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ES030-10
Safety Instructions
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.
Installation Category
The Delta Elektronika power supplies have been evaluated to installation category II (Over voltage category II).
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.
Grounding of Power Output
If the output of a unit is specified to deliver max 60Vdc, and either the negative or positive power output is
grounded, the voltage on the following connections can be considered safe:
- power outputs and sense connections
- programming/monitor/status-signals, Interlock, Master/Slave-connections, ACF/DCF-relay
- all Delta Elektronika interfaces
Warn ing:
When the pos i tive power out put can ex ceed 60Vdc in re spect to the neg a tive out put,
ad di tional ex ter nal mea sures must be taken to en sure safety iso la tion of the fol low ing:
- power out puts and sense con nec tions.
Warn ing:
When the neg a tive power out put of the unit can ex ceed 60Vdc / 42.4Vpk in re spect to ground,
ad di tional ex ter nal mea sures must be taken to en sure safety iso la tion of the fol low ing:
- power out puts and sense con nec tions
- pro gram ming/mon i tor/sta tus-sig nals, In ter lock, Mas ter/Slave-con nec tions, ACF/DCF-re lay
- in ter faces with op er a tional iso la tion
- non-iso lated in ter faces.
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 60V, 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.
Caution 3: When programming a high voltage unit directly via a PC or via a network connection, either ground
the negative power output or use a safety isolated interface!
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.
Rev. Sept. 2012
SAFETY INSTRUCTIONS
DELTA ELEKTRONIKA BV
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