Initial Power Up - nvent RAYCHEM T2000 Installation, Operating And Maintenance Manual

2.7 INITIAL POWER-UP
18 | nVent.com
source for all control modules. Power supply connections are made on the left-most slot
(see Appendix B for wiring details).
2.6.3 CT MODULE (CT 2000 & CT 2000-HAZ)
Electrical conductors for the heat tracing load pass through the CT module housing and do not
terminate at the CT module. CT signal wires terminate on the CT module terminal block located
on the top of the CT module.
For the CT 2000 module, the contactor coil control wires terminate on the CT module terminal
block located on the top of the CT module. Switch control and CT signals must be terminated
as shown in the wiring diagrams in Appendices B-1 to B-3
WARNING:
Be certain that power has been removed from the heating circuit and control module prior to
disconnecting the switch control or CT signal leads.
2.6.4 INTERCONNECTING MULTIPLE CARD RACKS
When using an AC 2000 alarm/communication interface card, up to 4 card racks (containing
a maximum of (40) CM 2000 or CM 2000+ control modules) may be daisy-chained together to
one AC 2000.
When using an AC 2000+ alarm/communication interface card, up to (26) card racks
(containing a maximum of (256) CM 2000+ control modules) may be daisy-chained together to
one AC 2000+.
IMPORTANT: The AC 2000+ may be used with CM 2000 modules, however a maximum of
4 card racks (40 CM 2000s) may be daisy-chained together.
When sharing a single alarm/communications interface card among multiple card racks, it is
always inserted in the left-most slot of the first card rack. The left-most slots of the remaining
card racks are left empty.
Each card rack has two terminal blocks on the back at either side, which allows for convenient
daisy-chaining of card racks. When daisy-chaining card racks, use twisted multi-conductor
shielded cable with the shield terminated on the terminal block provided at the previous
card rack. The termination resistors are only required on the last card rack in the chain.
See Appendices B4 and B5 for wiring details.
WARNING:
Before applying power to the RAYCHEM T2000 HTC:
• Close the panel door or stand clear of the RAYCHEM T2000 HTC. Although the control
modules incorporate overcurrent protection, a destructive switch failure can result from a
short circuited output. To avoid the possibility of any injury, no one should be directly in front
of the switches when they are initially powered up.
• Ensure that applying power to any heating circuit will not damage it if power limiting or the
setpoint temperature have not been set correctly. If there is any doubt, the load should be
disconnected until the control module has been suitably programmed for correct and safe
operation.
To minimize the risk of damage to the control module and its components due to a cable fault,
the integrity of the heating cable should be verified. This can be accomplished by performing
a high voltage insulation test using a "Megger" following the heating cable manufacturer's
instructions. Ensure that the heating cable is not shorted by measuring the resistance using an
ohmmeter.
These tests must be performed with the heating cable completely disconnected.
Once the heating cable has been checked, it may be reconnected and power applied.