Armstrong 4300 - 5.1 Earth Leakage Current; 5.4 Supply Voltage and Motor Protection

installation &
operating instructions
Design Envelope 4300 and 4380 vertical in-line
pumping unit with integrated controls
14
caution
High voltage testing (Megging) of the motor / inverter
may cause damage to the electronic components and
therefore should not be carried out.
5.1 earth leakage current
Earth leakage current is primarily caused by the ca-
pacitance between motor phases and the motor frame.
The rfi filter contributes additional leakage current, as
the filter circuit is connected to earth through capacitors.
The size of the leakage current to the ground depends of the
following factors, in order of priority:
1 Switching frequency
2 Motor grounded on site or not
The leakage current is of importance to safety during handling /
operation of the Design Envelope pump if (by mistake) the
on-board inverter has not been earthed.
attention:
Since the leakage current is >3.5 mA (approx 4 -20 mA),
reinforced earthing must be established which is required if en
50178 is to be complied with. Never use elcb relays that are not
suitable for dc fault currents (type a).
If elcb relays are used, they must be:
•
Suitable for protecting equipment with a direct current
content (dc) in the fault current (three-phase bridge rectifier)
•Suitableforpower-upwithshortchargingcurrenttoearth
•Suitableforahighleakagecurrent
5.2 earth leakage current
The number of starts / stops via the mains voltage must not
exceed one time per two mins.
If a higher number of starts / stops is required then the start/
stop digital input must be used (mains voltage directly
connected). This is the preferred method of starting and
stopping Design Envelope Pumps.
The three phase mains must be isolated before
performing maintenance of the pump.
5.3 additional motor protection
With the exception of supply fuses / mcb’s to protect the
installation, no additional overload or over-temperature
protection is required. Motor / inverter protection includes:
•Mainsphaseloss
•Overvoltage
•Undervoltage
•Overcurrent
•Shortcircuit
•Overtemperature
5.4 supply voltage
The supply voltage details can be found on the motor
nameplate. Please ensure that the motor is suitable for the
electrical supply on which it is to be used. The mains supply
for Design Envelope pumps is as follows:
3 × 380/400/415/440/460/480v ±10% Supply
frequency - 50/60hz
5.5 tools for installation
One cross point screwdriver, one Large screwdriver,
one Small screwdriver
5.6 cable entry sizes
0.55kW - 4.0kW: 3 × m20 × 1.5
5.5kW - 7.5kW: 1 × m25 × 1.5, 2 × m20 × 1.5
One cable entry is factory fitted with a plug kit for external
keypad connection.
5.7 max. cable cross section
Mains cable supply: 4.0mm
2
Control cable: 1.5mm
2
Serial communication cable: 1.5mm
2