Siemens TC12 Installation, Commissioning And Maintenance Handbook page 92

A Voltage monitoring transformer (part number 667/7/25172/000) is used per
Outstation when equipped with LMU facilities. The red and black wires connect to
the lamp supply mains live and neutral being monitored (Red to Live and Black to
Neutral). The orange and white output wires connect to PL1. Referring to Figure
35 the orange wire connects to pin 49 (ZXO Input +) and the white wire connects
to pin 50 (ZXO Input -. LMU Input 24, pins 47 and 48, is internally connected to the
ZXO input, pins 49 and 50, see note earlier in this section).
The sensor should then be anchored to a suitable point in the cabinet (using the
grooves on the sensor as a guide).
A facility to monitor two controllers operating from a common mains supply is
provided (e.g. for use with some dual pelican controllers). The voltage monitoring
and current sense transformers for the first controller are connected as described
above. When all these have been allocated the next available input is used for the
second controller voltage monitor transformer. This input will be configured as the
second supply voltage monitoring input (see handset commands). The current
sense transformers for the second controller are then connected consecutively to
the remaining input numbers.
Note: The above arrangement does not provide independent monitoring of each
controller. Switching the lamps off on the first controller will stop all
monitoring. If this is not acceptable an alternative configuration is
available:
Connect an unswitched mains supply to the first voltage monitoring
transformer (output to PL1 pins 49 and 50).
Connect the first controller lamp supply monitor to Pl1 input 1, and
configure this input as not monitored.
Proceed as described above - starting controller 1 current inputs at PL1
input 2.
With the exception of the regulatory signs, each controller output that is to be
monitored requires a means of determining the state of the green lamp drive
voltage for that output. For single aspect outputs (e.g. switched signs) the state of
the drive to the monitored aspect is required. In the case of Red lamp monitoring
there is an additional requirement for a red lamp mains state indication.
For normal lamp monitoring (NOT RED LAMP MONITORING) there are two
possible methods of obtaining the mains state inputs.
a) Using suitably configured green confirm outputs from the controller. The output
is connected to the appropriate input on PL2.
Note: It may not be possible to use stage confirm bits if the following situations
exist:
666/HE/43100/000
TC12 Installation, Commissioning & Maintenance Handbook
Voltage Monitoring Transformer
Monitoring Dual Controllers
Voltage Sensors
Phase overlaps from one stage to another.
Staggered phase introduction due to phase delays or intergreens.
Page 82 Issue 10