Bender CMD420 Kurulum Bülteni / Referans Kılavuzu
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This document is intended as a reference guide for installing and using BENDER CMD420 and CMD421
three-phase AC current relays. This document includes installation, setup, and usage instructions. For
complete details, including installation, setup, settings, and troubleshooting, refer to the CMD420 /
CMD421 user manual, document number TGH1459en. This document is intended as a supplement
and not a replacement to the complete user manual.
Only qualified maintenance personnel shall operate or service this equipment. These instructions
should not be viewed as sufficient for those who are not otherwise qualified to operate or service this
equipment. This document is intended to provide accurate information only. No responsibility is as-
sumed by BENDER for any consequences arising from use of this document.
Installation
Mounting
CMD420 / CMD421 series devices may be DIN rail mounted, or screw mounted using the black
clips located on the top and bottom of the device. Screw mounting requires an extra black clip
(article number B98060008, sold separately).
Wiring - General
Refer to figure 1 for wiring the CMD420 or CMD421.
When using the CMD420, a current transformer with
1 A secondary (x/1 type) is required. For CMD421 de-
vices, a current transformer with a 5 A secondary (x/5
type) is required. Use minimum AWG 24, maximum
AWG 12 size wire. Refer to CMD420 / 421 series user
manual for complete technical details.
L3
2
k3
l3
L2
k1
l1
k2
l2
1
k3
l3
A1 A2
U
k1 l1 k2
S
A1
A2
K1
11 12 14
K2
l2
21 22 24
Figure 1 - Common wiring diagram for CMD420 and CMD421
Wiring - Contacts
Using a normally closed or normally open contact utilizes two factors: wiring out of the proper
terminal, and setting the respective contact to normally energized or deenergized operation.
Refer to the chart below for relay conditions. For changing the energized state of the contact,
refer to "Figure 7 - Contact operation" on the reverse side of this document.
The factory default is normally deenergized operation for relays K1 and K2.
Device Relay Conditions
Relay Operation Setting
Device Alarm State
Power ON, normal state (no alarms)
Normally deenergized mode (N/D)
Non-failsafe mode
Power OFF
"N/O" in device settings menu
Power ON, alarm state
Power ON, normal state (no alarms)
Normally energized mode (N/E)
Failsafe mode
Power OFF
"N/C" in device settings menu
Power ON, alarm state
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
! DANGER
HAZARD OF ELECTRIC SHOCK,
EXPLOSION, OR ARC FLASH
• Disconnect all power before servicing.
• Observe all local, state, and national
codes, standards, and regulations.
1.
External supply voltage; 5A fuse
required for internal device pro-
tection
2.
Connection to individual phase
conductors via current transform-
ers. Use x/1 type (1 A secondary)
for CMD420 and x/5 type (5 A sec-
ondary) for CMD421.
3.
Alarm relay K1: SPDT contact
4.
Alarm relay K2: SPDT contact
3
4
K1 STATE
11-12 CLOSED
11-14 OPEN
11-12 CLOSED
11-14 OPEN
11-12 OPEN
11-14 CLOSED
11-12 OPEN
11-14 CLOSED
11-12 CLOSED
11-14 OPEN
11-12 CLOSED
11-14 OPEN
Front Panel Display
1.
LED "ON" (green): Illuminates when
power is applied to the device. Flashes
when the CT connection alarm is active.
2.
LED "AL1" (yellow): Illuminates when
the prealarm is activated. Flashes when
the CT connection alarm is active.
3.
LED "AL2" (yellow): Illuminates when
the main alarm is activated. Flashes
when the CT connection alarm is active.
4.
Backlit LCD display
Dimensions
Dimensions listed in inches (mm).
K2 STATE
Menu Flow Chart for Common Settings
21-22 CLOSED
Figure 4 through figure 8 on the reverse side of this document contain flow charts for modify-
21-24 OPEN
ing commonly used features and settings in the device's main menu. Not all available features
are listed in this document. For more information, consult the CMD420 / CMD421 user manual.
21-22 CLOSED
21-24 OPEN
Menu Legend
21-22 OPEN
21-24 CLOSED
DOWN ARROW button
R
21-22 OPEN
21-24 CLOSED
UP ARROW button
21-22 CLOSED
T
21-24 OPEN
MENU / ENTER button
21-22 CLOSED
21-24 OPEN
CMD420 / CMD421
Installation Bulletin / Reference Guide
1
2
3
4
5
6
7
Figure 2 - CMD420 / CMD421 front display
5.
TEST / UP button: Activates self-test /
scrolls up inside main menu.
6.
RESET / DOWN button: Resets device /
scrolls down inside main menu.
7.
MENU / ENTER button: Activates main
menu / Confirms (momuntary push) or
goes back a step (held > 1.5 s) inside
main menu.
2.78"
(70.5)
1.87"
1.42" (36)
(47.5)
1.22" (31.1)
< 1.5 s
> 1.5 s
Document NAE1038810 • 01.2013 • © Bender Inc. • Page 1/1 • Side 1/2
Momuntary button push
Hold button for at least 1.5 s,
then release