5
Description
High-integrity self-monitoring temperature switch with periodic self-checking routine to be used in
conjunction with a resistance thermometer type TRG 5-53, TRG 5-54, TRG 5-55 or TRG 5-57.
The equipment operates as a safety temperature monitor, or in combination with an external lock-out
in accordance with VDE 06 as a safety temperature limiter. An alarm is given as soon as the tempera-
ture exceeds a preset limit. Application in steam boilers and pressurized hot-water plants operating
without constant supervision (TRD 604) as well as any other kind of heat generating units.
Explanantory Notes
Function
The temperature switch type TRS 5-6 is a two channel unit provided with an automatic periodic self-
checking logic unit, in accordance with DIN 3440/VDE 06 (regulations on protection circuits for firing
equipment of furnaces). The two channels are designed to monitor the operation of each other. The
integrity of the resistance thermometer is continuously monitored by the TRS 5-6. Unless it finds a fault,
this internal test does not interfere with the output contacts of the temperature switch and therefore
the plant operation is not interrupted. A manual test push button is also provided. When the push button
“Test I” is pressed, it simulates a fault in the resistance thermometer There is also a toggle switch
“Test II / Inspection” for checking the function of the self-checking circuitry. The output contact relays
of the temperature switch are of the normally close type and will therefore signal alarm condition in the
event of a mains failure. The temperature switch can signal the following three operating conditions:
n
Normal operation (temperature within permissible range)
n
Alarm (limit temperature exceeded)
n
Alarm (fault in temperature switch or resistance thermometer)
A green LED indicates Power ON. Two red LEDs are illuminated if the temperature limit is exceeded or if
there is a system malfunction. The failure of one channel (loss of redundancy) is signalled by the light-
ing-up of one red LED. The combination of TRG 5-... and TRS 5-6 provides fail-safe protection against a
first fault, i.e. the system will still continue to provide the safety function even after the occurrence of a
first fault.
Design
TRS 5-6
Plug-in unit in plastic case for installation in contol cabinets. The terminals in the case are accessible
after loosening two screws and unplugging the unit from its base. Thanks to the code plug the equip-
ment cannot be connected inadvertently to wrong GESTRA equipment. The equipment may be clipped
onto a 35 mm supporting rail or screwed into position on a mounting panel.
Scope of supply
TRS 5-6
Temperature switch TRS 5-6
Installation manual
