Rotork IQM, IQML User Manual

‘IQM’ & ‘IQML’ RANGE

Publication E420E issue 7/02

CONTROL AND

MONITORING

FACILITIES

SPECIFICATION

The type IQM actuator specification is generally as described in
Publication No. E410E having a solid state reversing starter in
place of the electro-mechanical contactors, suitably rated 4­pole winding, low inertia motor and with the “hammerblow”
backlash omitted from the output gear train.

All other standard and optional IQ actuator features are
available with IQM modulating actuators subject to the
following:

Supply Voltage - maximum 480 volts, 50/60Hz.

Apply for higher voltages up to 575 volts.

Minimum voltage for the size IQM30 is 380 volts, 50/60Hz.

PERFORMANCE

The actuators are suitable for up to 1200 starts per hour with a
duty in accordance with IEC 34-1 to S4 50%. See E410E for
temperature rating.

SOLID STATE STARTER

The actuator design incorporates a solid state starter to
achieve an increased design life. Five pairs of 1600 volt
thyristors switch all three phases of the incoming power
supply. Thyristors are considered to be more suitable than
triacs for reversing applications and have a higher resistance to
transients in the power supply.

The design also includes snubbing and transient protection
circuits.

DYNAMIC BRAKING

The facility for dynamic braking is included as standard with
the ability to select this function by fitting an electrical link at
the actuator terminal block.

POSITIONAL ACCURACY

Repeatability with pulse control is 0.1 output turns.

POWER FUSE

It is essential that the power supply for each actuator is
protected by suitably rated high speed fuses mounted at the
power distribution panel. The required fuse characteristics are
as follows:

IQM10 to IQM20 IQM25 and IQM35

Rated current 10A 20A
Pre-arcing 1

2

t 5.4 A2s1

2

t 30 A2s

Total 12t 55 A2s1

2

T 250 A2s
Rated voltage 660V (IEC) 660V (IEC)
Suggested fuse Ferraz G330010 Ferraz K330013

CIRCUIT DIAGRAM

Standard IQM actuators are in accordance with wiring diagram
5000-000 as shown on page 6.

For aplications requiring seperately mounted starters, please
see details of M Range Syncroset actuators given on page 11.

CONTROL

Opto-isolators are used to interface the actuator’s internal
logic circuits with the remote controls. The basic circuits permit
various control facilities to be selected whether internally or
externally fed. As standard the actuators are designed for
positive switching remote control from digital signals.

Various control functions may be configured on site at the
time of commisioning using the Rotork IQ Setting Tool. In the
absence of specific instructions, actuators will be dispatched
with the control functions configured as shown on the
diagram on page 6.

PULSE CONTROL

Where pulse control is used the minimum pulse length should
be 18ms and the minimum time between pulses should be
500ms. Typical duration of motor energisation in response to
each minimum pulse control signal in the same direction will
be between 20 and 30ms. Where special units designed for use
with AC remote control supplies are required, the minimum
pulse length should be 300ms.

REMOTE CONTROL POWER SUPPLIES

Remote controls may be powered by the internally derived 24
volt DC power supply. Alternatively remote controls may be
powered by an external supply of 24DC. The appropriate
connections are shown on page 6. Please apply if suitability for
other remote control supplies is required.

LOCAL CONTROLS

The actuator is provided with Open, Close and Stop facilities
and Local/Remote selection, Local, Open and Close control is
configurable to either self-maintained or push-to-run.

EXTERNAL INTERLOCKS

Facilities are provided for the connection of external contacts
to inhibit Open and/or Close valve operation.

STATUS FEEDBACK

Four configurable status feedback contacts and monitor relay
are available as standard with IQM actuators.

PROTECTION

The motor is protected against single phasing or incorrect
phase rotation by the Rotork patented, Syncrophase circuit and
against overheating by the thermostat in the motor winding.
Opto-isolators provide protection against high voltage
transients for the interface with the remote controls.

EMERGENCY SHUTDOWN (ESD)

The ESD facility may be configured for Open or Close
operation with the option of by-passing the motor protection
thermostat, using the IQ Setting Tool.

IQM - STANDARD FACILITIES

3

OPTIONAL FACILITIES

The following optional facilities are available, and are covered
by the appropriate alternative wiring diagrams as indicated in
the wiring diagram number matrix on page 5.

FOLOMATIC CONTROLLER

The Folomatic enables standard IQM actuators to control the
position of a valve in proportion to an analogue current or
voltage signal.

A voltage derived from the actuator position sensor is
electronically compared with a voltage proportional to the
input signal. The difference between them (error) triggers the
open or close thyristor circuit, via logic circuits, to drive the
actuator in the direction which will cancel the error. Valve
position is therefore automatically adjusted in proportion to
analogue signal. Unnecessarily frequent switching is prevented
by the Motion Inhibit feature.

The Folomatic can be configured to suit the following:

Analogue signals/ 0-5mA/1k ohm 0-5v/1 M ohm
input impedence: 0-10mA/500 ohm 0-10v/78 kohm

0-20mA/250 ohm 0-20V/52 kohm

Position corresponding Closed limit, or percentage Open
to low input signal: or Open limit.

Position corresponding Closed limit, or percentage Open
to high imput signal: or Open limit.

Deadband: 0-9.9% of travel between Open

and Closed limit positions.

Motion Inhibit time: 2-99 secs. between actuator

movements.

Action on loss of Stay-put or move to high signal
input signal: position or move to low signal

position. Available for minimum
set ‘low’ signal of 0.5mA.
Response on loss of signal will
occur if signal falls below 50% of
set ‘low’ signal.

Overall accuracy (actuator 0.5% of maximum signal with
mechanical output position/

dynamic braking and minimum

demand value): of 10 turns for full valve stroke,

assuming a deadband setting of
<0.2%.

CONNECTIONS

The analogue signal should be connected to terminals 26 (+ve)
and 27 (-ve). If no remote manual control is required, link
terminals 39 to 5 and 41 to 4. Terminal 39 is provided for
remote manual/auto selection. The remote control connections
for actuators to standard wiring diagrams are as follows:

CURRENT POSITION TRANSMITTER (CPT)

The CPT provides an internally powered electrically isolated 4­20mA analogue valve position feedback signal, which is
available at terminals 22 (+ve) and 23 (-ve). The maximum
external impedence that may be connected to the signal is 500
ohms. Repeatability is within ±1% and linearity ±2.5% of total
valve travel.

ALARM RELAYS

A set of three alarm relays can be provided with the following
functions:

Relay 1 ‘Battery low’ signal (Normally open contact

rated for 5A 250 volts AC, 30 volts DC).

Relay 2 ‘Thermostat tripped’ signal (change-over

contact rated for 30 Watts, 62.5VA, 110 Volts).

Relay 3 ‘Remote selected’ signal (contact as Relay 2)

The following optional facilities available on standard IQ
actuators are also available on IQM units.

Negative Switching (see publication E120E)
Interrupter Timer (see publication E120E)
Pakscan (see publication S000E)

IQM - OPTIONAL FACILITIES