NV30/NV40 Operations and Maintenance Manual Routine maintenance
Page 3-2 Issue 3.3 2014-12-10
2. Clean the NV30/NV40 using a vacuum cleaner and a soft-bristle brush to remove loose dirt.
Clean, damp rags should be used to remove dirt that cannot be removed with a vacuum
cleaner. Never use compressed air to clean the NV30/NV40.
3. Clean the 17-inch LCD monitor on the front door as follows:
– Open the transmitter’s front door and gain access to the rear of the LCD monitor.
– Remove the cover that protects the connectors at the bottom of the LCD monitor,
noting it is secured using seven M4 nuts, split washers and flat washers. Retain hardware.
– Disconnect the round, black DC INPUT plug from the bottom, left of the monitor. This
removes power from the monitor, which makes it easier to see dirty or oily areas on the
screen and also prevents any inadvertant touch-screen operation.
– Use a dry, soft microfiber cloth and very gently wipe the screen. Do not press hard in an
attempt to scrub off dirt or oil. If necessary, dampen the cloth with distilled water
– When complete, reconnect the DC INPUT plug to the monitor and re-install the cover.
Checking hardware
All hardware must be checked at least once a year. Thermal cycling from turning the NV30/NV40 on
and off will require more frequent checks.
• To prevent damaging the hardware, ensure that the proper sized tools are used. In most
cases, hardware is metric.
• A mounting surface or terminal that has changed colour indicates a loose hardware connec-
tion.
• Ac input cables installed on terminal block TB1 must be checked and, if necessary,
retorqued. See Section 4, Connecting Ac Power of the NV30/NV40 Installation Manual to
determine specific torque values.
Battery replacement
The NV30/NV40's control/interface PWB contains a battery backup circuit that provides a memory
of transmitter alarm occurrences during ac power failure. See “Replacing the control/interface PWB
battery” on page 3-6.
Each exciter’s (A or B) NVE exciter PWB contains a battery backup circuit that provides a memory
of exciter alarm occurrences during ac power failure. See “Replacing the NVE exciter PWB battery”
on page 3-7.
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