Weidmuller G118 User Manual

Weidmuller Ltd.
10 Spy Court
Markham, ON L3R 5H6
Tel: [phone]
Fax: [phone]

Weidmuller Inc.
821 Southlake Blvd.
Richmond, VA 23236 U.S.A.
Tel: [phone]
Fax: [phone]

ISO 9001 Registered

Electronic Interface Modules

G118 Ultra SlimPak®

RTD Input, Field Configurable Limit Alarm

• field configurable via DIP switches for different input­output combinations

• provides relay contact closure(s) at a preset
RTD/resistance input level

• field configurable input ranges for platinum, nickel and
copper RTDs

• setpoints programmable HI or LO and failsafe or non­failsafe

• LED trip and input indicators

• flexible power supply accepts 9 to 30Vdc

• ASIC technology for high reliability

• CSA approved, UL recognized, CE marked

Description

Diagnostic LEDs

Output

Operation

Dynamic Deadband

The Ultra SlimPak G118 is a DIN rail mount, RTD input limit alarm with dual setpoints and two contact
closure outputs. The field configurable input and alarm functions offer flexible setpoint capability. There are
up to eight temperature ranges available for each RTD type to ensure accuracy and maximize setpoint
resolution. The G118 is configurable as a single or dual setpoint alarm, with HI or LO trips and failsafe or
non-failsafe operation. Also included are adjustable deadbands (1% to 5% of full scale input) for each
setpoint and a flexible DC power supply which accepts any voltage between 9 and 30Vdc.

The G118 is equipped with three front panel LEDs. The first is a dual function LED labeled IN (input). This
green LED indicates line power and input signal status. Active DC power is indicated by an illuminated LED.
If this LED is off, check DC power and wiring connection. If the input signal is more than 110% of full scale,
the LED will flash at 8 Hz. Below -10%, the flash rate is 4 Hz. Two red LEDs indicate the relay state for each
setpoint. An illuminated red LED indicates the tripped condition.

The G118 is equipped with two SPDT (form C) relays, rated at 120Vac or 28Vdc at 5 amperes. Each of
these relays is independently controlled by the field configurable setpoint and deadband.

The field configurable G118 limit alarm setpoints
can be configured for HI or LO, failsafe or non­failsafe operation. Each of the setpoints has a
respective HI or LO dead-band. In a tripped
condition, the setpoint is exceeded and the
appropriate red LED will illuminate. The trip will
reset only when the process falls below the HI
deadband or rises above the LO deadband (see
Figure 1). For proper deadband operation the HI
setpoint must always be set above the LO
setpoint. In failsafe operation, the relay is
energized when the process is below the HI
setpoint or above the LO setpoint (opposite for
non-failsafe). In the failsafe mode, a power failure
results in an alarm state output.

LSI circuitry in the G118 prevents false trips by repeatedly sampling the input. The input must remain beyond
the setpoint for 100 milliseconds, uninterrupted, to qualify as a valid trip condition. Likewise, the input must
fall outside the deadband and remain there for 100 milliseconds to return the alarm to an untripped
condition. This effectively results in a "dynamic deadband" - based on time- in addition to the normal
deadband.

Figure 1

Note: resistance
values for
Pt500(M) and
Pt1000(M) are 5
and 10 times the
resistance value
of Pt100(M),
respectively

Relay

Tabele 1: RTD input type switch
settings (SW2 - 1 through 6)

Tabele 2: Setpoint function switch
settings (SW1 - 5 through 8)

Table 3
Input range
switch settings
(SW-1 through 4)

Conta cts

(optional)

Figure 2: DC Inductive Loads

Relay

Conta cts

Figure 3: AC Inductive Loads

Power

+

-

Load

Diode

47 ohm

0.1uF

1/2W

Film

Power

Load

MOV

47 ohm

0.1uF

1/2W

Film

Unless otherwise specified, the factory presets the Model G118 as follows:
Input: Platinum (100M) Range: 0 to 250°C Output: Dual, SPDT
Trip: A:HI, B:LO Failsafe: No Deadband: A, B: 1.0%
The DC power input accepts any DC source between 9 and 30V; typically a 12V or 24Vdc source is used.
For other I/O ranges, refer to Tables 1 through 3 and reconfigure switches SW1 and SW2
for the desired input type, range and function.

Do not attempt to change any switch settings with power ap-plied. Severe damage will result!

Input

1. With DC power off, position input switches 1 through 6 on "SW2" for RTD type (see Table 1).

2. Set position 1 through position 4 of input range switch "SW1" for the desired RTD type and input
temperature range (Table 3).

3. Set position 5 and 6 of input range switch "SW1" to ON for a HI trip setpoint or OFF for a LO trip
setpoint (Figure 4).

4. Set position 7 of input range switch "SW1" to ON for non-failsafe operation or OFF for failsafe operation
(e.g. alarm trips upon power failure).

