Three-phase squirrel cage induction motors in flameproof enclosure type ASA and E2-ASA
frame size 63 – 355
The motors can be fed from PWM frequency converters (VACON or
similar) according to the torque/speed characteristic M=f(Hz) given in
Annex 7 For that application the motors are equipped with direct
temperature control using the embedded PTC sensors (130 °C
5 °C).
The thermistors must be connected to a thermistor circuit relay functioning
independently of any measurement or control devices required for
operation and that is dedicated to reliably trip off the supply of the motor
according to the requirements of the “Essential Health and Safety
Requirements” in Annex II, item 1.5.1 of the ATEX Directive 94/9/EC.
Emergency stop controls of safety devices must be fitted with restart
lockouts. A new start command may take effect on normal operation only
after the restart lockouts have been intentionally reset.
2.2
The motors are manufactured using insulation materials of class F
The windings insulating resistance should not be lower than:
o
20 MOhm in cold condition
o
3 MOhm in warm condition
2.3
The motors rated duty is the continuous duty S1, according to EN
60034 –1 par. 4.2.1. but frequency converter feeding according par.
2.1 is also allowed. The motors fed from frequency converters can
operate under S9 duty, according to EN 60034 –1 par. 4.2.9.
2.4
The normal degree of protection according to EN 60529 of the
motors operating in Zone 1 is IP55. On request, motors having IP
56, IP 65 or IP 66 protection degree are also available.
2.4.1
The protection degree of the motors operating in Zone 21 is IP65; on
request, IP66 protection degree is also available.
2.5
The method of cooling of the motors according to EN 60034 –6 is IC
411.
2.6
The motors could be manufactured in the following mounting
arrangements:
IM 1001, IM 1002, IM 2001, IM 3001, IM 1011, IM 3011 for the
frame sizes 80-355 and IM 3601 only for the frame sizes 63 -160,
according to EN 60034-7
The overall and mounting dimensions are indicated in:
- Annex 3 - Tables 5.1 and 5.2 for the constructive types IM 1001
- Annex 3 - Tables 6.1 and 6.2 for the constructive types IM 3001
