Installation
41GA02411_002_C0 - 10/2016 - © Leybold
3.4 Electrical Connection
Please note safety information 0.2. and 0.7.10 and 0.7.11
The pump has no switching devices of its own. All protection measures in
connection with the power supply need to be implemented from the side of
the plant in the full responsibility of the customer.
After a mains power failure the pump will restart automatically once the
power returns.
If for this reason there results in connection with the application a danger
potential it needs to be ensured that a restart can only be performed after a
manual reset. This applies equally emergency shutdowns.
3.4.1 Motor Protection
The electric motor must be protected with a thermal overload protection of
class 20 (in accordance with a IEC 60947-4). Motor protection switches
which belong to class 20 respond with a delay, after 20 seconds at the lat-
est.
The setting for the motor protection switch which corresponds to the local
requirements can be taken from the following U/I diagram (diagram 1) for ∆-
connection (applies analogously also for ∆∆- connection).
When connecting the pump in a ∆∆-circuit at U/2 the values read off from
the diagram (∆-circuit) for 2 x U/2 need to be doubled.
If briefly an unacceptably high temperature should occur in the motor coils,
then this condition is detected by the integrated PTC resistor. The PTC resis-
tor is connected to the terminals 10 and 11 in the junction box (see fig. 3.1
and 3.2). Connect these terminals exclusively via a corresponding actuator
(for example Eaton Möller EMT6DBK) with electrical isolation to the pump’s
control system, because the sensor in the motor is not reliably isolated from
the mains power side.
The insulation of the sensor cable must not exhibit a higher value but should
exhibit a minimum basic insulation.
The PTC resistor provides a means of protection which in the case of insuffi-
cient cooling, a temporary failure of a mains phase or in the case of frequen-
cy variations will offer effective protection and will prevent costly damage to
the motor coils.
The number of operating hours of the pump is acquired through the
SP-Guard.
The local connection conditions will possibly necessitate means for the pur-
pose of reducing the surge currents upon switching the pump on.
WARNING
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