The printed circuit board underneath the JP7 terminal block can reach a normal operating temperature of
approximately 90 °C. The controller specifications are based on using wires connecting to JP7 to meet UL 1015
requirements and have a wire size of 2.02 mm
2
effective cross-sectional area, which is comprised of 41 strands of
0.254 mm diameter copper wire. The effective equivalent wire size is 14 AWG. The specifications are further based
on a wire length of 410 mm between the power supply and the controller and a wire length of 920 mm between the
controller and the TE device. Using wire with a smaller conductor cross section and/or shorter in length might cause
abnormally high temperature to be present on the JP7 terminal block and wire. If smaller and/or shorter wire must
be used, the amount of current the controller can safely accept might need to be decreased and/or the ambient
temperature at which the controller can operate might need to be lowered.
The wires inserted into connector JP7 should have a strip length of 7 mm, be fully inserted into the connector, and
the JP7 screw terminals should be tightened with a minimum torque of 0.5 N-m. The allowable cross sectional area
for the conductors is 0.2 — 2.5 mm2 (AWG 24 — 14).
The wires inserted into connector JP2 should have a strip length of 9-10 mm and be fully inserted into the connector.
Do not allow uninsulated wire strands to create electrical shorts between adjacent terminals. The allowable cross
sectional area for the conductors is 0.2 — 1.5 mm
2
(AWG 24 — 16), except 0.16 mm
2
(26 AWG) wire can be used for
the sensor inputs.
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