1. After configuring the DIP switches, connect the input to a calibrated RTD source or a resistance decade
box and apply power. See wiring diagram.
NOTE: To maximize thermal stability, final calibration should be performed in the operating installation,
allowing approximately 1 to 2 hours for warm up and thermal equilibrium of the system.

2. Setpoint Calibration: Before adjusting the setpoint, adjust deadband pot to its minimum (20 turns counter
clockwise). With the desired trip RTD resistance input applied, adjust setpoint pot until the relay trips. For
HI trip calibration, start with the set-point pot above the desired trip (20 turns clockwise). For LO trip
calibration, start with the setpoint pot below the desired trip (20 turns counter clockwise).

3. Deadband Calibration: Set dead-band pot to its minimum (20 turns counter clockwise). Adjust the
setpoint pot to desired trip. Adjust RTD resistance input until relay trips. Re-adjust deadband pots to 5%
(20 turns clockwise). Set RTD resistance input to desired deadband position. Slowly adjust deadband
(counter clockwise) until relay untrips.

When switching inductive loads, maximum relay life and transient EMI suppression is achieved using
external protection (see Figures 2 and 3). Place all protection devices directly across the load and
minimize all lead lengths. For AC inductive loads, place a properly rated MOV across the load in parallel with
a series RC snubber. Use a 0.01 to 0.1HF pulse film capacitor (foil polypropylene recommended) of
sufficient voltage, and a 47M, 1/2W carbon resistor. For DC inductive loads, place a diode across the load
(PRV>DC supply, 1N4006 recommended) with (+) to cathode and (-) to anode (the RC snubber is an
optional enhancement).

Configuration

WARNING:

Calibration

Relay Protection and EMI
Suppression

Figure 4
G118 input
range/function
selection (SW1)
Factory default
settings

Not Used

3

Not Used

Rated data
Input

Range

Maximum ratings
Field device excitation
Other input specification
Other input specification

Output

Range
Load
Burnout level
Zero / Span adjustment
Protection
Other output specification
Other output specification

Supply

Range
Consumption
Other supply specification

General

Accuracy
Linearity
Temperature coefficient (drift)
Transmission frequency
Response time. 90% span

Other general specification
Status LED
Isolation (# of ports)
Operating / Storage temperature
Housing (mounting)
Dimensions (Lx W x H)
Wire range (conductor size)
Insulation stripping length
Tightening torque
Approvals

Ordering data

Ultra SlimPak
Heat sink (width)
Shunt resistor

RTD temperature sensor, 3 wire

-200 to 850°C for Pt100/Pt500/Pt1000, -200 to 260°C for Cu10/Cu100

-80 to 320°C for Ni120, -200 to 240°C for NiFe604, DIP switch selectable
±5Vdc
<2mA for Pt100, Pt500, Pt1000, Ni120, Cu100 or NiFe604; <10mA for Cu10
leadwire resistance: 40% of base sensor resistance or 100M (whichever is less), maximum per lead.
leadwire effect: less than 1% of selected span over entire leadwire resistance range.
2 form C relays (2 SPDT), one set point per relay, gold flash/silver alloy
2 set points independently adjustable over 100% of the selected input span, HI or LO, failsafe or non-failsafe
maximum 5A at 120Vac, 2A at 240Vac, 5A at 28Vdc (resistive load), minimum 10HA at 10mV

deadband adjustable from 1% to 5% of span
external relay contact protection required for inductive load switching
Electrical life: 105operations at rated load
Mechanical life: 107operations no load
DC voltage
9 to 30Vdc, inverter isolated

1.5W typ., 2.5W max. (300mA inrush at 9Vdc).

0.2% of full scale

±0.05% of full scale/°C, max.

<250mS in normal mode, dynamic deadband: relay status will change when proper setpoint/process
condition exists for 100mS

input green (>110% of input: 8Hz, <-10% of input: 4Hz), 2 setpoint red (ON: tripped, OFF: safe)
1800V (3 port) between contacts, input and power

-15°C to 55°C / -25°C to 75°C
EG12 (TS32 and TS35)
90mm x 17.7mm x 112.7mm max.
22-12AWG (0.5-4.0mm2)
7mm

0.4-0.8Nm
CSA (file LR-42272), UL (file E99775), CE marked (EMC dir. 89/336/EEC, LV dir. 73/23/EEC)

Cat. No.
G118 (factory calibration: 0-250ºC (Pt 100), A-HI/B-LO, non-failsafe)
HS01-A (1.6mm) (conditionally required depending on installation, see heat sink data)

Note: G118-000X where X is the revision level. For 2 wire sensors: connect RTN and - externally

Specifications subject to change without notice. 99990014 - 8/98 Printed in Canada

RTD

RTD Return

RTD Input (+)

RTD Input (+)
RTD Return

TS32 RAIL

TS35 RAIL