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Temperature ranges

For the unit in its packaging, the storage

temperature range is –30 °C to 80 °C

(HR 1120: –30 °C to 70 °C). The operating

temperature range indicates the

temperatures that the encoder may reach

during operation in the actual installation

environment. The function of the encoder

is guaranteed within this range

(DIN 32 878). The operating temperature is

measured on the face of the encoder

ﬂ ange (see dimension drawing) and must

not be confused with the ambient

temperature.

The temperature of the encoder is

inﬂ uenced by:

• Mounting conditions

• The ambient temperature

• Self-heating of the encoder

The self-heating of an encoder depends

both on its design characteristics (stator

coupling/solid shaft, shaft sealing ring, etc.)

and on the operating parameters (rotational

speed, power supply). Temporarily in-

creased self-heating can also occur after

very long breaks in operation (of several

months). Please take a two-minute run-in

period at low speeds into account. Higher

heat generation in the encoder means that

a lower ambient temperature is required to

keep the encoder within its permissible op-

erating temperature range.

These tables show the approximate values

of self-heating to be expected in the en-

coders. In the worst case, a combination of

operating parameters can exacerbate self-

heating, for example a 30 V power supply

and maximum rotational speed. Therefore,

the actual operating temperature should be

measured directly at the encoder if the en-

coder is operated near the limits of permis-

sible parameters. Then suitable measures

should be taken (fan, heat sinks, etc.) to re-

duce the ambient temperature far enough

so that the maximum permissible operat-

ing temperature will not be exceeded dur-

ing continuous operation.

For high speeds at maximum permissible

ambient temperature, special versions are

available on request with reduced degree

of protection (without shaft seal and its

concomitant frictional heat).

Self-heating at

supply voltage

(approx.)

15 V 30 V

ERN/ROD

+ 5 K + 10 K

ECN/EQN/ROC/

ROQ/RIC/RIQ

+ 5 K + 10 K

Heat generation at

speed n

max

Solid shaft

ROC/ROQ/ROD/

RIC/RIQ

Approx. + 5 K

with IP 64

protection

Approx. + 10 K

with IP 66

protection

Blind hollow shaft

ECN/EQN/

ERN 400

Approx. + 30 K

with IP 64

protection

Approx. + 40 K

with IP 66

protection

ECN/EQN/

ERN 1000

Approx. + 10 K

Hollow through

shaft

ECN/ERN 100

ECN/EQN/ERN

400

Approx. + 40 K

with IP 64

protection

Approx. + 50 K

with IP 66

protection

An encoder’s typical self-heating values depend

on its design characteristics at maximum

permissible speed. The correlation between

rotational speed and heat generation is nearly

linear.

Measuring the actual operating temperature at

the deﬁ ned measuring point of the rotary

encoder (see Speciﬁ cations)

System tests

Encoders from HEIDENHAIN are usually

integrated as components in larger

systems. Such applications require

comprehensive tests of the entire

system regardless of the speciﬁ cations

of the encoder.

The speciﬁ cations shown in this

brochure apply to the speciﬁ c encoder,

not to the complete system. Any

operation of the encoder outside of the

speciﬁ ed range or for any other than the

intended applications is at the user’s

own risk.

Mounting

Work steps to be performed and

dimensions to be maintained during

mounting are speciﬁ ed solely in the

mounting instructions supplied with the

unit. All data in this catalog regarding

mounting are therefore provisional and

not binding; they do not become terms

of a contract.

Changes to the encoder

The correct operation and accuracy of

encoders from HEIDENHAIN is ensured

only if they have not been modiﬁ ed. Any

changes, even minor ones, can impair

the operation and reliability of the

encoders, and result in a loss of

warranty. This also includes the use of

additional retaining compounds,

lubricants (e.g. for screws) or adhesives

not explicitly prescribed. In case of

doubt, we recommend contacting

HEIDENHAIN in Traunreut.

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