Oerlikon Leybold Vacuum Sogevac SV630 B Operating Instructions Manual page 26

Installation
Warning
Note
Caution
26 GA02319_002_03 - 07/2007 - © Oerlikon Leybold Vacuum
If any security switch or electrical defect cuts out the pump, re-start-up of the
pump has to be possible only manually.
Motor protection device
To protect the motor windings against a variety of operational malfunctions,
the motor of the SV630 BF is fitted with protection devices.
CTP thermistors to IEC 60034-1 and DIN 44081/440823 are temperature -
dependent, semi-conductor devices embedded in the motor windings.
Working principle
Non-linear variable resistors. It is recommended to conect them to the control
circuit. CTP thermistors ensure a good protection against the overheating of
the motor.
The pump is designed for direct starting even under load conditions, i.e. the
pump can be switched on against vacuum in the intake port.
After connecting the motor and after every time you alter the wiring, check
the direction of rotation. Refer to the marking on the motor. During the check,
the intake port should be open. If the direction of rotation is wrong, oil may
be ejected out the intake port. (The vacuum system may be pressurised).
For the check, switch on the motor briefly. If it starts up with the wrong
direction of rotation, switch it off immediately and interchange two phases of
the connection. It is recommendable to check the direction of rotation with a
phasesequence indicator.
Prolonged running of the motor in the wrong direction of rotation will
damage the pump !
Oil thermal Switch
Connection has to be made in the junction box (see fig. 7).
Breaking power on resistive circuit 250 VAC / 10 A.
To be serial wired with the coil of motor's contactor. Use an auxiliairy relay.
The pump is switched off once a certain oil temperature (115 °C/239 °F) is
exceeded. It is also possible to connect an alarm system. (see fig. 7).