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SM3300 INTERFACES DELTA ELEKTRONIKA BV
March 2014 SAFETY INSTRUCTIONS Page 2 - 1
2 SAFETY INSTRUCTIONS SM3300 Interfaces
1 Caution
The following safety precautions must be observed during all phases of operation, service and repair of this equipment.
Failure to comply with the safety precautions or warnings in this document violates safety standards of design, manufacture
and intended use of this equipment and may impair the built-in protections within. Delta Elektronika shall not be liable for
user’s failure to comply with these requirements.
2 Installation Category
The Delta Elektronika power supplies have been evaluated to installation category II (Over voltage category II).
3 Grounding of Mains Input
This product is a safety Class 1 instrument. To minimize shock hazard, the instrument chassis must be connected to the AC
Power Supply mains through a three or four conductor power cable for resp. a single or three phase unit, with the ground
wire firmly connected to an electrical ground (safety ground) at the power outlet.
For instruments designed to be hard-wired to supply mains, the protective earth terminal must be connected to the safety
electrical ground before another connection is made. Any interruption of the protective ground conductor, or disconnection of
the protective earth terminal will cause a potential shock hazard that might cause personal injury.
4 Grounding of Power Output
If the output of a unit is specified to deliver maximum 60VDC, and either the negative or positive power output is grounded,
the voltage on the power outputs and sense connections can be considered safe.
Caution 1: If a low voltage unit has both power outputs floating, or if the output is in series with an external high AC or DC
voltage, the negative power output can exceed the safe value in respect to ground as specified in the above warning!
Caution 2 : Although a high voltage unit is set to a safe voltage below 60VDC, for safety it must always be considered as high
voltage unit! Wrong operation, a programming error or an external defect can result in an unsafe high output voltage.
For more information and schematics regards Grounding and Safety, see the special application note "Safe operation of a
power supply" on the Delta Elektronika website.
5 Fuses
Fuses must be changed by authorized Delta Elektronika service personnel only, for continued protection against risk of fire.
6 Input Ratings
Do not use an AC Supply which exceeds the input voltage and frequency rating of this instrument. The input voltage and
frequency rating of the Delta Elektronika power supply series are stated in de accompanying datasheet.
7 Live Circuits
Operating personnel must not remove the instrument cover. No internal adjustment or component replacement is allowed by
non Delta Elektronika qualified personnel. Never replace components with the power cable connected. To avoid injuries,
always disconnect power, discharge circuits and remove external voltage sources before touching components.
8 Parts Substitutions & Modifications
Parts substitutions and modifications are allowed by authorized Delta Elektronika service personnel only. For repairs or
modifications the unit must be returned to a Delta Elektronika service facility.
Warning:
When the positive power output can exceed 60VDC in respect to the negative output, additional external
measures must be taken to ensure safety isolation of the power outputs and sense connections.
Warning:
When the negative power output of the unit can exceed 60VDC / 42.4Vpk in respect to ground, additional
external measures must be taken to ensure safety isolation of the power outputs and sense connections.
The standard LAN and Interlock connectors and optional interfaces are at ground level and can be considered
safe if the negative power output of the unit does not exceed 1000VDC / 707Vpk in respect to ground.