
•single-pole resistive loads (phase-neutral) and
•three-pole resistive loads
This is a product for environment A (industry) regarding EMC. In environment B (household)
this device may cause undesirable interference; in this case the user has to find appropriate
counteraction to reduce electromagnetic interference. No powerful electrostatic charges may
be transferred to the OMUS®from the load side. An external switching element is required for
galvanic isolation. This could be a contactor or circuit breaker, for example. In a non-
operational status, the OMUS®error relay will issue a signal. In order to interrupt an
unintentional continuous current flow in case of an error, an external switchgear must ensure
the interruption of the load circuit. The short-circuit protection is implemented via integrated
fuses.
The combination of the functions
•Hybrid switch
•Feed
•Fuse
•Monitoring
enables a maximum space advantage in comparison to a group composition of three discrete
devices with comparable properties.

OMUS® user manual
Revision 8, March 2017
2.2 Incorporation of OMUS®into process control
OMUS®can be actuated with the help of a programmable logic controller (PLC). The precise
specification for the input signals of OMUS®is described in detail, in chapter 9 Technical data,
as well as in 2.5 Switching processes in the hybrid switch. The defined limit values such as a
maximum switching frequency of 1Hz and minimum on and off duration of 100ms must be
strictly adhered to in order to guarantee proper operation.
OMUS®possesses numerous self-diagnostic and safety monitoring mechanisms. Warnings
and errors are routed to the analysis unit via the signal relays.
The incorporation and active processing of the warning or error messages into the
corresponding control of the system is necessary in order to achieve the maximum
system dependability.
If the limit values are exceeded, e.g. the minimum switch on time, OMUS®has a software-
based self-diagnostic system, and will ignore unreliable control commands. The incorrect
actuation will not be issued by a signal.
2.3 Galvanic isolation & short-circuit protection
The device does not have an internal galvanic isolation. In the event of an error, OMUS®
switches off as normal without being fully galvanically isolated. An external switching
element is required for galvanic isolation. The galvanic isolation can be realized on the part
of the feed.
Galvanic isolation on the part of the feed:
load
load
load
load

OMUS® user manual
Revision 8, March 2017
The galvanic isolation can also be realized between OMUS®and corresponding load.
Galvanic isolation on the part of the load:
Common devices for the implementation of a galvanic isolation are contactors or circuit
breakers. In a non-operational status, the OMUS®error relay will issue a signal. In order to
interrupt an unintentional continuous current flow in case of an error, an external switchgear
must ensure the interruption of the load circuit.
The short-circuit protection is implemented via integrated fuses. An upstream short-circuit
protection module is only required from an uninfluenced short-circuit current ICP above 30kA.
For the UL design (with internal fuse Class CC 30A according to UL), an SCCR value of 30kA
was verified. The electronic hybrid switch OMUS®complies with coordination type 1.
load

OMUS® user manual
2.4 Line protection
The line protection of the connected line is realized by setting the correct current limit (16A,
20A or 25A). In order to ensure line protection with OMUS®depending on the configured
current, at least the following wire cross-sections at the load plug have to be adhered to. The
following values comply with the single installation of OMUS®. The specified wire cross-
sections are additionally depending on the deratings for side-by-side installation (see chapter
9 Technical data) and if necessary installation type!
Connected
wire cross-
section
Permitted
adjustable current
limits
Permitted load current
(load plug with screw
terminals
Art.-Nr. 36918)
**Permitted load current
(load plug with spring
terminals
Art.-Nr. 36916)
2,5mm²
16A, 20A
20A
16A
4mm²
16A, 20A, 25A
25A
20A
*6mm²
16A, 20A, 25A
25A
20A
*higher wire cross-section enables better heat dissipation
**spare component
If a wire cross-section below 2,5mm² is used, the line protection has to be realized either by
using smaller fuses within OMUS®or adapting the pre-fuse.
2.5 Switching processes in the hybrid switch
OMUS®combines the advantages of power semi-conductor and relay technology. The
interplay of both technologies is referred as hybrid switch.WhenOMUSswitches on, the semi-
conductor carries the current so that the relay can be switched on with low wear. The
continuous current thenflows through the relay, which generates significantly lower power loss
in comparison to the semi-conductor. When OMUS switches off, the semi-conductor once
again carries the current in the hybrid switch in order to open the relay contact with minimal
current arcing. In comparison to apurely relay solution, this functionality allows for a
significantly longer lifetime. Compared to apure semi-conductor solution, the hybrid switch
operates with much greater efficiency. The high degree of efficiency translates to lower power
loss in the device.
2.6 Adhering to limit values in switching processes
The electronics switch the load on and off at the zero crossing of the load voltage. The switch
on and off commands are carried out after a delay (max. 80ms). The minimum duration of the
switch on impulse has to be 100ms. The maximum switching frequency may not exceed 1Hz.
The minimum load current is 2A. The proper functionality of the device cannot be guaranteed
if the limit parameters are not adhered to. The electronics continuously monitor the
correct
Revision 8, March 2017

OMUS® user manual
Revision 8, March 2017
performance of the control commands and the power consumption in all phases. Switching
processes must be conducted in line with the following rules in order to achieve a high switch
rate, long lifetime and low power loss:
•Maximum switching frequency f1 Hz
•Minimum switch on duration tON 100ms
•Minimum switch off duration tOFF 100ms
•Minimum load current Inc min 2A
•Usage only with connected functional ground PE
(Input 2 control plug)
Note: Please complete commissioning in conjunction with working through the checklist in
subsection 5.6!
Example: Switch on and off process with minimum switching duration of 100ms:
Designation
Limit value
In example
tswitch on delay
max. 80ms
approx. 13ms
tswitch off delay
max. 80ms
approx. 17ms
tswitching signal(duration of the switch on impulse)
min. 100ms
approx. 100ms
tON: (Switch on duration of load)
min. 100ms
approx. 100ms
Power output 3-phase at 25A load current:
•20W power loss in continuous operation (all relays permanently on, tRelay ON >> 1s)
•temporary 3-fold power loss during switch on or switch off (tTriac ON)
tswitch on delay
tSwitching signal
tswitch off delay
tON

OMUS® user manual
Revision 8, March 2017
Exemplary switch on and off process with hybrid switches in detail (current flow)
Designation
Limit value
In example
tTriac ON (Switch on duration of Triac)
max. 20ms
approx. 8ms switch on
approx. 12ms switch off
tRelay ON (Switch on duration of relay)
min. 80ms
approx. 80ms
tON (Switch on duration of load)
min. 100ms
approx. 100ms
Example: Switching cycle with max. switching frequency 1Hz and min. switch on duration 100ms
Incorrect actuation (in this case: 2Hz) is ignored!
Designation
Limit value
In example
tPeriod min (Minimal period duration between
impulses)
min. 1000ms
approx. 1000ms
tOFF (Switch on duration of load)
min. 100ms
approx. 900ms
tTriac ON
tTriac ON
tRelay ON
tON
tON
tON
2Hz actuation
tPeriod min
tOFF