Weidmuller G108 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

G108 Ultra SlimPak®

DC Input, Field Configurable Limit Alarm

n field configurable via DIP switches for

different input-output combinations

n provides relay contact closure(s) at a preset

DC input level

n field configurable input ranges 10mV to 200V,

1mA to 100mA

n setpoints programmable HI or LO and failsafe

or non failsafe

n LED trip and input indicators
n 24Vdc transducer excitation
n 9 to 30Vdc powered
n CSA approved, UL recognized, CE marked

Description

Diagnostic LEDs

Output

Operation

Dynamic Deadband

The Ultra SlimPak G108 is a DIN rail mount, DC voltage or current input, limit alarm with dual
setpoints and two contact closure outputs. The field configurable input and alarm functions offer
flexible setpoint capability. Input voltage spans from 10mV to 200V and input current spans from 1mA
to 100mA can be field configured. Bipolar inputs are also accepted.
The G108 is configurable as a single or dual setpoint alarm, HI or LO trips and failsafe or non-failsafe
operation. Also included are adjustable deadbands (0.25 to 5% of full scale input) for each setpoint, a
24Vdc voltage source (isolated from line power) for transducer excitation, and a flexible DC power supply
which accepts any voltage between 9 and 30Vdc.

The G108 is equipped with three front panel LEDs. The green LED is a dual function LED labelled INPUT.
This 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
above 110% full scale, the LED will flash at approximately 8Hz. Below 0%, the flash rate is 4Hz.
Two red LEDs indicate the relay state for each setpoint. An illuminated red LED indicates the tripped
condition.

The G108 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 G108 limit alarm setpoints can be configured for HI or LO, failsafe or non-failsafe
operation. Each of the setpoints has respective HI or LO deadband. 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 low 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 G108 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

Table 1: G108 Input range switch settings (SW1, 1 through 4) KEY z = ON

(optional)

47 ohm

1/2W

47 ohm

1/2W

Load

Load

Diode

MOV

0.1uF

0.1uF
Film

Film

Relay

Conta cts

Figure 2: DC Inductive Loads

Relay

Conta cts

Figure 3: AC Inductive Loads

Power

Power

-

Unless otherwise specified the factory presets the G108 as follows:
Input: Current Range: 0-20mA Output: Dual, SPDT
Trip: A:HI, B:LO Failsafe: No Deadband: A, B: 0.25%
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 table 1 and Figure 4. Reconfigure switches SW1 for the desired input
type, range and function.

Do not attempt to change any settings with power applied. Severe damage will result!

1. With DC power off, position 9 and 10 of SW1 for current or voltage (see Table 1).

2. Set position 1 through position 4 of input range switch “SW1” for the desired input range (see Table 1).

3. Set position 5 of input range switch “SW1" to ON for unipolar (e.g. zero based, 0-20mA) range or
OFF for bipolar (e.g. -100% offset, -20 to 20mA) range (see Figure 4).

4. Set position 6 and 7 of input range switch “SW1" to ON for a HI trip setpoint or OFF for a LO trip
setpoint (see Figure 4).

5. Set position 8 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 DC source and apply power. Refer
to the terminal 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: set deadband at its minimum (fully Counter Clockwise) before adjusting the setpoint. With the
desired trip voltage or current input applied, adjust setpoint until the relay trips. For HI trip calibration, start
with the setpoint above the desired trip. For LO trip calibration, start below the desired trip.

3. Deadband: Set deadband to its minimum (fully counter clockwise). Set the setpoint to desired trip.
Adjust voltage/current input until relay trips. Readjust deadband to 5% (fully Clockwise). Set
voltage/current input signal to desired deadband position. Slowly adjust deadband 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
G108 Input range/
function selection
(SW1), factory
default settings

Rated data
Input

Range
Impedance
Maximum ratings/type of protection
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 (Length x Width x Height)
Wire range (conductor size)
Insulation stripping length
Tightening torque
Approvals

Ordering data

Ultra SlimPak
Heat sink (width)
Shunt resistor

DC current or voltage
±1mA to ±100mA or ±10mVdc to ±200Vdc, DIP switch selectable
20M for current, >100kM for voltage
170mA, 60Vdc for current, 200Vrms for voltage / self resetting fuse
24Vdc @ 20mA typical

2 form C relays (2 SPDT), one set point per relay, gold flash / silver alloy contacts
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 24Vdc (resistive load), minimum 10HA at 10mV

deadband adjustable from 0.25% to 5% of span (span >50mV or >5mA) and from 1% to 5% of span
(span <50mV or <5mA)
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)

0.1% of full scale (span >50mV or >5mA), 0.2% of full scale (span <50mV or <5mA)

±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, <0% of input: 4Hz), 2 setpoint red (ON: tripped, OFF: safe)
1800V (3 port) between contacts, input and power
0°C to 55°C / -25°C to 70°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: input <75Vdc only)

Cat.No.
G108 (factory calibration: 0...20mA, A-HI/B-LO, non-failsafe)
HS01-A (1.6mm) (conditionally required depending on installation, see heat sink data)
C006 (0.1M, 1%, 5W for use with external DC current source)

Note: G108-000X where X is the revision level

Specifications subject to change without notice. 99990010 - 8/98 Printed in Canada

TS32 RAIL

TS35 RAIL