Transport And Temporary Storage; Description; Motors; Pumps - Zehnder Pumpen ZPG 71 Betriebsanleitung

Transport and temporary storage

3.
On principle, the pumps ZPG 71 should be lifted and/or transported using the eyelets on top or the handlebar de-
signed for that purpose. Under no circumstances is the pump to be lifted on the power supply cable.
For temporary storage and conservation, it suffices if the pumps are stored in a cool, dry, frost-protected and dark
place. In case of longer storage periods, please spin the impeller of the pump at least once per month to avoid the
jamming of the mechanical seals.

4. Description

4.1 Motors

The pumps ZPG 71 are equipped with an AC asynchronous induction motor or a three-phase asynchronous motor.
In each of the 3 motor windings two temperature sensors (bi-metal) are integrated which work as temperature regu-
lator respectively temperature limiters (opener). If the motor overheats for any reason, the bimetallic contacts re-
spond to this and the motor is switched off. The motor switches on automatically as soon as it is cooled down. If the
motor heats over the starting temperature of the temperature regulator then the temperature limiter switches on.
Then the motor must be started solely manually. However, the motor may only be restarted after an error anal-
ysis has been conducted and the cause of malfunction has been eliminated.

4.2 Pumps

The pump housing and the impeller are made of grey cast iron. The pumps are equipped with a flange DN 50.
4.3 Switching device
The pumps are delivered without switching device.

5. Installation

- Disconnect the power supply before carrying out any kind of work on the plant!
- The electrical connections are not to be exposed to humidity!

5.1 Electrical equipment

The AC-powered model of the pump can be operated with an auxiliary switch device which is equipped with the
following elements:
main switch, fuses, contactors, thermal motor protection relay, operating capacitor, restart lockout for the clipping
circuit, signal lamps „Betrieb" (operation) and „Störung" (malfunction), Ex i - relay and a floater for the protection
against dry running.
The pump is connected to an earthed wall socket with an earthed type plug by means of the cable which is con-
nected to the switching device.
- The switching device has to be installed outside the flood-endangered area!
- The floater for the protection against dry running has to be installed in such a way, so that a decline of
the water level below the bottom line of the motor housing is not possible.
Further electrical installation is not necessary. If required, the motor housing can additionally be earthed by means
of the external earthing terminal intended for that.
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