Basler BE1-CDS220, Instruction Manual

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BE1-CDS220 Input And Output Functions 3-11
0.200 Sec
0 Sec OR
ONE SHOT TIMER
AND
OUT[n]
HARDWARE
OUTPUT
OUTPUT
STATUS
AND
AND
OR
Control Override (0/1)
Override State (0/1)
Hold State (0/1)
VO[n]
VIRTUAL OUTPUT
CONTROLED BY SL-VO[n]
LOGIC EQUATION
HOLD ENA
(SG-HOLD COMMAND)
OUTPUT CONTROL
(CO-OUT COMMAND)
AND
ALMREL
D2647-18
08-20-98
Figure 3-6. Output Logic, General Purpose Output Contacts
0.200 Sec
0 Sec
OR
ONE SHOT TIMER
AND
OUT[A]
HARDWARE
OUTPUT
OUTPUT
STATUS
AND
AND
OR
Control Override (0/1)
Override State (0/1)
Hold State (0/1)
VO[A]
VIRTUAL OUTPUT
CONTROLED BY SL-VO[n]
LOGIC EQUATION
HOLD ENA
(SG-HOLD COMMAND)
OUTPUT CONTROL
(CO-OUT COMMAND)
ALMREL
D2647-19
08-20-98
NOT
Figure 3-7. Output Logic, Fail-Safe Alarm Output Contact
Retrieving Output Status
Output status is determined through BESTCOMS by selecting Metering from the Reports pull-down menu
and selecting the Start Polling button in the upper portion of the screen. Alternately, status can be
determined through the HMI using screen 1.4.2, STAT\OPER\OUT, and from the ASCII command
interface using the RG-STAT (report general-status) command or RG-OUTSTAT (report general-output
status) command. See Section 6, Reporting and Alarm Functions, General Status Reporting for more
information.
Relay Trouble Alarm Disable
When the relay self-diagnostics function detects a problem in the relay, it sets internal alarm condition
ALMREL. See Section 6, Reporting and Alarm Functions, Alarms Function for more details on this
function. This alarm condition disables the outputs and de-energizes the OUTA relay closing the OUTA
contact.
Programmable Hold Timer
Historically, trip contact seal-in circuits have been provided in electromechanical relays. These seal-in
circuits consisted of a dc coil in series with the relay trip contact and a seal-in contact in parallel with the
trip contact. The seal-in feature serves several purposes for the electromechanical relays. One is to
provide mechanical energy to drop the target. Two is to carry the dc tripping current from the induction
disk contact, which may not have significant closing torque for a low resistance connection. Three is to
prevent the relay contact from dropping out until the current has been interrupted by the 52a contacts in
series with the trip coil. If the tripping contact opens before the dc current is interrupted, the contact may
be damaged. The first two of these items are not an issue for solid-state relays, but the third item is an
issue.
To prevent the output relay contacts from opening prematurely, a hold timer can hold the output contact
closed for a minimum of 200 milliseconds. Alternatively, if the protection engineer desires seal-in logic
with feedback from the breaker position logic, he can provide this logic by modifying the BESTlogic
expression for the tripping output. How to do this is described in Section 7, BESTlogic Programmable
Logic, Application Tips.