4 FDM - Frequency Deviation Monitoring
The module FDM180 was designed to calculate and
monitor the frequency and its deviation in 50/60Hz
power line networks.
A preconnected reference is necessary that provides a
serial time string and a PPS (pulse per second). The
accuracy of the measurements is derived from these
signals. The module calculates the frequency as well
as the time, based on the mains frequency. The time
deviation (TD) is the difference of this calculated time
(PLT) to the reference time (REF). This time deviation
as well as the frequency itself is sent out via serial
interface or is beeing converted to an analog voltage
output provided by a DAC.
Pin Assignement:
16-pin DMC Phoenix Connector
Pin
Signal
——————————————————-
Pin 1
A0
Pin 2
A1
Pin 3
GND
Pin 4
n.c.
Pin 5
n.c.
Pin 6
GND
Pin 7
COM 0 RxD in
Pin 8
COM 0 TxD out
Pin 9 - Pin 14
GND
Pin 15
COM 1 RxD in
Pin 16
COM 1 TxD out
——————————————————-
LED Indicator
LED St:
Init
blue during inintialisation
green - normal operation
LED In:
shows the state after initialisation
red
ref not connected / FDM not sync
yellow
ref. signal not useable
green blinking Timesync
green
Accurate (
≤
200 ns to reference)
LED A:
green
FD (Frequency Deviation) within the configured limits
red
FD Overflow
LED B:
green
TD (Time Deviation) within the configured limits
red
TD Overflow
8
Date: 4th November 2020
IMS-FDM Setup Guide
