Matrix
®
APAX Installation Guide 380V - 415V
Form: MX-IG-E January 2018 REV. 002 mtecorp.com 8
Grounding
Cable Shield Grounding
For cable shield grounding follow the drive manufactures recommendations.
Grounding and Ground Fault Protection
The filter must always be grounded with a grounding conductor connected to all ground
terminals.
Due to high leakage currents associated with variable frequency drives, ground fault protective
devices do not necessarily operate correctly when placed ahead of a Matrix Filter feeding a
drive. When using this type of device, its function should be tested in the actual installation.
Over Temperature Interlock
An over temperature interlock circuit should be used in conjunction with thermal switch to turn
off the drive to prevent filter damage due to abnormal operating conditions. The temperature
switch is normally closed and will open when an internal reactor temperature of 180°C is reached.
See Table 3-1 below for contact rating information and the drive user manual for
interconnection information.
Table 3-1: Over Temperature Switch
NC Switch
opens at 180 Deg. +/- 5 Deg. C
Current Amps Voltage
Contact Load
6
120 AC
Resistive Loads
3
120 AC
Inductive Loads
3
240 AC
Resistive Loads
2.5
240 AC
Inductive Loads
8
12 VDC Resistive Loads
4
24 VDC Resistive Loads
MTE strongly recommends the use of the over temperature switch to prevent damage to the
filter in rare instances of overheating from abnormal operating conditions.
WARNING
The filter must always be grounded with a grounding conductor connected
to ground terminals.
