Mosa RENTAL GE 50 KR-5, Use And Maintenance Manual

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4. Description
26
4.2 Electrical protection
4.2.1 Main machine switch
The generating set is protected against short circuits and
overloads by a circuit breaker (1) located upstream of the
system.
Overload protection tripping is not instantaneous; it follows
an overcurrent/time characteristic. The greater the overcur-
rent, the shorter the tripping time.
The rated tripping current refers to an operating temperature
of 30°C. Each variation of 10°C corresponds approximately
to a variation of 5% on the rated current value.
4.2.2 Hearth leakage relay (model
Type A - EU version)
*
Important
•
Differential relay calibration changes must only be performed by qualified personnel.
If necessary, contact Technical Support.
The hearth leakage relay allows you to choose the value of the tripping current in order to keep the values of
the contact voltages below the limits set by electrical safety regulations.
These adjustments allow to operate a selective intervention based on the current, and (above all) time.
The relay is the ideal solution to be combined with the main switch of the panel when downstream there are
several differential circuit breakers to protect the different output sockets.
1 - Ground fault current adjustment potentiometer
2 - Intervention time adjustment potentiometer
3 - Multifunction led for internal electronics fault report/in-
ternal temperature out of range / potentiometer t(SES)
not centred correctly
4 - Power supply presence signal led
5 - Differential relay tripped signal led
6 - Tool set-up microswitches
7 - Test button
8 - Manual reset button
1
D5260360
1 2
5
7
8
6
3
4
D5260380
DER3/ 0D model factory settings
• Microswitches
•
Output relay: N.De (Normally de-energized)
•
Fault current adjustment: IΔ : x 0.1
•
Intervention time adjustment: t : x 1
•
Reset: Man. (manual)
• Potentiometers
IΔ (A) : 0.3 ÷ 0.5 (30mA ÷ 50mA)
T(sec) : INST (Instant)