25
NT935 ETH
CHn STORY
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
--
TRIP
ALARM
--
--
--
FOC
FCC
RELAY STATUS (coil energizing status)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
--
--
--
FAULT
Relay 1=ON
TRIP Relay
1=ON
ALARM
Relay 1=ON
FAN_2
Relay 1=ON
FAN_1
Relay 1=ON
CPU ERROR
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
--
--
--
--
PT ERROR
CAL
FCD Fault
ECH
CPU SETTING
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
--
--
--
Failsafe
fault
Failsafe trip
Failsafe
alarm
--
--
The NT935 ETH has n.o selection (contact open ) / n.c (normally closed contact) for ALARM, TRIP and FAULT relays,
programming steps 30 to 35 page 14. The selection of the setting YES/NO introduces functions Fail Safe and No Fail
Safe.
ALARM AND TRIP
Setting NO (NO Fail safe) normally open contacts are in positions 5-7 Alarm and 8-10 Trip, they switch only when limits
are reached preset temperature.
Setting YES (Fail Safe) normally closed contacts are in positions 5-7 Alarm and 8-10 Trip, they switch only when limits
are reached preset temperature.
FAULT
Setting YES (Fail safe) the contact 11-12 is positioned as normally open, switches (closed) when a fault condition is
identified; see section on page 12 alarms and ventilation.
Setting NO (NO Fail safe) the contact 11-12 is positioned as normally closed, switches (open) when a fault condition is
identified; see section on page 12 alarms and ventilation.
Disabling the failsafe function on the fault contact, the unit will no longer be able to report the fault for lack of power. In
this case it is suggested that the enabling of the fail safe on the ALARM contact for the above indication.
NOTE: When the unit is located in one of the methods described below does not monitor heat, also the relay will all be
banned,
the FAULT led start blinking.
Vis. display programming.
PRG programming.
Test of the relays.
The FAIL SAFE is temporarily disabled The FAULT relay switches.
FAIL SAFE FUNCTION
