Wiring - nvent 910 Series Installation, Operating And Maintenance Instructions

Communications interface

2.7 WIRING

10 | nVent.com
The user may want to consider enclosure drain holes in applications where moisture is a
problem; drill 0.125" holes in the bottom of the enclosure on both the left and right sides.
Two holes reduce the possibility that one will plug and ensures drainage if the enclosure is not
perfectly level. Note that drilling holes in the enclosure compromises the NEMA 4 rating.
2.6.1 Controller Installation and Removal
CAUTION:
Always ensure that the power to the unit is turned off during installation or removal to avoid
the risk of injury and damage to the controllers.
WARNING:
Explosion Hazard! Do not install or remove the control module while the unit is powered.
type label (optional)
L1/Line in
L2/Neutral in
L1/Line out to tracer
L2/Neutral out to tracer
Fig. 2.1 Control module face
Wiring diagrams for typical configurations are included in Appendix C of this manual.
CAUTION:
Always verify wiring connections before applying power to the controller or connected circuits.
To avoid injury or equipment damage, do not install or remove wiring while controller power is
on. To minimize the chance of loose connections, the 910 uses lever-operated, spring-loaded
terminals for signal wiring. See Appendix A for allowable wire sizes and recommended
insu- lation strip lengths.
2.7.1 TEMPERATURE SENSOR CONNECTIONS
Use shielded, twisted, three-conductor wire for the extension of RTD leads. The wire size
should ensure that the maximum allowable lead resistance is not exceeded. Shields on RTD
wiring should be grounded at the controller end only, using the terminals provided.
Temperature Sensors
Shield
TS 1 Source (WHT)
D910 SERIES
AC alarm output
Terminal No.
19
20
HTCBus communications address
Communications status indicators
Alarm status indicator
Output status indicator
RTD, communications, inhibit/override
input, alarm dry contact output
D910-010