ProTechTPS Total Protection System
Manual 26710V1
62
Woodward
Voted Trip Relay Output Specifications
Number of Channels
2 (both channels actuated simultaneously), see
wiring and installation
Output Type
Form C, dual SPDT
Contact Rating:
8 A @ 220 Vac / 8 A @ 24 Vdc
Max. Switching Voltage 220 Vac / 150 Vdc
Max. Switching Power
2000 VA / 192 W
Isolation
1500 Vac from contact to chassis and contacts to all
other circuits
Table 3-1b. Voted Trip Relay Specifications
Inputs and Outputs
Input Redundancy
Each ProTechTPS module shares its input values (speed, acceleration,
analog/discrete inputs, and dedicated-function discrete inputs) and its trip and
alarm latch outputs with the other two modules. Users can then optionally
configure the module’s trip and alarm logic to use or not use the shared input and
latch information. Configurable redundancy manager blocks are available for the
speed, acceleration, analog and Boolean signal redundancy logic. Optionally one
or all of the module’s dedicated-function discrete inputs can be configured with
“ORed” logic. This type of redundancy allows users the choice of using one two
or three speed sensors and connecting to (wiring to) three modules, two modules
or only one module and using the sharing and voting logic to manage logic in all
three modules.
Speed Sensor Inputs
Each module has one speed input which can be programmed to accept a
passive MPU (magnetic pickup unit), or an active speed sensor (proximity probe
signal or an eddy current probe signal).
When configured as an MPU signal input, special MPU open-wire detection
circuitry is used to validate that the MPU is properly connected before turbine
operation, and special loss-of-speed detection logic is used to validate speed
sensor functionality during turbine operation. Depending on the module’s
program settings a loss of speed signal or open-wire detection will result in a trip
or alarm condition.
MPU open-wire detection logic and associated trip/alarm action is
only utilized when the speed input is configured a “passive” probe.
When configured as an MPU signal input, the speed sensor circuitry will sense
MPU signals within the voltage range of 1—35 Vrms.
When configured as a proximity (active) probe input or eddy current probe input,
a 24 V power supply is provided to power the probe, but an isolated external
supply may be used instead, if referenced correctly.
The Number of Gear Teeth and Gear Ratio are configured to convert the
frequency input from the speed probe to the unit speed.
The Number of Gear Teeth and Gear Ratio must match the actual unit
hardware or speed sensing and all associated protection and
functionality will not work correctly.
