Maintenance Forecast Monitor Function
(Indication and output)
What is “Maintenance Forecast Monitor Function” ?
The power supply unit is equipped with electrolytic capacitors.
The electrolyte inside the electrolytic capacitor penetrates the sealing rubber and evaporates as time passes since it is manufactured ( 1), which causes deterioration of
characteristics such as decreasing the capacitance ( 2), etc.
Due to this deterioration of the characteristics of the electrolytic capacitor, the power supply unit decreases its performance as time passes.
The maintenance forecast monitor function shows an approximate period left for maintenance of the power supply unit due to deterioration of electrolytic capacitors.
When the period left for maintenance that the power supply forecasts reaches the set value, an alarm is indicated and an output signal is triggered.
Use this function to know the approximate replacement timing of the power supply unit.
Note:
THE MAINTENUNCE FORECAST MONITOR FUNCTION INDICATES AN APPROXIMATE PERIOD LEFT FOR MAINTENANCE, BASED ON DETERIORATION OF
THE ELECTROLYTIC CAPACITOR. IT DOES NOT PREDICT FAILURES CAUSED BY OTHER REASONS.
Principle of operation
The deterioration speed of the electrolytic capacitor varies considerably according to the ambient temperature. (Generally the speed follows “Rule of Two for every
10
°
C” ; for every 10
°
C increase in temperature the rate of degradation doubles according to Arrhenius’s equation.) The MDC6-12024A-M2 monitors the temperature
inside the power supply, and calculates the amount of deterioration according to the running hours and inside temperature. Judging by this amount of deterioration, the
power supply will give the alarm indication and output when the period left for maintenance reaches the set value.
Notes:
1.Due to degradation of internal electronic parts, replace the power supply at least once every 15 years even if indication and output of maintenance forecast monitor are not issued.
2.The maintenance forecast is accelerated or decelerated according to operating conditions. Periodically check indication.
3.The output may turn ON and OFF alternately according to the acceleration or deceleration of Maintenance forecast.
4.
Indication and Output
When the product is purchased, “
ful
” (
3) will be indicated. As electrolytic capacitors deteriorate, indication changes to “
hlf
” (
4). After the remaining time to maintenance is
reduced to two years, indication automatically changes to a value (
5), which decreases from “
1.5
” to “
1.0
” to “
0.5
” to “
0.0
” (year) as the running hours increase.
If the maintenance forecast monitor setting is set to a value larger than two years, value indication automatically begins after the remaining time to maintenance is reduced to the set years.
If the remaining time becomes smaller than setting L (which can be set arbitrarily between 0 and 5.0 years), an alarm (
a02
) and the remaining time are indicated alternately.
And an output is given to an external device from a transistor ( Yrs) to notify of the replacement timing, together with indication. (The output is turned off after the replacement timing is
reached; with no continuity across and .)
Notes:
1.The remaining time to maintenance is based on continuous operation, not including the time when the power supply is turned off, and so may take longer to reach than the
actual time indicated.
2.Until the power supply has been turned for about one month in total, indication is fixed at “
ful
” to estimate the extent of deterioration, while the output remains turned
on (with continuity across and ).
PERIODIC CHECK
It may takes from several years to several tens of years under general operating conditions for the power supply to give the maintenance forecast monitor alarm. During
operation over an extended period of time, periodically check if the maintenance forecast monitor output ( Yrs) is correctly functioning by the following procedure.
1.Select the operation mode.
2.Check that the output ( Yrs) is turned on (with continuity across and ).
3.In the operation mode, press and hold the (
) and
M
(
) keys simultaneously for at least three seconds.
The main display (
) changes to “
a02
.”
An inactive output ( Yrs) (no continuity across and ) in the “
a02
” indication indicates the correct function.
4.Release keys to return to the regular state.
Note: DC output stays ON while the periodical check.
©All Rights Reserved
EN
Fig. 1
MDC6-12024A-M2
11 12 13
6
10
9
7
8
Undervoltage alarm function
Fig. 2
2
1
L-0.5
:
:
5
4
3
Fig. 3
Remaining years to
maintenance timing
Main display
Capacitance
of capacitor
AC input
Output voltage
Main display
Operation mode
(Selected indication)
a01
Lowest value of output voltage
Voltage indication
Operation Manual
MODEL
MDC6
Thank you for purchasing this M-System product.
This manual primarily describes precautions
required in operating the power supply. Before
operating the product, read this manual thoroughly
to acquire sufficient knowledge of the product to
use it safely and correctly. Keep this manual close
at hand and use for reference during operation.
Read the MDC6 Instruction Manual together with
this manual without fail.
