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Operating Instructions – Explosion-Proof AC Motors DR63/eDR63, DVE250/280
5
Accessory equipment
Electrical Installation
5.14.8 Protection with motor protection switch and additional PTC thermistor
The conditions stated for exclusive protection with motor protection switches also apply
here. Protection with positive temperature coefficient thermistors (TF) only represents a
supplementary protection measure which is irrelevant to certification for potentially ex-
plosive atmospheres.
5.15 Accessory equipment
Connect accessory equipment as shown in the wiring diagram(s) provided with the mo-
tor.
If the wiring diagram is missing, do not connect or start up any accessory
equipment.
The applicable wiring diagrams are available from SEW-EURODRIVE free
of charge.
The following optional equipment is used depending on the category, see the following
table:
5.15.1 Temperature sensor /TF
The PTC thermistors comply with DIN 44082.
Resistance measurement (measuring instrument with V
≤
2.5 V or I < 1 mA):
• Standard measured values: 20 – 500
Ω
, thermal resistance > 4000
Ω
When using the temperature sensor for thermal monitoring, the evaluation function must
be activated to maintain reliable isolation of the temperature sensor circuit. If the tem-
perature reaches an excessive level, a thermal protection function must be triggered im-
mediately.
If there is a 2nd terminal box for the TF termperature sensor, you must connect the tem-
perature sensor in that terminal box.
Observe the provided wiring diagram for the connection of the TF temperature sensor.
If the wiring diagram is missing, you can obtain it from SEW-EURODRIVE free of
charge.
INFORMATION
Check during startup whether a trip of the protection device shuts down the drive prop-
erly.
Optional equipment
Category 2
Category 3
Temperature sensor /TF
x
x
Forced cooling fan /VE
–
x
NOTICE
Damage of the temperature sensor due to excessive heat.
The drive system might be damaged.
• Do not apply voltages > 30 V to the TF temperature sensor.
INFORMATION
The temperature sensor TF may not be subjected to voltages > 30 V.