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178

Digitax ST User Guide

Issue Number: 5

13.1.10 Input inductor calculation

To calculate the inductance required (at

%), use the following equation:

Where:

= drive rated input current (A)

= inductance (H)

= supply frequency (Hz)

= voltage between lines

13.1.11 Motor requirements

No. of phases: 3
Maximum voltage:

Digitax ST (200 V): 240 V
Digitax ST (400 V): 480 V

13.1.12 Temperature, humidity and cooling method

Ambient temperature operating range:

0 °C to 50 °C (32 °F to 122 °F).
Output current derating must be applied at ambient temperatures
>40 °C (104 °F).

Minimum temperature at power-up:

-15 °C (5 °F), the supply must be cycled when the drive has warmed
up to 0 °C (32 °F).

Cooling method: Forced convection
Maximum humidity: 95 % non-condensing at 40 °C (104 °F)

13.1.13 Storage

-40 °C (-40 °F) to +50 °C (122 °F) for long term storage, or to +70 °C
(158 °F) for short term storage.

Storage time is 2 years.
Electrolytic capacitors in any electronic product have a storage period
after which they require reforming or replacing.
The DC bus capacitors have a storage period of 10 years.
The low voltage capacitors on the control supplies typically have a
storage period of 2 years and are thus the limiting factor.
Low voltage capacitors cannot be reformed due to their location in the
circuit and thus may require replacing if the drive is stored for a period of
2 years or greater without power being applied.
It is therefore recommended that drives are powered up for a minimum
of 1 hour after every 2 years of storage.
This process allows the drive to be stored for a further 2 years.

13.1.14 Altitude

Altitude range: 0 to 3,000 m (9,900 ft), subject to the following
conditions:

1,000 m to 3,000 m (3,300 ft to 9,900 ft) above sea level: de-rate the
maximum output current from the specified figure by 1 % per 100 m
(330 ft) above 1,000 m (3,300 ft)

For example at 3,000 m (9,900ft) the output current of the drive would
have to be de-rated by 20 %.

13.1.15 IP / UL Rating

The drive is rated to IP20 pollution degree 2 (dry, non-conductive
contamination only) (NEMA 1).
The IP rating of a product is a measure of protection against ingress and
contact to foreign bodies and water. It is stated as IP XX, where the two digits
(XX) indicate the degree of protection provided as shown in Table 13-15.

Table 13-15 IP Rating degrees of protection

Table 13-16 UL enclosure ratings

13.1.16 Corrosive gasses

Concentrations of corrosive gases must not exceed the levels given in:
•

Table A2 of EN 50178:1998

•

Class 3C2 of IEC 60721-3-3

This corresponds to the levels typical of urban areas with industrial
activities and/or heavy traffic, but not in the immediate neighborhood of
industrial sources with chemical emissions.

13.1.17 RoHS compliance

The drive meets EU directive 2002-95-EC for RoHS compliance.

13.1.18 Vibration

Maximum recommended continuous vibration level 0.14 g r.m.s. broad-
band 5 to 200 Hz.

This is the limit for broad-band (random) vibration. Narrow-band
vibration at this level which coincides with a structural resonance could
result in premature failure.

Bump Test

Testing in each of three mutually perpendicular axes in turn.
Referenced standard:IEC 60068-2-29: Test Eb:
Severity: 18 g, 6 ms, half sine

No. of Bumps: 600 (100 in each direction of each axis)

Random Vibration Test

Testing in each of three mutually perpendicular axes in turn.
Referenced standard:IEC 60068-2-64: Test Fh:
Severity: 1.0 m²/s³ (0.01 g²/Hz) ASD from 5 to 20 Hz

-3 dB/octave from 20 to 200 Hz

Duration: 30 minutes in each of 3 mutually perpendicular axes.

100

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First digit

Second digit

Protection against contact and
ingress of foreign bodies

Protection against ingress of water

0 No protection

Protection against large
foreign bodies