EN
DC POWER
SUPPLY
Fig.3
Nomenclature
Detection value of
Undervoltage alarm
M-SYSTEM CO., LTD.
Undervoltage
output
In case of setting L between 2.5 and 5 years
In case of setting L between
0 and 2 years
Undervoltage alarm Function (Indication)
Fig.2
When output voltage drop is detected, an alarm (
a01
) and lowest output
voltage value are indicated alternately.
The preset value of detection voltage can be changed in the setting
mode.
Further, the alarm is output from the transistor ( DC LOW) to an
external device.
(Upon output voltage alarm: OFF; with no continuity across and )
Notes:
1. Operation begins after about 3 seconds since the AC power is
supplied.
2. The alarm is not indicated in the setting mode.
3. Press the
M
(
) after the output voltage is restored, to reset alarm
indication.
4. The undervoltage alarm function monitors the output terminal voltage
of the power supply unit. To check the voltage accurately, measure
the voltage at the load end.
Operation and Function
Name and Function of Each Part
Fig.1
Indicates the measurement or set value.
L
ights up during indication of output current.
Lights up during indication of peak hold current.
Lights up when the output voltage is indicated.
Blinks during setup of undervoltage alarm value.
Use the up key to change to the setting
mode or to increase the set value.
Use the down key to change to the setting
mode or to decrease the set value.
Lights up during indication of maintenance
forecast monitor. Blinks during setup of
maintenance forecast monitor setting.
Use the mode key to change the indicated
parameter or reset the peak hold current
value.
Function
Name
Main display
V
A
Apk
Yrs
6
Operation
indicator
7
Mode key
8
Up key
9
Down key
10
Mode Change
Power-ON
Press and hold for three seconds or more.
Or no key operation for 30 seconds or more.
Press and hold or for three seconds or more.
Operation mode
Setting mode
Operation Mode
Various states of the power supply unit are indicated.
Note:
The output voltage will be displayed when the power supply is first turned
on after it is received from the factory. Thereafter, the main display will
be indicated in the same display when shutting down.
Setting Mode
Set various parameters of the power supply unit.
Maintenance forecast
monitor
Undervoltage alarm
The reverse video indicates
the shipment setting.
18.5 -
20.0
- 27.5(V)
0.1V intervals
0.0 -
0.5
- 5.0(years)
0.5 year intervals
Note:
Press and hold (
) or (
) for two seconds or more to increase or
decrease the value rapidly.
Output Voltage and Current Indication Function
The output voltage and current of the power supply unit are monitored
and indicated.
Note:
Operation begins after about 3 seconds since the AC power is supplied.
Peak Hold Current Indication Function
The maximum output current is memorized and indicated. The maximum
output current is always updated whatever the indication mode is. The
peak hold current is retained even if the AC power is turned off.
Note:
Operation begins after about 3 seconds since the AC power is supplied.
Peak Hold Current Reset
Operation mode
Reset
Peak hold current value
measurement starts
2 seconds
3 seconds or more
EN
Change over setting mode on pressing and
holding ( ) or ( ) for three seconds.
And check the set value of the corresponding point.
(The set value must return to the shipment
setting. Set the each value again, if neces-
sary.) The error message will be canceled
on changing over operation mode again.
No change
No change
No change
No change
Description
Output state
Restoration method
Main display
Noise detected in
voltage or current
When external noise is cleared,
indication is automatically restored.
When the overheat condition is removed,
indication is automatically restored.
Overheated
Other memory error
Undervoltage alarm set
value memory error
Turn the AC input off then on again.
If the product is not reset, contact the dealer.
Memory error of alarm
set value of maintenance
forecast monitor
Shipment setting or
value set in the
setting mode again
Setting after restoration
OFF
OFF
OFF
OFF
12
11
12
12
11
6
Notes:
1. External noise is probable as a cause of “
---
” and “
e0
” errors.
2. Incorrect operating conditions, ventilation error, and incorrect mounting direction are probable as a cause of
“
h,t
” error.
3. If the "
h,t
" error state continues for about three hours, the maintenance forecast monitor function becomes
invalid. The indication for maintenance forecast monitor remains as "
h,t
" even after the overheat condition is
removed, and the Yrs output ( ) remains OFF (with no continuity across and ). REPLACE THE POWER
SUPPLY IF THIS CONDITION OCCURS EVEN IF THE DC OUTPUT IS CORRECT, AS INTERNAL PARTS
MAY BE DETERIORATED.
Self-diagnostic Function
EN
In the case that the output voltage drops below the set value (19V)
and an alarm is issued
Output voltage
Output current
Peak hold current
Maintenance forecast monitor
At operation indicator ( ) ,
indicates a lit LED.
indicates a blinking LED.
0969710-6B (Side A)
