Manual 26710V1
ProTechTPS Total Protection System
Woodward
31
Since the ProTechTPS is designed to detect a failure of either power
supply input, a continuous “Power Supply Fault Alarm” will be
issued if power-sources are not connect for both power supply
inputs.
Each ProTechTPS module requires a power source capable of a certain output
voltage and current. In most cases, this power rating is stated in Volt-Amps (VA).
The maximum VA of a source can be calculated by taking the rated output
voltage times the maximum output current at that voltage. This value should be
greater than or equal to the VA requirement listed.
Each power source must be provided with an external disconnecting
means that is identifiable to the specific power supply (A, B, or C).
A PE (Protective Earth) ground wire for each of the high voltage
power supplies must be connected to PE ground. The PE ground
connection wire must originate and be connected to PE at the power
source. The PE ground wire must follow the power wires to the
applicable power input connector PE Ground pin, so that each HV
input has a PE ground. The PE ground wire gauge must be capable
of handling the same current as the individual power wiring.
A PE (Protective Earth) ground wire for the enclosure must be
provided and connected to PE Ground. At least one of the
enclosure’s PE labeled connection points must have a wire going
from the enclosure to a building PE ground point. This wire must be
of sufficient gauge to handle the rated current of all the interposing
relay wires or 1.5 mm
2
(16 AWG), whichever is larger.
Shielded Wiring
All shielded cable must be twisted conductor pairs with either a foil or a braided
shield. A braided shield is preferred and highly recommended. All analog and
communication signal lines should be shielded to prevent picking up stray signals
from adjacent equipment. Connect the shields as shown in the control wiring
diagram (Figure 2-7). Wire exposed beyond the shield must not exceed 50 mm
(2 inches). The shield termination should be done with the shield by opening the
braid and pulling the wires through, not with an added wire. If a wire is used it
must be the largest gauge accepted by the shield lug terminal. The other end of
the shield must be left open or grounded through a capacitor and insulated from
any other conductor. Do not run shielded signal wires with other wires carrying
large currents or high voltages. See Woodward manual 50532,
EMI Control in
Electronic Governing Systems
, for more information.
Installations with severe electromagnetic interference (EMI) may require relay
and discrete input wiring to be shielded, conduits and/or double shielded wire
may be needed, or other precautions may have to be taken. These additional
precautions may be implemented in any installation. Contact Woodward for more
information.
