Operating instructions

Technical Data Vector Control Chassis Type Frequency Converter
476 869 4070 76 J AB-74 Siemens AG
4-16 Operating Instructions SIMOVERT MASTERDRIVES
1) The working pressure depends on the flow conditions of the cooling-
water network in the infeed and return and must be determined during
start-up.
The necessary cooling-water quantity/time unit has to be set, e.g. via
valves with a flow rate indicator
(e.g. by Messrs. "OSTACO Armaturen AG”, CH-8902 Urdorf,
Tel.++4117355555).
Measures have to be envisaged by the user to maintain the max.
permissible operating pressure. The use of a pressure controller is
necessary. For closed cooling systems, pressure compensating
devices with safety valves (< 1.5 bar) and venting devices have to be
provided.
The cooling system has to be vented when it is filled. A vent cock is
installed on the water heat sinks of chassis 2 units for this purpose (see
below).
Cooling-water installations in a mixed system with copper or copper
connections should be avoided and are only possible under special
measures, e.g. closed cooling water circuit, full filter system (i.e. Cu
ions are filtered out), water additives (e.g. products of Messrs. “Schilling
Chemie GmbH” PF 1136, D-71687 Freiberg, Tel. [phone]).
Application suggestions for various system configurations are contained
in the A&D DS Information E20125-C6038-J702-A1-7400 dated
February 1997.
The utmost care must be taken when laying the water pipes. The pipes
must be securely restrained and checked for leakages.
Special measures are necessary to protect against moisture
condensation. This is particularly necessary if the entry temperature of
the cooling water is considerably lower than the ambient temperature of
the air.
For this purpose, a suitable valve device has to be provided in the
infeed, e.g. temperature-controlled valve device using the "bypass
method" called "Amot valve” (source: Eng. consultants: Neundörfer
Fichtenstr.5, 91094 Langensendelbach, Tel.: [phone]).