because timing is everything
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General Installation Guideline
Identification
Each ITR unit is shipped with an identification label on its side. This label provides details of
the ITR product code, the power supply requirement and serial number.
Check the identification label on the side of the unit to ensure that the correct model
has been supplied before proceeding to install!
Location
INSTALLATION ENCLOSURE
The ITR should be installed on a DIN rail in an enclosure which acts as a Fire
Enclosure and an Electrical Enclosure.
RESTRICTED ACCESS LOCATION
The ITR should be installed in a Restricted Access location, accessible only using a
lock and key or other means of security.
INSTALLATION PRACTICE
The ITR should be installed by suitably qualified personnel.
Wiring, cable entries, conduit entries, knock-outs or glands should be installed in
accordance with local wiring regulations.
Power Supply
The input voltage range is marked on the product label on the side of the ITR. Do
not apply voltage outside this range. Note that either supply polarity is
acceptable due to internal rectification.
OVERCURRENT PROTECTION
–
HV MOSFET
Circuit from an external supply to HV MOSFET connections on the ITR shall be
protected with 300 Vdc fuse rated at
≤ 1A
.
OVERCURRENT PROTECTION - POWER
For the power supply protection fuse: -
•
Use a slow blow fuse
•
Calculated fuse current rating using formula: -
Fuse
current rating =
𝐓𝐡𝐞 𝐥𝐞𝐬𝐬𝐞𝐫 𝐨𝐟 𝟏𝐀 𝐨𝐫
𝟏𝟎
𝑺𝒖𝒑𝒑𝒍𝒚 𝑽𝒐𝒍𝒕𝒂𝒈𝒆
Amps
Fuse
voltage rating = At least the maximum supply voltage
For example, if using a 300V power supply,
10
300
= 33mA so you would use
a 40mA (or above) slow blow fuse rated at or above 300V dc.