Pentax DM Mode D'emploi page 8

Fixed installation with coupling foot -Fig.3-:
For motor-driven pumps that have this option, proceed as follows:
• secure the coupling foot to the bottom of the tank by means of expansion bolts;
• install the delivery pipe with its check valve and lock gate: to conduct maintenance and cleaning
operations on the valve, we recommend installing the lock gate and check valve in horizontal sections
with easy access, with the lock gate downstream of the check valve;
• engage the two guide tubes on the coupling foot, fastening them to the top using the pipe guide
bracket and their rubber dampers and threaded washers (to ensure the two guide tubes are parallel);
• fix the coupling slide to the pump and with a chain or a rope (made with non-perishable materials)
attached to the eyebolt on the cover of the motor, lower the pump down: thanks to the two tube guides,
it will fit perfectly into the foot.
This is the most convenient solution for fixed installations because it allows you to easily and quickly extract and the
subsequently reposition the motor-driven pump in the tank, allowing you to conduct perform maintenance and cleaning
of the pump without having to empty the collection tank or remove any bolt.
Portable installation -Fig.4-:
Always fix a rope or a safety chain made with non-perishable material to the eyebolt or the pump's handle. If using a
delivery pipe made with plastic or in general with flexible materials, always use the safety rope to raise, lower, move and
anchor the pump. Never use the electric power cord and/or float to support the pump. Always remember to secure the
safety rope used to lower the pump at the top, on the edge of the pit or the trap door. Secure the electric power cord to
the safety rope or to the delivery pipe with the designated straps: if the delivery pipe is a flexible tube, leave the cable
loosened to avoid tension caused by expansion of the pipe under load. It is always preferable, even for portable instal-
lations, that during operation the pump is not suspended but is leaning against a solid base.
Electrical connection - Page 67 -
The electrical connection should always be conducted by qualified personnel, in compliance with local regulations. Make
sure the voltage and frequency of the mains power supply match those reported on the plate of the motor-driven pump.
Make sure that the mains power supply has an efficient grounding connection and conducting the grounding of the
motor-driven pump. The power cord and/or cable of the float, if any, must never be stressed, stretched or bent with
sharp bends. During installation, make sure that the free end of the power cord is never immersed in water and is well
protected against possible infiltrations of water or moisture. Special attention should be given to the integrity of the
cables: even small leaks can cause infiltration in the electric motor. In case of damage to the cables it is best to replace
them rather than repair them: in any case always contact qualified personnel. If using an extension, the junction must
remain dry and the cable must be sized appropriately.
The electric motor of single-phase motor-driven pumps (DP / DX / DG / DH) is protected by a thermal breaking device
with automatic closing inserted into the winding: before conducting any maintenance and/or repair on the motor-driven
pump disconnect it from the mains power supply as if the motor is on standby following intervention of the thermal device
or due to incorrect positioning (jamming) of the float, it may suddenly restart. In case of excessive overheating of the
motor, the thermal device can stop the machine: the cooling time is about 15 minutes, after which the pump turns on
again automatically. You must always try to eliminate the cause that triggered the intervention of the thermal protector
(impeller blocked due to for foreign objects sin the pump, coolant temperature too high). To operate single-phase motor-
driven pumps (DV / DM / DC / DTR) need a condenser with the features below:
• C= 35 μF / 450 V for DV150/DM160/DTR150/DC160 • C= 50 μF / 450 V for DV200/DM210/DTR200/DC210.
For single-phase motor-driven pumps with suction grinding systems, DTR150 and DTR200 models, is also recommended
to use starter capacitor with circuit breaker with the following features: C= 85 μF / 480 V, start-up time/re-start time: 1,5"
/ 6". This capacitor, connected in parallel to the run capacitor, is designed to increase the starting torque only at start-up.
The electrical connection of the capacitor(s) must be performed by qualified personnel, in compliance with local laws and
regulations according to the diagram on the sticker placed on the power supply cord. For all motor-driven pumps, both
single and three-phase pumps, it is always necessary to install an adequate electrical protection (adequately set circuit
breaker and differential switch with an operating current of less than 30 mA) that can provide an all-pole disconnection
from the mains with an opening distance between the contacts of at least 3 mm.
The maximum admitted shift between the actual voltage of the power supply and the rated value indicated on the plate
of the motor-driven pump is of ±6% for single-phase machines and ±10% for three-phase ones.
Before conducting any maintenance and/or repair disconnect the machine from the power supply.
Start-up -Fig.5-
Before installing the pump, make sure that the machine is not connected to the mains supply and that the rotor turns
freely: to so this, act on the impeller (or, in the case of DTR motor-driven pumps, on the rotating part of the grinding
system) through the suction outlet. For three-phase motor-driven pumps make sure the rotation direction is correct,
i.e. clockwise looking from above of the machine (see the arrow next to the delivery outlet on the motor-driven pump).
To do this, before installation, interrupt the motor-driven pump and start the motor for a few seconds (connection and
disconnection): if the rotation is correct, the pump rebounds in an anticlockwise direction. When performing this test,
make sure that the machine is at a safe distance from people, animals or property. To change the direction of rotation,
switch the two phases of the supply line. There is no need to check the direction of rotation for single-phase motor-driven
pumps. DO NOT operate the machine in dry conditions. Start-up with float: the float switch connected directly to the
motor-driven pump starts and stops the pump itself. If necessary, adjust the cable length of the float, making sure that
an excessive length does not cause the engine to overheat or run in dry conditions. Make sure the float switch can move
freely providing for pits of an adequate size. The size of the pit must always be considered also in relation to the amount
of incoming water and the capacity of the pump, in order not to subject the electric motor to an excessive number of
starts. Check that the motor-driven from operates within a rated performance shown on the plagues; otherwise adjust
as necessary the lock gates located on the delivery pipe. Start-up without float: start the pump only when immersed in
the liquid to pump out; heck the minimum suction depth on the machine installed. NOTE In both start-up methods, with
or without float, for continuous operation of the motor-driven pump the electric motor must be completely immersed in
the liquid to be pumped.