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This type of alarm is conditioned by use of the current transformer input. (T.A.)
It signals variations of load absorption by discriminating the level of current at the transformer input in the range (0...HI.A). It is
enabled with configuration code (AL.n); in this case the alarm trip value is expressed in HB scale points.
Select the type of functioning and the assigned control output by means of code Hb.F ("Out" phase).
The alarm limit setting is A.Hb.
The direct HB alarm trips if the value of the current transformer input is below the set limit for Hb.t seconds inclusive of "ON"
time of the selected output.
The HB alarm can be activated only with ON times longer than 0.4 seconds.
HB alarm function also includes control of load current in the OFF interval of the cycle time for the selected output: the HB
alarm will trip if the measured current exceeds approximately 12.5% of the full scale set (parameter HI.A in InP) for Hb.t
seconds inclusive of the OFF state of the output.
The alarm is reset automatically if the cause of the alarm is eliminated.
Setting a limit of A.Hb = 0 disables both types of HB alarms, with de-energizing of the assigned relay.
Indication of load current is displayed by selecting term C.T. (level 1).
NOTE: ON/OFF times refer to the cycle time set for the selected output.
Alarm Hb_F = 3 (7) continuous is active for a load current value below the set limit; it is disabled if the value of the
heating(cooling) output is less than 2%.
12
r. o . 1
0
signal: HEAT, COOL, AL1,
r. o . 2
2
signal: HEAT, COOL, AL1,
r. o . 3
3
signal: HEAT, COOL, AL1,
Cycle time OUT1 relay or
(t. 1
10
Cycle time OUT2 relay or
(t. 2
10
(t. 3
Cycle time OUT3 relay or
10
rEL.
0
(definition of state
in case of broken
sensor) alarms
AL1, AL2, AL3.
Select intrinsic
1) In case of broken sensor, the logic state of the alarm assumes the logic value selected without consideration of
alarm type (direct or reverse): ON = alarm active, OFF = alarm inactive.
2) Alarms are assigned to available outputs by setting codes r.o.1, r.o.2, r.o.3.
Pro
Protection code
Pro
Display
0
SP, alarms, OutP
1
SP, alarms, OutP
2
SP
3
SP
+4 disables InP, Out
+8 disables CFG
+16 disables "SW turn on - turn off"
+32 disables MAN/AUTO key
+ 64 to disable manual power memorization
FUNCTION OF HB ALARM (only for mod. 401)
r.o.x MAIN logic output function, relay (OUT1)
OUT 1
0
HEAT (heating control output)
Attribution of reference
1
COOL (cooling control output)
2
AL1 - alarm 1
AL2, AL3
3
AL2 - alarm 2
4
AL3 - alarm 3 [A.Hb mod. 401])
5
-
OUT 2
6
LBA - alarm LBA
Attribution of reference
7
(AL1) OR (AL2)
8
(AL1) OR (AL2) OR (AL3 [A.Hb mod. 401])
AL2, AL3
9
(AL1) AND (AL2)
10
(AL1) AND (AL2) AND (AL3 [A.Hb mod. 401])
OUT 3
+ 16 for logic level denied at output
Attribution of reference
AL2, AL3
N.B. When T.A. input is present, Out3
(if configured) is limited to indication of
corresponding LED.
mod. 401
1. ... 200 sec
logic = HEAT or COOL
1. ... 200 sec
logic = HEAT or COOL
1. ... 200 sec
logic = HEAT or COOL
rEL
Alarm
Alarm
1
2
Fault action
0
OFF
OFF
1
ON
OFF
2
OFF
ON
3
ON
ON
4
OFF
OFF
5
ON
OFF
safety.
6
OFF
ON
7
ON
ON
• Prot
Change
SP, alarms
SP
SP
mod. 401
Alarm
3
OFF
OFF
OFF
OFF
ON
ON
ON
ON
To activate the turn off SW function, press keys F
F +
for 5 secs. in P.V.
Δ
To return to normal functioning, press key F for
5 secs.
81503D_MHW_400-401_12-2010_ENG
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