Zenit GRS Series, Use And Maintenance Instructions

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to earth and supply power to the leads attached to the motor pump. For single phase model GRS – GRI – GRE
motor pumps, connect the yellow-green lead to earth and supply the leads exiring from the capacitor/circuit breaker
box. For single phase model GRS – GRI – GRE motor pumps, if the leads from the capacitor/circuit breaker box
should be disconnected, reconnect the motor pump output leads as follows: BLACK lead to a line connector; blue
lead to the other line connector or to a capacitor connector;BROWN lead to the other capacitor connector.
SINGLE-PHASE electrical connection fig.3-4-5
8.2 THREE PHASE ELECTRICAL CONNECTION
Connect the yellow-green lead to earth and supply the motor pump output leads. If the motor pump has 3 leads
they must be connected to a three phase line with voltage and frequency equal to that indicated on the data plate,
or to a control panel with devices to reduce the initial current. If the motor pump has 6 leads they must be
connected to a control panel with a Y/delta switching device. If the connection is made directly to the delta the
supply voltage is the lower of those indicated on the data plate; if the connection is made to the Y the voltage is the
higher of those indicated. The supply leads are marked as follows:
- 3 leads U – V – W;
- 6 leads U1 – U2 – V1 – V2 – W1 – W2;
THREE-PHASE electrical connection fig. 6-7
8.3 THERMAL PROBES
Thermal protection is incorporated in the motors and resets automatically in the single phase versions and in the
three phase versions equipped with thermistors or remote control switches. In the three phase versions without
remote control switches the thermal protection, where present, is connected to the motor pump outlet leads labelled
T. The thermal protection must be connected to the corresponding terminal on the control panel.
8.4 CONDUCTIVITY PROBES
Where present the conductivity probe is inserted in the oil chamber and connected to the motor pump output lead
labelled S. The probe must be connected to the corresponding terminal on the control panel.