Avoidance Of Frost And Corrosion Damage In The Cooling System; Avoidance Of Damage To Roller Bearings During Stoppages; Measurement Of The Insulation Resistance After An Extended Stoppage - Siemens SIMOTICS DC 1HS7 Operating Instructions Manual

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8.5.2

Avoidance of frost and corrosion damage in the cooling system

● For avoidance of frost and corrosion damage, completely drain the water from the cooling

8.5.3

Extended stoppages at the identical or almost identical resting position of the roller bearings

can lead to damage such as brinelling or formation of corrosion.

● During stoppages, regularly start the machine up for a brief period once a month, or at least

● During re-commissioning, refer to the information in the "Commissioning" section.

Measuring the insulation resistance and polarization index (PI) provides information on the

condition of the machine. It is therefore important to check the insulation resistance and the

polarization index at the following times:

● Before starting up a machine for the first time

● After an extended period in storage or downtime

● Within the scope of maintenance work

SIMOTICS DC 1HS7

Operating Instructions 02/2016

system. Then blow air through the cooling system to dry it.

If the cooling system cannot be drained because standby capability is required at short

notice, protect the cooling circuit against frost and corrosion damage. To do this, add

suitable additives to the cooling water.

NOTICE

Impairment of the heat transport

Additives such as anti-freeze and corrosive inhibitor can impair the heat transport.

Operate the motor only with the contractually agreed water quality.

For avoidance of deposits, the cooling water circuit must then be kept running. So as to be

certain of excluding the possibility of formation of condensation within the machine, the anti-

condensation heating should also remain switched on (if fitted).

turn the rotor over several times.

If you have uncoupled the machine from the driven machine and secured the rotor with a

rotor shipping brace, then remove this before turning the rotor over or starting the machine

up.

Make sure that the resting position of the roller bearings after the rotor has been turned

over is different from what it previously had been. Use the fitted key or the coupling halves

as reference markers.

Operation

8.5 Stoppages

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