1. Introduction.
The IQT battery failsafe actuator
provides electrical operation after
loss of main AC electrical supply,
allowing the valve to be controlled
to a process, mains fail safe position.
On loss of AC supply, power is
provided from integral batteries
located in a extended version of the
terminal cover. With AC power
applied to the actuator, the batteries
are charged from the actuator.
There are three possible failsafe
actions that can be customer
configured:
Failsafe Close -
Close valve on loss of AC supply
Failsafe Open -
Open valve on loss of AC supply
Stayput waiting for command -
The actuator can then be directed
to operate via local or standard
remote control signals* within 30
minutes of AC power being
removed.
*Remote signals must be applied to
standard remote control inputs,
close on terminal 33, open on
terminal 35 or ESD on terminal 3 of
battery pack connector. On loss of
AC supply remote control via
Folomatic proportional control or
serial digital network signals are not
available.
*On loss of AC supply the IQT
battery failsafe does not support
customer nominal 24V DC supply
on terminals 4 (-ve) and 5 (+ve) and
therefore control signal supply must
be externally powered. Refer to
wiring diagram.
On loss of AC supply the IQT
battery failsafe does not support
analogue current position
transmitter (CPT) position feedback
or serial network communication.
The IQT monitor relay will de-
energise on loss of AC supply.
WARNING—CONTAINS BATTERIES:
FIRE, EXPLOSION AND SEVERE
BURN HAZARD. DO NOT SHORT
CIRCUIT. DO NOT INCINERATE.
DO NOT DISASSEMBLE BATTERY
PACK. RECHARGE ONLY AS PART
OF THE IQT. DO NOT EXPOSE
BATTERIES TO AMBIENT
TEMPERATURES ABOVE 60°C
THE IQT BATTERY FAILSAFE
ACTUATOR CONTAINS HIGH
CAPACITY BATTERIES WHICH ARE
CONNECTED TO ACTUATOR
TERMINALS 14 (+) AND 21 (_). DC
BATTERY POWER MAY BE
SUPPLIED TO THESE TERMINALS
WHEN THE AC ELECTRICAL
SUPPLY IS SWITCHED ON AND
SWITCHED OFF.
For safety the IQT Failsafe battery
pack is shipped with DC power
fuses FS3 and FS4 removed. It is
essential that the fuses are
removed before any maintenance
work is carried out on the
actuator or the battery assembly.
Before fitting Fuses FS3 and FS4
the IQT actuator must be
commissioned in accordance with
Publication no. E175E.
2. Battery Failsafe
Specification
Environmental:
Operating temperature -30°C to +
60°C.
Enclosure (IQT battery Failsafe
actuator): Watertight IP68 — 7m /
72 Hrs.
Battery Pack:
Type: Sealed lead–acid batteries
located in a vented enclosure.
Voltage & Capacity: 28V— 2.5Ah.
Float life: 8 Years at 20°C, 3 years at
40° C.
Storage Life: 2 years at 23°C, 2
months at 60° C.
Battery pack assembly weight:
5.5Kg. For total IQT battery failsafe
weight, add 5.5Kg to the actuator
weights listed in E175E, page 71.
IQT Battery Failsafe