5
WARNING
Motor Size
0.37kW
Type
Start Capacitor
Run Capacitor
0.75kW
1.1kW
1.5kW
2.2kW
PSC
PSC
PSC
CS/CR
CS/CR
-
-
-
200-250
200-250
16
25
35
40
60
ii)
Single Phase Motors
Conventionally this is provided by a relay connected by cable to sensors in the
borehole water, though wireless electronic protection is also available.
Ÿ
DS/DSP/D3SP motors can be used with inverters for power by DC sources,
particularly solar modules and also variable speed operation. Further
information can be obtained from the pump supplier if there is a particular
installation requirement.
All single phase motors are supplied with control units including capacitors and a
switch. PSC motors are fitted with one combined start/run capacitor while CS/CR
motors are fitted with separate start and run capacitors with a change-over relay.
Specifications are as follows:-
Correct connection of terminals and identification of the start,
run and common windings is essential or else the motor will
burn out. Extra care must therefore be taken when connecting
and if in doubt the pump supplier should be consulted.
Small single phase motors (up to 1.1kW) are fitted with inbuilt thermal overload
protection though for added motor security it is advisable to fit a voltage protection
unit such as a Dayliff AVS. For motors larger than 1.1kW a DOL starter is required
and this can be provided by a separate DOL contactor and overload unit or
alternatively by a DAYLIFF Drytek controller which includes over/under current
protection plus multi-function power input protection and wireless low level
protection by cosØ monitoring. Digital indications of operating parameters are
also provided including current, voltage and cosØ. For full motor protection a
Drytek controller is recommended.
iii) Three Phase Motors
All three phase motors require DOL starting and overload protection. Drytek
controllers as detailed for single phase motors are recommended for enhanced
protection and prolonged life.