Initial Power-Up; Setup For The 910 - nvent 910 Series Installation, Operating And Maintenance Instructions

2.8 INITIAL POWER-UP

2.9 SETUP FOR THE 910

CAUTION:
Before applying power to the controller, ensure that powering the 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 910 has been suitably programmed for correct and safe
operation.
2.8.1 INITIAL CABLE TEST
To minimize the risk of damage to the controller due to a cable fault, the integrity of the
heating cable should be verified by:
1. Performing a high voltage insulation test using a "Megger"
2. Using an ohmmeter to ensure that the heating cable is not shorted
These tests must be performed with the controller output disconnected.
Once the cable has been checked, it may be reconnected to the controller and power applied.
2.8.2 RANDOM START DELAY
All 910 Series Control Modules incorporate a RANDOM START-UP DELAY feature, ensuring that
all units do not power on at the same time. When power is first applied to a controller, it will
hold its output off for a random time (0 to 9 seconds), equal to the last digit of the HTCBUS™
communications address (see Section 5.6.2). Once the start-up delay has timed out, the
controller will begin normal operation.
The 910 may be programmed using the Operator Console, or if a communications option is
installed, with an external communicating device. For instructions on the operation of these
devices, refer to the corresponding operating manuals. For complete instructions on pro-
gramming the 910, see the Programming and Configuration Section of this manual.
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