Emerson XC1015D

1592021021 XC1008-1011-1015D GB A5 r.1.5A 12.10.2009 XC1008-1011-1015D 42/66
OP = alarm conditions 84-85 closed
CL = alarm conditions 84-85 open
OT3 Alarm relay 1 off by keyboard It’s referred to the relays configured as ALr1
no = alarm relay remains on for all the duration of the alarm
yES = the alarm relay is switched off by pushing a key
OT4 Alarm relay 1 polarity
OP = the alarm relay terminals are open during an alarm
CL = the alarm relay terminals are closed during an alarm
OT5 Alarm relay 2 off by keyboard It’s referred to the relays configured as ALr2
no = alarm relay remains on for all the duration of the alarm
yES = the alarm relay is switched off by pushing a key
OT6 Alarm relay 2 polarity
OP= the alarm relay terminals are open during an alarm
CL = the alarm relay terminals are closed during an alarm
OT7 Serial address 1 ÷ 247
OT8 Serial address for keyboard not used
OT9 Off function enabling
no = it’s not possible to switch the controller off by keyboard
YES = it’s possible to switch the controller off by keyboard
7. Regulation
7.1 Neutral zone adjustment – only for compressors
This kind of regulation is available only for compressors. It is used if the parameter C37 = db (C38 =
db for circuit 2). The following observations are availables only for adjustment without inverter. In
this case the neutral zone (CP1) is symmetrical compared to the target set point, with extremes:
set+CP1/2 ... set-CP1/2. If the pressure (temperature) is inside this zone the controller maintains
the same number of loads switched on and off, without changing anything.
When the pressure (temperature) goes out from the zone, regulation starts. If the pressure is
greater than SET+CP1/2, the loads are switching on with timing given by CP11parameter.
A load is turned on only if the his safety times:
CP9 Minimum time between 2 following switching ON of the same compressor (0÷255 min).
CP10 Minimum time between the switching off of a compressor and the following switching on.
(0÷255min).
Note: usually CP9 is greater than CP10
CP13 Minimum time load on (0 ÷ 99.5 min; res. 1sec)
are over.
Regulation stops when the pressure (temperature) comes back into the neutral zone.
In the following a simplify example that explains the regulation in neutral zone for compressor
homogeneous with 1 step for each compressors. The safety times CP9, CP10, CP13 are not
considered. In the real regulation the a load is entered or turned off only if these times are over.
Ex. Dead band control, compressors with same capacities, 1 step for each compressor.
In this example:
C1 = cPr1; C2 = cPr1; C3 = cPr1; number of compressors first circuit.
C35 = db dead band regulation
C39 = yES rotation
CP16 = no “CP11” delay not enabled at first calling after an equilibrium condition.
CP17 = no “CP12” delay not enabled at first calling after an equilibrium condition.