BENSHAW RediStart MX2 SEP, User Manual

Page: 21 / 130

3 - Installation
21
3.2.2 EMC Installation Guidelines
General In order to help our customers comply with European electromagnetic compatibility standards,
Benshaw Inc. has developed the following guidelines.
Attention This product has been designed for Class A equipment. Use of the product in domestic
environments may cause radio interference, in which case the installer may need to use
additional mitigation methods.
Enclosure Install the product in a grounded metal enclosure.
Grounding Connect a grounding conductor to the screw or terminal provided as standard on each
controller. Refer to layout/power wiring schematic for grounding provision location.
Wiring Refer to Wiring Practices on Page 22.
Filtering To comply with Conducted Emission Limits (CE requirement), a high voltage (1000V or greater)
0.1 uF capacitor should be connected from each input line to ground at the point where the line
enters the cabinet.
3.2.3 Application Considerations
Although the MX SEP controls and provides protection for the motor field current, protection of the motor’s
stator windings must be addressed separate from the MX SEP package. For example, if the motor is started
using a Benshaw motor starter, the overcurrent protection on the starter can be set to provide overcurrent
protection of the stator windings in cases such as the rotor puling out of synchronization. Additionally, a low
Power Factor trip can be used to detect when the rotor is no longer synchronized.
3.3 Mounting Considerations
Provisions should be made to ensure that the temperature inside the enclosure never rises above 122
o
F /
50
o
C. If the temperature inside the enclosure is too high, the controller can be damaged, and the operational
life can be reduced.
The field supply produces 4 watts of heat per amp of current, and 26 square inches of enclosure surface is
required per watt of heat generation. Contact Benshaw and ask for the enclosure sizing technical note for more
information concerning controllers in sealed enclosures. Benshaw supplies controllers under 124 amps non-
bypassed, with the heat sink protruding from the back of the enclosure. This allows a small enclosure size,
while still maintaining the cooling capability of the controller.
Table 5: Ventilation Requirements
Current Range Bottom of Enclosure Top of Enclosure
< 200 amps Fans or grills depending on enclosure size
200 to 300 amps 2 x 4” grills (12 sq. in.) 2 x 4” grills (12 sq.in.)
301 to 400 amps 1 x 4” fan (115 cfm) 2 x 4” grills (12 sq.in.)
401 to 600 amps 2 x 4” fan (230 cfm) 2 x 6” grills (28 sq.in.)
601 to 700 amps 2 x 6” fan (470 cfm) 2 x 6” grills (28 sq.in.)
> 700 amps Consult Factory Consult Factory