Bender CMD421 Kurulum Bülteni / Referans Kılavuzu - Sayfa 2
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Figure 4 - Setting alarm type and CT ratio
The recommended first step is to set the type of alarm that will be used. Set this option to "HI"
for undercurrent, "LO" for undercurrent, or "In" for both (window function).
Regardless whether the CMD420 or CMD421 is being used, the ratio of the current transformer
used must be entered into the device as an X/1 type. For example, if using a 50:1 ratio CT with
the CMD420, enter a value of "50" for the CT ratio. If using a 250:5 ratio CT with the CMD421,
enter a value of "50" for the CT ratio.
NOTE: See below for instructions on setting alarm values. Alarm values will still be entered into
the device based on the secondary side (0 - 1 A for the CMD420, 0-5 A for the CMD421). How-
ever, since the CT ratio has been entered into the device, values on the primary side of the CT
will be displayed in real-time on the device's screen during operation.
> 1.5 sec
x 3
R
< 1.5 sec
< 1.5 sec
Press nothing for
overcurrent (HI)
otherwise:
R
1x for both (In)
2x for undercurrent (Lo)
< 1.5 sec
Figure 5 - Setting Alarm Values
The CMD420/CMD421 has two alarm values that may be set. Use the following guidelines for
setting these numbers:
•
Using only overcurrent OR undercurrent: Only one value is required. The value I
explicit alarm value that is set. The value I
vated, which is a percentage value based on the previously set trip value.
•
Using both overcurrent AND undercurrent: Both values are required. The value I
overcurrent value, entered as an explicit number. The value I
entered as a percentage of the previously entered overcurrent value. EXAMPLE: For an
overcurrent alarm of 2 A and an undercurrent alarm of 1 A, enter "2" for I
for I
.
1
> 1.5 sec
> 1.5 sec
< 1.5 sec
< 1.5 sec
I
I
2
2
A
A
< 1.5 sec
< 1.5 sec
I
I
2
2
A
A
T
T
R
R
Setpoint
Setpoint
Adjustment
Adjustment
< 1.5 sec
< 1.5 sec
R
R
Bender Inc. • USA: 800.356.4266 / 610.383.9200 / [email protected] • Canada: 800.243.2438 / 905.602.9990 / [email protected] • www.bender.org
T M
> 1.5 sec
x 2
To quit
> 1.5 sec
OR
To set CT
ratio
R
> 1.5 sec
= Flashing Symbol
T
R
Ratio Adjustment
> 1.5 sec
x 2
To quit
> 1.5 sec
is an optional prewarning that may be acti-
1
is the undercurrent value,
1
< 1.5 sec
< 1.5 sec
T
T
R
R
Setpoint
Setpoint
Adjustment
Adjustment
< 1.5 sec
< 1.5 sec
> 1.5 sec
> 1.5 sec
> 1.5 sec
> 1.5 sec
= Flashing Symbol
= Flashing Symbol
Figure 5 - Changing Time Delays
Four separate time delays are available:
•
t
on1
•
t
on2
Figure 6 - Latching behavior (fault memory)
Changing this setting affects the latching be-
havior of the device:
•
"OFF" will cause the device to automati-
cally reset if the alarm condition clears.
•
"ON" will cause the device to latch in the
event of an alarm and require a manual
reset. If power is cycled to the device
and the alarm condition has cleared, the
device will reset.
•
"CON" will cause the device to latch
in the event of an alarm and require a
manual reset. The device will remain
latched even if power is cycled to the
device.
is the
2
is the
2
, and enter "50%"
2
Figure 7 - Contact operation
Use this option to change the behavior of the contacts between normally deenergized (non-
failsafe) mode and normally energized (failsafe) mode. The two SPDT contacts may be changed
individually. Note that the CMD420/CMD421 labels normally deenergized operation as "N/O"
and normally energized operation as "N/C"; utilzing a normally open or normally closed con-
tact only depends on which contact output is wired.
CMD420 / CMD421
Installation Bulletin / Reference Guide
- Response delay, prewarning
•
- Response delay, main alarm
•
> 1.5 sec
R
Press Twice
< 1.5 sec
R
Press:
1 x for t
2
on
2 x for t
0...10 sec
3 x for t
off
0...99 sec
OR
= Flashing Symbol
< 1.5 sec
> 1.5 sec
T
Fault Memory
ON/OFF Select
T
Failsafe
> 1.5 sec
ON/OFF Select
R
< 1.5 sec
Press Once
> 1.5 sec
< 1.5 sec
R
> 1.5 sec
Press Once
= Flashing Symbol
< 1.5 sec
Document NAE1038810 • 01.2013 • © Bender Inc. • Page 1/1 • Side 2/2
t - Startup delay
t
- Delay on release
off
T
R
t
1 Adjustment
on
0...10 seconds
< 1.5 sec
> 1.5 sec
> 1.5 sec
< 1.5 sec
R
Press Once
> 1.5 sec
< 1.5 sec
> 1.5 sec
< 1.5 sec
= Flashing Symbol
R
R